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JAVA Beginner's Video Tutorial

JAVA Beginner's Video Tutorial

Welcome to our "JAVA Basic Introductory Video Tutorial" Java language has become the mainstream development language in the current software development industry. This course will lead you to learn our JAVA in a simple and in-depth way and lead you into the wonderful world of JAVA

2982743 person learning
753 class hour
2022-04-15 update time
04 days05 Hours22 minutes25 seconds Total course duration
怪我咯
Gold lecturer
54 Course
39548 student
5.0 score

走同样的路,发现不同的人生

You will learn

"JAVA Beginner's Video Tutorial" will lead you to learn: 1. Be able to configure the Java development environment and use tools for program development 2. Master the use of basic syntax in Java 3. Master Java basic syntax and programming ideas 4. Proficient in using object-oriented programming ideas Then learn about exception handling, collection framework, strings, common classes, etc. in Java, and gradually learn to master advanced Java technologies.

JAVA Beginner's Video Tutorial

Section1 Overview and use of keywords
08 minutes02 seconds
Section2 Overview and composition rules for identifiers
08 minutes22 seconds
Section3 Common naming rules for identifiers
10 minutes43 seconds
Section4 Overview of annotations and their classification
09 minutes33 seconds
Section5 HelloWorld case added to annotated version
06 minutes31 seconds
Section6 The role of comments
06 minutes08 seconds
Section7 Overview and use of constants
09 minutes30 seconds
Section8 Overview of base systems and illustrations of binary, octal and hexadecimal systems
12 minutes17 seconds
Section9 Representation forms of different base data
06 minutes47 seconds
Section10 Conversion diagram from arbitrary base to decimal
10 minutes17 seconds
Section11 Exercises from arbitrary base to decimal
02 minutes49 seconds
Section12 Conversion diagram from decimal to arbitrary base
06 minutes52 seconds
Section13 Exercises from decimal to arbitrary base
03 minutes13 seconds
Section14 Fast base conversion method
11 minutes51 seconds
Section15 Explanation of the original code's complement
13 minutes57 seconds
Section16 Practice of inverting and complementing the original code
03 minutes02 seconds
Section17 Overview and format of variables
07 minutes25 seconds
Section18 Overview and classification of data types
08 minutes44 seconds
Section19 Define variables of different data types
09 minutes20 seconds
Section20 Things to note when using variables
10 minutes03 seconds
Section21 Data type conversion default conversion
07 minutes58 seconds
Section22 Illustration of variables of different data types participating in operations
07 minutes02 seconds
Section23 Data type conversion cast
05 minutes31 seconds
Section24 Questions about forced conversion
04 minutes15 seconds
Section25 What is the difference between adding variables and adding constants? Interview questions
09 minutes07 seconds
Section26 How to calculate the result after forced conversion of data overflow
08 minutes44 seconds
Section27 Character data participates in operations
04 minutes53 seconds
Section28 Strings participate in operations
03 minutes54 seconds
Chapter3 JAVA language basics (2)
Section1 Several minor issues added to data types
14 minutes50 seconds
Section2 Basic usage of arithmetic operators
09 minutes46 seconds
Section3 Usage of arithmetic operators ++ and --
11 minutes33 seconds
Section4 Exercises with arithmetic operators ++ and --
05 minutes40 seconds
Section5 Various uses of arithmetic operator +
03 minutes56 seconds
Section6 Basic usage of assignment operators
05 minutes37 seconds
Section7 Assignment operator interview questions
04 minutes12 seconds
Section8 Basic usage of comparison operators and their precautions
09 minutes11 seconds
Section9 Basic usage of logical operators
12 minutes52 seconds
Section10 The difference between logical operators && and &
07 minutes24 seconds
Section11 Basic usage of bit operators 1
11 minutes06 seconds
Section12 Characteristics of bitwise XOR operator
03 minutes04 seconds
Section13 Bit operations interview questions
09 minutes52 seconds
Section14 Basic usage of bit operators 2 and interview questions
13 minutes09 seconds
Section15 Basic usage of ternary operator
06 minutes59 seconds
Section16 Exercises with the ternary operator
10 minutes26 seconds
Section17 An explanation of the basic format of keyboard entry
07 minutes14 seconds
Section18 Keyboard entry exercise 1
06 minutes31 seconds
Section19 Keyboard entry exercise 2
04 minutes49 seconds
Section20 sequential structure statement
04 minutes44 seconds
Section21 Select structure if statement format 1
08 minutes08 seconds
Section22 Things to note when choosing a structure if statement
09 minutes02 seconds
Section23 Select structure if statement format 2
05 minutes16 seconds
Section24 Exercises for selecting structure if statement format 2
06 minutes03 seconds
Section25 Conversion problem between format 2 of if statement and ternary
08 minutes07 seconds
Section26 Select structure if statement format 3
16 minutes26 seconds
Section27 Exercises for selecting structure if statement format 3
06 minutes11 seconds
Section28 Exercises for selecting structure if statement format 3
12 minutes41 seconds
Section29 Nested use of selection structure if statements
04 minutes49 seconds
Chapter4 JAVA language basics (3)
Section1 The format and explanation of the select structure switch statement
08 minutes28 seconds
Section2 Basic use of the switch statement in the selection structure
09 minutes57 seconds
Section3 Things to note when choosing a structural switch statement
10 minutes39 seconds
Section4 Select structure switch statement exercise 1 to see the program writing results
01 minutes26 seconds
Section5 Select structure switch statement exercise 2 multiple choice questions
08 minutes25 seconds
Section6 Select structure switch statement exercise 3 expression is a string
04 minutes51 seconds
Section7 Respective usage scenarios of the selection structure switch and if statements
08 minutes28 seconds
Section8 Loop Structure Loop Statement Overview
04 minutes13 seconds
Section9 The format and basic use of the loop structure for statement
08 minutes43 seconds
Section10 Things to note about the loop structure for statement
01 minutes37 seconds
Section11 Exercise 1 of loop structure for statement to obtain data
04 minutes10 seconds
Section12 Exercise 2 Summing Thoughts of Loop Structure for Statement
07 minutes55 seconds
Section13 Exercise 3 of even sum of loop structure for statement
05 minutes00 seconds
Section14 Exercise 4 factorial of loop structure for statement
03 minutes23 seconds
Section15 Exercise 5 Narcissus of loop structure for statement
11 minutes40 seconds
Section16 Exercise 6 of improved version of palindrome number for loop structure for statement
03 minutes58 seconds
Section17 Exercise 7 Statistical Thoughts on Loop Structure for Statement
04 minutes40 seconds
Section18 Exercise 8 of the loop structure for statement while taking the remainder problem
05 minutes22 seconds
Section19 The format and basic use of the while statement in the loop structure
05 minutes49 seconds
Section20 Exercise 1 Summation Thoughts of Loop Structure While Statement
03 minutes59 seconds
Section21 Exercise 2 Statistical Thoughts on Loop Structure While Statement
04 minutes26 seconds
Section22 The difference between loop structure while statement and for statement
07 minutes25 seconds
Section23 Practice Everest of loop structure while statement
07 minutes44 seconds
Section24 The format and basic use of the loop structure do...while statement
05 minutes41 seconds
Section25 Differences between three types of loop statements in loop structures
03 minutes20 seconds
Section26 Loop structure loop precautions - infinite loop
05 minutes32 seconds
Section27 Loop structure loop nesting outputs stars in 4 rows and 5 columns
10 minutes55 seconds
Section28 Loop structure loop nesting output equilateral triangle
06 minutes31 seconds
Section29 Loop structure multiplication table
07 minutes33 seconds
Section30 Control jump statement break statement
11 minutes17 seconds
Section31 Control jump statement continue statement
05 minutes24 seconds
Section32 Control jump statement return statement
03 minutes44 seconds
Section33 The combination of while statement and break uses Xiaofang to save money
10 minutes18 seconds
Chapter5 JAVA language basics (4)
Section1 Method overview and format description
10 minutes18 seconds
Section2 Method definition summation case
06 minutes57 seconds
Section3 Method calls with clear return values
07 minutes31 seconds
Section4 Method call diagram
07 minutes00 seconds
Section5 Exercise 1 of the method to get the larger of two numbers
07 minutes02 seconds
Section6 Method Exercise 2 Compare two numbers for equality
05 minutes40 seconds
Section7 Method Exercise 3: Obtain the maximum value of three numbers
05 minutes56 seconds
Section8 Notes on methods
04 minutes27 seconds
Section9 Method call Definition and call of void type method
08 minutes37 seconds
Section10 Exercise 4 of the method outputs a star based on the number of rows and columns
03 minutes41 seconds
Section11 Method Exercise 5: Output the corresponding multiplication table based on keyboard input
03 minutes19 seconds
Section12 Overview and basic usage of method overloading
11 minutes00 seconds
Section13 Method overloading practice comparing data for equality
04 minutes40 seconds
Section14 Array overview and definition format instructions
09 minutes24 seconds
Section15 Initialization of arrays Dynamic initialization
12 minutes44 seconds
Section16 Memory allocation in Java and the difference between stack and heap
15 minutes13 seconds
Section17 Memory diagram of array 1 an array
08 minutes02 seconds
Section18 Array memory diagram 2 two arrays
09 minutes09 seconds
Section19 Array memory diagram 3 three arrays
14 minutes30 seconds
Section20 Initialization of arrays, static initialization and memory map
07 minutes17 seconds
Section21 Two common minor problems with array operations: out-of-bounds and null pointers
05 minutes17 seconds
Section22 Array operation 1 traversal
13 minutes31 seconds
Section23 Array operation 2 obtains the maximum value
11 minutes35 seconds
Section24 Array operations 3 reverse order
11 minutes29 seconds
Section25 Array operations 4 table lookup method
03 minutes52 seconds
Section26 Array operations 5 basic search
10 minutes39 seconds
Section27 Overview of two-dimensional arrays and explanation of format 1
15 minutes11 seconds
Section28 Memory diagram of two-dimensional array format 1
05 minutes28 seconds
Section29 Explanation of two-dimensional array format 2
07 minutes53 seconds
Section30 Memory diagram of two-dimensional array format 2
07 minutes47 seconds
Section31 Explanation of two-dimensional array format 3
06 minutes30 seconds
Section32 Memory diagram of two-dimensional array format 3
06 minutes28 seconds
Section33 Two-dimensional array exercise 1 traversal
10 minutes24 seconds
Section34 Two-dimensional array exercise 2 summation
05 minutes29 seconds
Section35 Two-dimensional array exercise 3 Yang Hui triangle
12 minutes17 seconds
Section36 Question 1: Parameter passing issues and illustrations in Java
15 minutes46 seconds
Section37 Thinking Question 2 Analysis of Encryption Issues
09 minutes16 seconds
Section38 Question 2 Implementation of the code for encryption issues
10 minutes43 seconds
Section39 Question 2: Code improvements for encryption issues
09 minutes30 seconds
Chapter6 JAVA language basics (5)
Section1 Introduction of ideas and overview of process-oriented ideas
04 minutes51 seconds
Section2 Overview of ideas and examples
15 minutes42 seconds
Section3 Elephant put into refrigerator case
13 minutes10 seconds
Section4 development, design and features
03 minutes12 seconds
Section5 Classes and Objects
08 minutes14 seconds
Section6 Overview of class definitions and analysis of student classes
05 minutes22 seconds
Section7 Definition of student class
04 minutes41 seconds
Section8 Definition of mobile phone category
03 minutes55 seconds
Section9 Student use
11 minutes13 seconds
Section10 Use of mobile phones
04 minutes21 seconds
Section11 The memory map of an object
13 minutes01 seconds
Section12 Memory map of two objects
14 minutes09 seconds
Section13 Memory map of three objects
11 minutes32 seconds
Section14 The difference between member variables and local variables
11 minutes21 seconds
Section15 How to call the method when the formal parameter is the class name
11 minutes00 seconds
Section16 Overview and applications of anonymous objects
11 minutes33 seconds
Section17 Package overview
18 minutes01 seconds
Section18 Encapsulation benefits and design principles
03 minutes07 seconds
Section19 Overview and characteristics of the private keyword
05 minutes25 seconds
Section20 Private application standard cases
08 minutes06 seconds
Section21 Overview and application of this keyword
09 minutes32 seconds
Section22 Memory diagram of this keyword
13 minutes00 seconds
Section23 Standard mobile phone code and its testing
05 minutes36 seconds
Section24 Constructor method overview and format
06 minutes40 seconds
Section25 (Overloading and precautions of constructor methods
12 minutes06 seconds
Section26 Classification and use of member methods
06 minutes49 seconds
Section27 Code and tests for a standard student class
08 minutes51 seconds
Section28 A standard mobile phone code and test
06 minutes40 seconds
Section29 What is done to create the object
10 minutes06 seconds
Section30 When to define member variables
09 minutes43 seconds
Section31 Rectangle case exercise
09 minutes44 seconds
Chapter7 JAVA object-oriented (1)
Section1 Employee case exercises
10 minutes12 seconds
Section2 Implement addition, subtraction, multiplication and division by yourself and test it
05 minutes56 seconds
Section3 Introduction of static keyword
10 minutes21 seconds
Section4 Characteristics of static keyword
08 minutes50 seconds
Section5 static memory diagram
16 minutes04 seconds
Section6 Precautions for static
08 minutes47 seconds
Section7 The difference between static variables and member variables
01 minutes40 seconds
Section8 Detailed explanation of the format of the main method
07 minutes50 seconds
Section9 Use static in tool classes
11 minutes16 seconds
Section10 Improvement of tools
06 minutes30 seconds
Section11 Instructions making process
13 minutes05 seconds
Section12 Use of tools and instructions
07 minutes00 seconds
Section13 How to use the help documentation provided by JDK
13 minutes07 seconds
Section14 Learn the random number function of Math class through JDK help documentation
08 minutes48 seconds
Section15 Guess the number game case
09 minutes30 seconds
Section16 Overview and classification of code blocks
14 minutes19 seconds
Section17 Code block to see program writing results
06 minutes52 seconds
Section18 Introduction and overview of inheritance
07 minutes45 seconds
Section19 Inheritance cases and benefits of inheritance
07 minutes09 seconds
Section20 Disadvantages of inheritance
03 minutes09 seconds
Section21 Inheritance characteristics of classes in Java
06 minutes48 seconds
Section22 Note on implementation of inheritance and when to use inheritance
12 minutes10 seconds
Section23 Relationship between member variables in inheritance
08 minutes09 seconds
Section24 The difference and application of this and super
07 minutes18 seconds
Section25 The relationship between constructors and methods in inheritance
07 minutes43 seconds
Section26 Things to note about constructors in inheritance
09 minutes42 seconds
Section27 Interview questions in inheritance 1
03 minutes48 seconds
Section28 Interview questions 2 in inheritance
04 minutes01 seconds
Section29 Interview questions 3 in inheritance
08 minutes18 seconds
Section30 Member method relationship in inheritance
04 minutes44 seconds
Section31 Application of method overriding
11 minutes46 seconds
Section32 Things to note about method overriding
07 minutes21 seconds
Section33 Two interview questions
04 minutes29 seconds
Section34 Using student and teacher cases before inheritance
05 minutes54 seconds
Section35 Student and teacher cases using inheritance
07 minutes14 seconds
Section36 Cat and dog case analysis
05 minutes09 seconds
Section37 Cat and dog case implementation and testing
09 minutes43 seconds
Chapter8 JAVA object-oriented (2)
Section1 final keyword introduction
05 minutes41 seconds
Section2 The final keyword modifies the characteristics of classes, methods and variables
06 minutes08 seconds
Section3 The final keyword modifies local variables
08 minutes43 seconds
Section4 Initialization timing of final modified variables
05 minutes25 seconds
Section5 Overview and prerequisites for polymorphism
05 minutes06 seconds
Section6 Provide code reflection according to the premise of polymorphism
03 minutes41 seconds
Section7 Member access characteristics in polymorphism
09 minutes07 seconds
Section8 Advantages of polymorphism
20 minutes21 seconds
Section9 Disadvantages of polymorphism
02 minutes51 seconds
Section10 Upcasting and downcasting in polymorphism
07 minutes21 seconds
Section11 The case of Confucius pretending to be a father explains the phenomenon of polymorphism
09 minutes33 seconds
Section12 Memory diagram in polymorphic inheritance
09 minutes32 seconds
Section13 Memory diagram of object changes in polymorphism
13 minutes11 seconds
Section14 Cat and dog case polymorphic version
06 minutes14 seconds
Section15 Cases of Northerners and Southerners
07 minutes16 seconds
Section16 Polymorphic exercises to see program writing results
05 minutes52 seconds
Section17 Introduction of abstract classes
02 minutes44 seconds
Section18 Characteristics of abstract classes
13 minutes21 seconds
Section19 Characteristics of members of abstract classes
07 minutes54 seconds
Section20 Abstract class practice cat and dog case
11 minutes46 seconds
Section21 Abstract practice teacher case
07 minutes46 seconds
Section22 Abstract practice student case
09 minutes58 seconds
Section23 Abstract class practice employee case
17 minutes16 seconds
Section24 Small problems in abstract classes
06 minutes19 seconds
Section25 Introduction of interface
02 minutes39 seconds
Section26 Interface characteristics
09 minutes19 seconds
Section27 Interface member characteristics
12 minutes55 seconds
Section28 The relationship between classes, classes and interfaces, and interfaces
08 minutes08 seconds
Section29 The difference between abstract class and interface
04 minutes27 seconds
Section30 Cat and dog case adding high jump function analysis
04 minutes20 seconds
Section31 Cat and dog case adds high jump function code implementation
08 minutes45 seconds
Section32 Teacher and student cases add smoking function analysis and code implementation
09 minutes50 seconds
Chapter9 JAVA object-oriented (3)
Section1 Athletes and coaches case studies
10 minutes13 seconds
Section2 Athletes and coaches case implementation
14 minutes35 seconds
Section3 Athletes and Coaches Case Tests
05 minutes52 seconds
Section4 Class name as formal parameter
07 minutes50 seconds
Section5 Abstract class name as formal parameter
05 minutes56 seconds
Section6 Interface name as formal parameter
05 minutes31 seconds
Section7 Class name as return value type
05 minutes41 seconds
Section8 Abstract class name as return value type
03 minutes59 seconds
Section9 Interface name as return value type
03 minutes23 seconds
Section10 chain programming
04 minutes44 seconds
Section11 Overview and function of package keyword
05 minutes39 seconds
Section12 Package definition and precautions
02 minutes51 seconds
Section13 Compile and run packaged classes
06 minutes26 seconds
Section14 Access between classes in different packages
07 minutes28 seconds
Section15 Overview and use of the import keyword
04 minutes12 seconds
Section16 Testing of four permission modifiers
13 minutes34 seconds
Section17 Common modifiers used by classes and their components
12 minutes15 seconds
Section18 Internal class overview and access characteristics
05 minutes13 seconds
Section19 Internal class classification and direct use of member internal classes
07 minutes50 seconds
Section20 Common modifiers and applications of member inner classes
14 minutes36 seconds
Section21 Interview questions for member internal classes
04 minutes53 seconds
Section22 Problem with local inner class accessing local variables
11 minutes31 seconds
Section23 Format and understanding of anonymous inner classes
05 minutes50 seconds
Section24 Anonymous inner class method call
04 minutes31 seconds
Section25 Application of anonymous inner classes in development
06 minutes38 seconds
Section26 Anonymous inner class interview questions
06 minutes32 seconds
Chapter10 JAVA object-oriented (4)
Section1 Introduction to common development tools
05 minutes32 seconds
Section2 Overview of Eclipse and MyEclipse
08 minutes19 seconds
Section3 Download, install and uninstall Eclipse
06 minutes58 seconds
Section4 How to write a HelloWorld case in Eclipse
15 minutes45 seconds
Section5 How to compile and run programs in Eclipse
04 minutes00 seconds
Section6 Eclipse Chinese translation and grammar checking tips
08 minutes09 seconds
Section7 Eclipse windows and views overview
09 minutes01 seconds
Section8 Basic configuration of Eclipse workspace
12 minutes09 seconds
Section9 How to use content auxiliary keys in Eclipse
05 minutes32 seconds
Section10 How to use shortcut keys in Eclipse
13 minutes44 seconds
Section11 Automatic generation of constructor and get_set methods in Eclipse
06 minutes07 seconds
Section12 Simplification of inheriting abstract classes or implementing interfaces in Eclipse
05 minutes02 seconds
Section13 How to write a standard student class and its test in Eclipse
04 minutes35 seconds
Section14 Write high jump interface abstract animal class and concrete animal subclass in Eclipse
05 minutes42 seconds
Section15 How to generate a jar package in Eclipse and import it into a new project
05 minutes51 seconds
Section16 How to create help documents and use jar packages in Eclipse
05 minutes44 seconds
Section17 How to delete projects and import projects in Eclipse
04 minutes06 seconds
Section18 Small issues to pay attention to when importing projects into Eclipse
04 minutes51 seconds
Section19 Things to note when receiving projects during Eclipse development
03 minutes04 seconds
Section20 Basic use of debug in Eclipse
14 minutes52 seconds
Section21 Eclipse looks at parameter passing issues in Java
07 minutes51 seconds
Section22 API overview
03 minutes25 seconds
Section23 Learn the similarities and differences between Chinese and programming languages
07 minutes28 seconds
Section24 Overview of Object class
03 minutes34 seconds
Section25 hashCode() method of Object class
04 minutes49 seconds
Section26 getClass() method of Object class
04 minutes07 seconds
Section27 toString() method of Object class
13 minutes04 seconds
Section28 equals() method of Object class
13 minutes19 seconds
Section29 Code optimization of equals() method of Object class
11 minutes20 seconds
Section30 finalize() method and clone() method of Object class
11 minutes38 seconds
Chapter11 JAVA development tools
Section1 Scanner overview and construction method principles
09 minutes51 seconds
Section2 Explanation of hasNextXxx() and nextXxx() methods of Scanner class
06 minutes22 seconds
Section3 Scanner to obtain data minor problems and solutions
11 minutes02 seconds
Section4 Overview of the String class
05 minutes08 seconds
Section5 String class constructor
13 minutes14 seconds
Section6 Characteristics of String cannot be changed once assigned
07 minutes48 seconds
Section7 The difference between String literal objects and objects created by constructors
06 minutes55 seconds
Section8 String interview questions look at the program writing results
05 minutes13 seconds
Section9 Judgment function of String class
12 minutes09 seconds
Section10 Simulated user login case
08 minutes17 seconds
Section11 Breakpoint to view simulated user login case
04 minutes10 seconds
Section12 The enhanced version of the simulated user login case joins the guessing game
05 minutes37 seconds
Section13 Breakpoint view simulated user login case enhanced version joins the guessing game
04 minutes28 seconds
Section14 Get function of String class
13 minutes26 seconds
Section15 String traversal
04 minutes18 seconds
Section16 Cases of counting the number of uppercase, lowercase and numeric characters
08 minutes43 seconds
Section17 Breakpoint to view statistics on the number of uppercase, lowercase and numeric characters
02 minutes50 seconds
Section18 Conversion function of String class
12 minutes04 seconds
Section19 Convert the first letter of the string to uppercase and the rest to lowercase
05 minutes18 seconds
Section20 Other functions of String class
07 minutes01 seconds
Section21 Source code analysis of compareTo() method of String class
10 minutes26 seconds
Section22 A case of concatenating int arrays into strings
05 minutes28 seconds
Section23 An improved version of the case of concatenating int arrays into strings
02 minutes45 seconds
Section24 String reversal case
07 minutes38 seconds
Section25 Illustration of case ideas for finding the number of occurrences of a small string in a large string
09 minutes18 seconds
Section26 Case code implementation of finding the number of occurrences of a small string in a large string
07 minutes03 seconds
Section27 Find the number of occurrences of a small string in a large string case code optimization
02 minutes38 seconds
Section28 Breakpoint to view the case of finding the number of occurrences of a small string in a large string
03 minutes53 seconds
Section29 Overview of StringBuffer
12 minutes13 seconds
Section30 Constructor method of StringBuffer class
09 minutes22 seconds
Section31 Added functionality to StringBuffer
09 minutes03 seconds
Section32 StringBuffer deletion function
06 minutes42 seconds
Section33 StringBuffer replacement function
03 minutes13 seconds
Chapter12 JAVA common objects (1)
Section1 StringBuffer reverse function
02 minutes26 seconds
Section2 StringBuffer interception function
04 minutes08 seconds
Section3 Conversion between StringBuffer and String
07 minutes18 seconds
Section4 Example of concatenating arrays into strings in a specified format
05 minutes17 seconds
Section5 String reversal function example
05 minutes25 seconds
Section6 Determine whether a string is symmetrical case
07 minutes17 seconds
Section7 Two small interview questions about StringBuffer
06 minutes08 seconds
Section8 String and StringBuffer are passed as parameters respectively
09 minutes48 seconds
Section9 Illustration of the principle of advanced bubble sorting of arrays
14 minutes14 seconds
Section10 Array advanced bubble sort code implementation
12 minutes15 seconds
Section11 Illustration of the principle of advanced selection sorting of arrays
12 minutes55 seconds
Section12 Array advanced selection sort code implementation
08 minutes17 seconds
Section13 Sorting characters in a string case
04 minutes32 seconds
Section14 Illustration of the principle of advanced binary search in arrays
11 minutes16 seconds
Section15 Array advanced binary search code implementation
07 minutes22 seconds
Section16 Things to note when using binary search
03 minutes01 seconds
Section17 Overview and use of Arrays tool class
07 minutes37 seconds
Section18 Source code analysis of Arrays tool class
14 minutes20 seconds
Section19 Introduction of basic type wrapper classes
08 minutes28 seconds
Section20 Integer constructor
04 minutes03 seconds
Section21 Conversion between String and int types
09 minutes09 seconds
Section22 Operation of base conversion in Integer
09 minutes14 seconds
Section23 New features of JDK5: automatic boxing and unboxing
08 minutes47 seconds
Section24 Interview questions about direct assignment of Integer
08 minutes51 seconds
Section25 Overview of Character
03 minutes17 seconds
Section26 Explanation of common methods of Character
04 minutes18 seconds
Section27 Count the number of uppercase, lowercase and number occurrences in a string
05 minutes51 seconds
Section28 How to verify a QQ number case
09 minutes30 seconds
Section29 Overview and basic use of regular expressions
04 minutes28 seconds
Section30 Regular expression composition rules
13 minutes14 seconds
Section31 Regular expression judgment function
07 minutes35 seconds
Section32 Verification email case
07 minutes47 seconds
Section33 Regular expression split function
08 minutes28 seconds
Chapter13 JAVA common objects (2)
Section1 A small exercise in splitting functions
05 minutes16 seconds
Section2 Sorting numbers in a string case
06 minutes40 seconds
Section3 Regular expression replacement function
06 minutes02 seconds
Section4 Overview of Patterns and Matchers
06 minutes07 seconds
Section5 Regular expression acquisition function
09 minutes37 seconds
Section6 Math class overview and method usage
17 minutes10 seconds
Section7 How to get random number cases in any range
07 minutes49 seconds
Section8 Overview and method usage of Random class
08 minutes54 seconds
Section9 An explanation of the garbage collection method gc() in the System class
09 minutes11 seconds
Section10 Explanation of exit() and currentTimeMillis() in System class
09 minutes07 seconds
Section11 Explanation of arraycopy() in System class
06 minutes05 seconds
Section12 Overview and construction method of BigInteger
05 minutes20 seconds
Section13 The use of addition, subtraction, multiplication and division of BigInteger
04 minutes20 seconds
Section14 Introduction and overview of BigDecimal
06 minutes53 seconds
Section15 Use of addition, subtraction, multiplication and division of BigDecimal
07 minutes49 seconds
Section16 Overview and construction method of Date
06 minutes48 seconds
Section17 Conversion between date and milliseconds in Date class
03 minutes33 seconds
Section18 DateFormat implements mutual conversion between dates and strings
18 minutes27 seconds
Section19 Writing and testing cases for date tool classes
09 minutes37 seconds
Section20 How many days have you been in this world? Case Study
06 minutes47 seconds
Section21 Overview of the Calendar class and methods for obtaining calendar fields
11 minutes15 seconds
Section22 add() and set() methods of Calendar class
06 minutes08 seconds
Section23 How to get the number of days in February of any year
06 minutes32 seconds
Chapter14 JAVA common objects (3)
Section1 JAVA collection framework (1)
10 minutes41 seconds
Section2 Memory diagram for array of objects
08 minutes19 seconds
Section3 The origin of sets and their differences from arrays
07 minutes56 seconds
Section4 Collection inheritance system diagram
10 minutes26 seconds
Section5 Collection function overview
13 minutes06 seconds
Section6 Basic functional testing of Collection collection
11 minutes55 seconds
Section7 Advanced functional testing of Collections
09 minutes43 seconds
Section8 Collection traversal, set to array traversal
06 minutes16 seconds
Section9 Collection stores custom objects and iterates through cases
05 minutes35 seconds
Section10 Iterator traversal of collections
08 minutes55 seconds
Section11 Collection stores custom objects and iterates through cases
04 minutes59 seconds
Section12 Discussion on issues using iterators
05 minutes21 seconds
Section13 Illustration of steps for using collections
07 minutes12 seconds
Section14 The principle and source code analysis of iterators
14 minutes36 seconds
Section15 Collection stores strings and traverses
04 minutes12 seconds
Section16 Collection stores student objects and traverses
06 minutes49 seconds
Section17 List stores strings and traverses
02 minutes59 seconds
Section18 Characteristics of List collection
05 minutes51 seconds
Section19 List stores student objects and traverses
02 minutes52 seconds
Section20 Overview and testing of unique features of List collection
10 minutes42 seconds
Section21 Unique traversal function of List collection
04 minutes01 seconds
Section22 List stores custom objects and traverses
04 minutes00 seconds
Section23 Unique functions of ListIterator
10 minutes54 seconds
Section24 Causes and solutions of concurrent modification exceptions
09 minutes22 seconds
Section25 Data structures stack and queue
11 minutes05 seconds
Section26 Data structures arrays and linked lists
17 minutes20 seconds
Section27 Characteristics of the three subclasses of List
07 minutes41 seconds
Section28 ArrayList stores strings and traverses
05 minutes15 seconds
Section29 ArrayList stores custom objects and traverses
05 minutes15 seconds
Section30 Vector’s unique features
07 minutes26 seconds
Section31 Unique functions of LinkedList
06 minutes44 seconds
Section32 Remove duplicate string elements from the ArrayList collection Case 1
08 minutes29 seconds
Section33 Breakpoint view to remove duplicate elements case 1
03 minutes20 seconds
Section34 Remove duplicate string elements from the ArrayList collection Case 2
08 minutes54 seconds
Chapter15 JAVA collection framework (1)
Section1 Case of removing duplicate custom object elements from ArrayList collection
09 minutes46 seconds
Section2 Collection code to implement stack structure using LinkedList
04 minutes14 seconds
Section3 Use LinkedList to simulate a collection of stack data structures and merge test cases
06 minutes53 seconds
Section4 Generics Overview and Basic Usage
14 minutes59 seconds
Section5 ArrayList stores strings and traverses the generic version
03 minutes42 seconds
Section6 ArrayList stores custom objects and traverses the generic version
07 minutes48 seconds
Section7 Introducing generics through Object transformation issues
06 minutes04 seconds
Section8 Overview and use of generic classes
08 minutes42 seconds
Section9 Overview and use of generic methods
08 minutes51 seconds
Section10 Overview and use of generic interfaces
05 minutes47 seconds
Section11 Advanced generic wildcards
08 minutes04 seconds
Section12 Enhance the overview and use of for
10 minutes42 seconds
Section13 ArrayList stores strings and traverses the enhanced for version
02 minutes46 seconds
Section14 ArrayList stores custom objects and traverses the enhanced for version
06 minutes52 seconds
Section15 Overview and use of static imports
06 minutes05 seconds
Section16 Overview and use of variable parameters
09 minutes44 seconds
Section17 Use of the asList() method of the Arrays tool class
05 minutes36 seconds
Section18 Case illustration of collection nested storage and traversal elements
07 minutes28 seconds
Section19 Case code implementation of collection nested storage and traversal elements
08 minutes07 seconds
Section20 Generating 10 random numbers between 1 and 20 requires that the random numbers cannot be repeated.
06 minutes35 seconds
Section21 Case of inputting multiple data with the keyboard and outputting the maximum value on the console
09 minutes43 seconds
Section22 Source code analysis of toString() method of ArrayList collection
09 minutes57 seconds
Section23 User login registration case analysis illustration
09 minutes05 seconds
Section24 Detailed analysis of user login registration cases and implementation of subcontracting
09 minutes42 seconds
Section25 User login registration case implementation of user basic description class and user operation interface
05 minutes43 seconds
Section26 User login registration case specific implementation of user operation class
04 minutes47 seconds
Section27 Implementation of user test class for user login registration case
13 minutes35 seconds
Section28 User login registration case user test class small problem solving
04 minutes01 seconds
Section29 User login registration case join the guessing number game
08 minutes55 seconds
Section30 Console shopping management system function demonstration
13 minutes59 seconds
Section31 Set collection overview and characteristics
07 minutes22 seconds
Section32 HashSet stores strings and traverses
02 minutes58 seconds
Section33 Source code analysis of HashSet to ensure element uniqueness
20 minutes19 seconds
Chapter16 JAVA collection framework (2)
Section1 HashSet stores custom objects and traverses
06 minutes25 seconds
Section2 HashSet code implementation and illustration to ensure element uniqueness
26 minutes03 seconds
Section3 HashSet stores custom objects and iterates through exercises
08 minutes07 seconds
Section4 Overview and use of LinkedHashSet
03 minutes34 seconds
Section5 TreeSet stores elements of type Integer and traverses them
05 minutes46 seconds
Section6 Source code analysis of TreeSet to ensure element sorting
11 minutes21 seconds
Section7 The principles and diagrams of TreeSet to ensure element uniqueness and natural ordering
12 minutes28 seconds
Section8 TreeSet stores custom objects and traverses exercise 1
12 minutes26 seconds
Section9 TreeSet stores custom objects and traverses Exercise 2
06 minutes10 seconds
Section10 The principle and code implementation of TreeSet to ensure element uniqueness and comparator sorting
10 minutes05 seconds
Section11 Reinterpretation of the source code of TreeSet's add() method and summary of TreeSet's sorting of elements
06 minutes47 seconds
Section12 Generate 10 random numbers between 1-20 and require that the random numbers cannot be repeated. Simple version of the case
04 minutes05 seconds
Section13 Case study of inputting student information with the keyboard and sorting it by total score and then outputting it on the console
14 minutes43 seconds
Section14 Map collection overview and features
10 minutes34 seconds
Section15 Function overview of Map collection
08 minutes08 seconds
Section16 Basic functional testing of Map collection
12 minutes53 seconds
Section17 Map collection acquisition function test
04 minutes53 seconds
Section18 Map collection traversal to find the key value
07 minutes20 seconds
Section19 Traversing the Map collection to find the key and value of the key-value pair object
07 minutes19 seconds
Section20 Comparison of two methods of Map collection traversal
11 minutes06 seconds
Section21 A case where the HashMap collection key is Stirng and the value is String
07 minutes36 seconds
Section22 A case where the HashMap collection key is an Integer and the value is a String
05 minutes35 seconds
Section23 The case where the HashMap collection key is String and the value is Student
05 minutes28 seconds
Section24 The case where the HashMap collection key is Student and the value is String
06 minutes04 seconds
Section25 Overview and use of LinkedHashMap
03 minutes58 seconds
Section26 TreeMap collection key is a String value is a case of String
04 minutes13 seconds
Section27 The case where the TreeMap collection key is Student and the value is String
07 minutes05 seconds
Section28 Case illustration of counting the number of occurrences of each character in a string
10 minutes32 seconds
Section29 Case code implementation for counting the number of occurrences of each character in a string
07 minutes51 seconds
Section30 Breakpoint to view statistics of the number of occurrences of each character in a string
06 minutes02 seconds
Section31 Case of HashMap collection nested HashMap collection
11 minutes27 seconds
Section32 Case of HashMap collection nested ArrayList collection
04 minutes38 seconds
Section33 Case of ArrayList collection nested HashMap collection
03 minutes56 seconds
Chapter17 JAVA collection framework (3)
Section1 Overview of IO streaming technology
13 minutes25 seconds
Section2 Overview and classification of exceptions
15 minutes27 seconds
Section3 How the JVM handles exceptions by default
05 minutes01 seconds
Section4 Handling exceptions using try...catch 1
09 minutes06 seconds
Section5 Handling exceptions using try...catch 2
15 minutes12 seconds
Section6 JDK7’s handling solution for multiple exceptions
05 minutes12 seconds
Section7 The difference between compile-time exceptions and run-time exceptions
07 minutes21 seconds
Section8 Several common methods of Throwable
10 minutes54 seconds
Section9 Handling exceptions using throws
09 minutes15 seconds
Section10 Overview of throw and the difference from throws
08 minutes01 seconds
Section11 How to handle exceptions?
02 minutes26 seconds
Section12 Characteristics and functions of finally keyword
08 minutes13 seconds
Section13 Interview questions: The difference between final, finally and finalize
05 minutes39 seconds
Section14 Interview question: If there is return before finally
07 minutes04 seconds
Section15 An overview of variations in exception handling and custom exceptions
05 minutes43 seconds
Section16 Implementation and testing of custom exceptions
09 minutes35 seconds
Section17 Unusual precautions
07 minutes03 seconds
Section18 Overview and construction method of File class
08 minutes56 seconds
Section19 File class creation function
16 minutes14 seconds
Section20 Delete function of File class
10 minutes12 seconds
Section21 Renaming function of File class
05 minutes05 seconds
Section22 Judgment function of File class
04 minutes13 seconds
Section23 File class acquisition function
05 minutes39 seconds
Section24 Advanced acquisition functions of File class
04 minutes44 seconds
Section25 Example of outputting the file name with the specified suffix in the specified directory
04 minutes04 seconds
Section26 File filter improvement case for outputting file names with specified suffixes in specified directories
09 minutes16 seconds
Section27 Source code of list() method with file name filter
04 minutes13 seconds
Section28 Batch modification of file names case
13 minutes32 seconds
Section29 Recursion overview and considerations
16 minutes04 seconds
Section30 Ideas and illustrations of recursive problem solving
11 minutes10 seconds
Section31 Code implementation and memory diagram for recursively finding factorial
11 minutes26 seconds
Section32 Breakpoint to view the execution process of recursive factorial calculation
02 minutes03 seconds
Section33 Immortal Rabbit Problem Case
14 minutes01 seconds
Chapter19 JAVA IO stream (1)
Section1 Example of recursively outputting the absolute paths of all java files in a specified directory
07 minutes30 seconds
Section2 Recursively delete directory with content case
06 minutes39 seconds
Section3 Breakpoint to view the execution process of deleting a directory with content
05 minutes14 seconds
Section4 Overview and classification of IO flows
10 minutes23 seconds
Section5 Overview of IO stream base class and a simple requirements analysis
06 minutes11 seconds
Section6 Constructor of FileOutputStream
08 minutes53 seconds
Section7 FileOutputStream writes data
09 minutes56 seconds
Section8 Three write() methods of FileOutputStream
06 minutes43 seconds
Section9 FileOutputStream writes data to implement line breaks and append writing
10 minutes07 seconds
Section10 FileOutputStream writes data and adds exception handling
07 minutes45 seconds
Section11 FileInputStream reads data
12 minutes34 seconds
Section12 Byte stream copy text file case 1
08 minutes26 seconds
Section13 How does the computer recognize and concatenate two bytes into Chinese?
03 minutes36 seconds
Section14 Byte stream copy text file case 2
02 minutes45 seconds
Section15 Byte stream copy picture case
02 minutes57 seconds
Section16 Byte stream copy video case 1
04 minutes40 seconds
Section17 FileInputStream reads data one byte array at a time
17 minutes58 seconds
Section18 Comparison of two ways to read data using FileInputStream
07 minutes54 seconds
Section19 Byte stream copy text file case 3
03 minutes37 seconds
Section20 Byte stream copy video case 2
02 minutes48 seconds
Section21 BufferedOutputStream writes data
09 minutes12 seconds
Section22 BufferedInputStream reads data
04 minutes15 seconds
Section23 Four ways of byte stream copying MP4 and testing efficiency
10 minutes44 seconds
Section24 Reasons and formats for the occurrence of conversion streams
07 minutes16 seconds
Section25 Overview of coding tables and common coding tables
15 minutes02 seconds
Section26 Encoding and decoding issues in String class
14 minutes09 seconds
Section27 Use of conversion stream OutputStreamWriter
08 minutes59 seconds
Section28 Use of conversion stream InputStreamReader
05 minutes13 seconds
Section29 5 ways to write data in character streams
12 minutes20 seconds
Section30 Two ways to read data from character streams
03 minutes42 seconds
Section31 Character stream copy text file case 1
05 minutes48 seconds
Section32 Character stream copy text file case 2
08 minutes41 seconds
Section33 Character stream copy text file case 3
03 minutes29 seconds
Chapter20 JAVA IO stream (2)
Section1 The use of character buffer output stream BufferedWriter
05 minutes05 seconds
Section2 The use of character buffer input stream BufferedReader
02 minutes59 seconds
Section3 Character buffer stream copy text file case 1
03 minutes22 seconds
Section4 Special features of character buffer streams
08 minutes07 seconds
Section5 Character buffer stream copy text file case 2
02 minutes51 seconds
Section6 IO flow summary diagram
08 minutes50 seconds
Section7 5 ways to copy text files
09 minutes36 seconds
Section8 4 ways to copy pictures
10 minutes38 seconds
Section9 Example of storing data in a collection into a text file
04 minutes33 seconds
Section10 Store data in text files into collections case
03 minutes58 seconds
Section11 Randomly obtain name cases from text files
03 minutes34 seconds
Section12 Copy single-level folder case
08 minutes32 seconds
Section13 Copy the file with the specified suffix in the specified directory and modify the name case
12 minutes32 seconds
Section14 Breakpoint to view the execution process of copying files and modifying the suffix name case
06 minutes49 seconds
Section15 Copy multi-level folder case
10 minutes26 seconds
Section16 Case study of inputting student information using the keyboard, sorting it by total score and writing it into a text file
13 minutes41 seconds
Section17 Example of sorting strings in one file and then writing them to another file
04 minutes47 seconds
Section18 Custom class simulates BufferedReader's readLine() function case
18 minutes43 seconds
Section19 Use cases for LineNumberReader
04 minutes24 seconds
Section20 Custom class simulates LineNumberReader's function case of getting line numbers
09 minutes07 seconds
Section21 Knowledge review of login registration cases
09 minutes05 seconds
Section22 Login registration case IO version implementation
18 minutes06 seconds
Section23 Overview and explanation of data input and output flows
09 minutes20 seconds
Section24 Overview and explanation of memory operation flow
10 minutes53 seconds
Section25 Overview and features of print streams
07 minutes44 seconds
Section26 PrintWriter is used as a subclass of Writer
02 minutes21 seconds
Section27 PrintWriter implements automatic refresh and line wrapping
07 minutes27 seconds
Section28 Print flow improvement copy text file case
06 minutes17 seconds
Section29 Overview of standard input and output streams and the nature of output statements
06 minutes27 seconds
Section30 Three ways to achieve keyboard entry
09 minutes50 seconds
Chapter21 JAVA IO stream (3)
Section1 The introduction of multi-threaded programs
09 minutes24 seconds
Section2 Process overview and the significance of multiple processes
15 minutes36 seconds
Section3 Overview of threads and the significance of multithreading
08 minutes02 seconds
Section4 Examples of multithreading and the difference between parallelism and concurrency
05 minutes08 seconds
Section5 Is the running principle of Java program and the startup of JVM multi-threaded?
05 minutes48 seconds
Section6 How to implement multi-threading and multi-threading method 1 ideas
06 minutes29 seconds
Section7 Code implementation of multi-threading mode 1
14 minutes28 seconds
Section8 Get and set thread object name
17 minutes28 seconds
Section9 Thread scheduling and getting and setting thread priority
12 minutes44 seconds
Section10 Thread control sleeping thread
05 minutes36 seconds
Section11 Thread control - joining thread
04 minutes12 seconds
Section12 Thread control courtesy thread
04 minutes09 seconds
Section13 Thread control daemon thread
07 minutes51 seconds
Section14 Thread control interrupt thread
07 minutes55 seconds
Section15 Thread life cycle diagram
09 minutes39 seconds
Section16 The idea and code implementation of multi-threading mode 2
07 minutes29 seconds
Section17 Graphical comparison and differences between two methods of multithreading
06 minutes59 seconds
Section18 Case Study of Selling Movie Tickets by Inheriting Thread Class
10 minutes44 seconds
Section19 Case Study of Selling Movie Tickets by Implementing Runnable Interface
04 minutes20 seconds
Section20 Analysis of the reasons why there are same tickets and negative tickets when buying movie tickets
13 minutes04 seconds
Section21 Analysis of the causes of thread safety issues
05 minutes30 seconds
Section22 Synchronized code blocks solve thread safety issues
07 minutes58 seconds
Section23 Explanation of synchronized code blocks solving thread safety issues
05 minutes25 seconds
Section24 Characteristics, benefits and drawbacks of synchronization
04 minutes22 seconds
Section25 Fast locks for synchronized code and problems with application of synchronization methods and locks
12 minutes33 seconds
Section26 Review of previous thread-safe classes
04 minutes27 seconds
Section27 Overview and use of Lock after JDK5
13 minutes02 seconds
Section28 Overview and use of deadlock problems
13 minutes22 seconds
Section29 Producer-consumer problem description diagram
06 minutes26 seconds
Chapter23 JAVA multi-threading (1)
Section1 GUI overview and the difference between GUI and CLI
03 minutes55 seconds
Section2 The difference between java.awt and javax.swing packages
03 minutes16 seconds
Section3 Component inheritance diagram in GUI
08 minutes25 seconds
Section4 HelloWorld form case
10 minutes19 seconds
Section5 Optimize HelloWorld form case code
07 minutes52 seconds
Section6 Overview and examples of event listening mechanism principles
10 minutes13 seconds
Section7 Form close case
04 minutes58 seconds
Section8 Adapter design pattern explained
09 minutes40 seconds
Section9 Adapter class improves form closing case
02 minutes07 seconds
Section10 Add a button to the form and add an event case to the button
17 minutes37 seconds
Section11 Transfer text box value to text field case
12 minutes09 seconds
Section12 Change the background color by moving the mouse over the button case
11 minutes12 seconds
Section13 How to control that only numeric characters can be entered in the text box
12 minutes35 seconds
Section14 First level menu case
08 minutes47 seconds
Section15 Multi-level menu case
08 minutes33 seconds
Section16 Overview and use of Netbeans
09 minutes37 seconds
Section17 Simulation of four arithmetic operations cases
18 minutes13 seconds
Section18 Modify the icon code of the form
07 minutes53 seconds
Section19 How to set the code to center the form
06 minutes44 seconds
Section20 How to modify the code of the form's skin
11 minutes02 seconds
Section21 Add checksum prompts to four arithmetic operations cases
09 minutes23 seconds
Section22 Review of the package structure of user login registration
03 minutes51 seconds
Section23 Implementation of basic functions of user login and registration
08 minutes23 seconds
Section24 User login and registration interface implementation
04 minutes53 seconds
Section25 User login and registration interface jumps
05 minutes32 seconds
Section26 The final version of user login registration
12 minutes42 seconds
Section27 User login registration to join four arithmetic operations cases
10 minutes36 seconds
Chapter26 JAVA GUI
Section1 Network Programming Overview
04 minutes19 seconds
Section2 Network model overview and illustration
13 minutes08 seconds
Section3 Overview of the three elements of network programming
06 minutes31 seconds
Section4 Overview of IP in the Three Elements of Network Programming 1
15 minutes15 seconds
Section5 IP Overview of Three Elements of Network Programming 2
05 minutes34 seconds
Section6 Overview and use of the InetAddress class
08 minutes06 seconds
Section7 Ports of the three elements of network programming
03 minutes46 seconds
Section8 Protocols of the three elements of network programming
07 minutes03 seconds
Section9 Socket communication principle diagram
04 minutes39 seconds
Section10 UDP protocol sends data
11 minutes09 seconds
Section11 UDP protocol receives data
09 minutes38 seconds
Section12 Diagram of sending and receiving data using UDP protocol
03 minutes56 seconds
Section13 UDP protocol sending and receiving data code optimization
06 minutes03 seconds
Section14 The data on the sending end comes from the keyboard entry case
06 minutes26 seconds
Section15 DOS window demonstration simple chat applet
02 minutes51 seconds
Section16 Multi-threaded chat room program
06 minutes57 seconds
Section17 Demonstration of a GUI version of the chat program case
09 minutes23 seconds
Section18 TCP protocol sends data
07 minutes36 seconds
Section19 TCP protocol receives data
09 minutes30 seconds
Section20 Illustration of sending and receiving data using TCP protocol
09 minutes25 seconds
Section21 The server gives the client a feedback case
06 minutes08 seconds
Section22 Client keyboard input server console output
09 minutes37 seconds
Section23 Client keyboard input server writes to text file
06 minutes13 seconds
Section24 Client reads text file server console output
05 minutes01 seconds
Section25 TCP protocol upload text file
05 minutes05 seconds
Section26 TCP upload text file and give feedback
11 minutes31 seconds
Section27 TCP protocol uploads pictures and gives feedback
10 minutes04 seconds
Section28 Thoughts on uploading multiple clients to one server
04 minutes24 seconds
Section29 Multi-threading improves the case of multiple clients uploading files
07 minutes49 seconds
Chapter27 JAVA network programming
Chapter28 JAVA Reflection

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