computer overview

Computer Hardware and Software Overview

Software Development and Computer Languages ​​Overview

human-computer interaction

Keyboard function keys and shortcut keys

How to open a DOS console

Common DOS commands explained

Extended DOS commands

Java language overview

Java language cross-platform principle

Overview of JDK and JRE)

JDK download process diagram

JDK installation process diagram

Illustration of the uninstallation process of JDK

Introduction to Java development tools and introduction to JDK

Writing and running the first HelloWorld case

Summary of common problems in development

Why configure the path environment variable

How to configure Path environment variable 1

How to configure Path environment variable 2

The role of classpath and its configuration

The difference between path and classpath

Notepad++ installation and configuration

Use Notepad++ to develop programs and compile and run them

Overview and use of keywords

Overview and composition rules for identifiers

Common naming rules for identifiers

Overview of annotations and their classification

HelloWorld case added to annotated version

The role of comments

Overview and use of constants

Overview of base systems and illustrations of binary, octal and hexadecimal systems

Representation forms of different base data

Conversion diagram from arbitrary base to decimal

Exercises from arbitrary base to decimal

Conversion diagram from decimal to arbitrary base

Exercises from decimal to arbitrary base

Fast base conversion method

Explanation of the original code's complement

Practice of inverting and complementing the original code

Overview and format of variables

Overview and classification of data types

Define variables of different data types

Things to note when using variables

Data type conversion default conversion

Illustration of variables of different data types participating in operations

Data type conversion cast

Questions about forced conversion

What is the difference between adding variables and adding constants? Interview questions

How to calculate the result after forced conversion of data overflow

Character data participates in operations

Strings participate in operations

Several minor issues added to data types

Basic usage of arithmetic operators

Usage of arithmetic operators ++ and --

Exercises with arithmetic operators ++ and --

Various uses of arithmetic operator +

Basic usage of assignment operators

Assignment operator interview questions

Basic usage of comparison operators and their precautions

Basic usage of logical operators

The difference between logical operators && and &

Basic usage of bit operators 1

Characteristics of bitwise XOR operator

Bit operations interview questions

Basic usage of bit operators 2 and interview questions

Basic usage of ternary operator

Exercises with the ternary operator

An explanation of the basic format of keyboard entry

Keyboard entry exercise 1

Keyboard entry exercise 2

sequential structure statement

Select structure if statement format 1

Things to note when choosing a structure if statement

Select structure if statement format 2

Exercises for selecting structure if statement format 2

Conversion problem between format 2 of if statement and ternary

Select structure if statement format 3

Exercises for selecting structure if statement format 3

Exercises for selecting structure if statement format 3

Nested use of selection structure if statements

The format and explanation of the select structure switch statement

Basic use of the switch statement in the selection structure

Things to note when choosing a structural switch statement

Select structure switch statement exercise 1 to see the program writing results

Select structure switch statement exercise 2 multiple choice questions

Select structure switch statement exercise 3 expression is a string

Respective usage scenarios of the selection structure switch and if statements

Loop Structure Loop Statement Overview

The format and basic use of the loop structure for statement

Things to note about the loop structure for statement

Exercise 1 of loop structure for statement to obtain data

Exercise 2 Summing Thoughts of Loop Structure for Statement

Exercise 3 of even sum of loop structure for statement

Exercise 4 factorial of loop structure for statement

Exercise 5 Narcissus of loop structure for statement

Exercise 6 of improved version of palindrome number for loop structure for statement

Exercise 7 Statistical Thoughts on Loop Structure for Statement

Exercise 8 of the loop structure for statement while taking the remainder problem

The format and basic use of the while statement in the loop structure

Exercise 1 Summation Thoughts of Loop Structure While Statement

Exercise 2 Statistical Thoughts on Loop Structure While Statement

The difference between loop structure while statement and for statement

Practice Everest of loop structure while statement

The format and basic use of the loop structure do...while statement

Differences between three types of loop statements in loop structures

Loop structure loop precautions - infinite loop

Loop structure loop nesting outputs stars in 4 rows and 5 columns

Loop structure loop nesting output equilateral triangle

Loop structure multiplication table

Control jump statement break statement

Control jump statement continue statement

Control jump statement return statement

The combination of while statement and break uses Xiaofang to save money

Method overview and format description

Method definition summation case

Method calls with clear return values

Method call diagram

Exercise 1 of the method to get the larger of two numbers

Method Exercise 2 Compare two numbers for equality

Method Exercise 3: Obtain the maximum value of three numbers

Notes on methods

Method call Definition and call of void type method

Exercise 4 of the method outputs a star based on the number of rows and columns

Method Exercise 5: Output the corresponding multiplication table based on keyboard input

Overview and basic usage of method overloading

Method overloading practice comparing data for equality

Array overview and definition format instructions

Initialization of arrays Dynamic initialization

Memory allocation in Java and the difference between stack and heap

Memory diagram of array 1 an array

Array memory diagram 2 two arrays

Array memory diagram 3 three arrays

Initialization of arrays, static initialization and memory map

Two common minor problems with array operations: out-of-bounds and null pointers

Array operation 1 traversal

Array operation 2 obtains the maximum value

Array operations 3 reverse order

Array operations 4 table lookup method

Array operations 5 basic search

Overview of two-dimensional arrays and explanation of format 1

Memory diagram of two-dimensional array format 1

Explanation of two-dimensional array format 2

Memory diagram of two-dimensional array format 2

Explanation of two-dimensional array format 3

Memory diagram of two-dimensional array format 3

Two-dimensional array exercise 1 traversal

Two-dimensional array exercise 2 summation

Two-dimensional array exercise 3 Yang Hui triangle

Question 1: Parameter passing issues and illustrations in Java

Thinking Question 2 Analysis of Encryption Issues

Question 2 Implementation of the code for encryption issues

Question 2: Code improvements for encryption issues

Introduction of ideas and overview of process-oriented ideas

Overview of ideas and examples

Elephant put into refrigerator case

development, design and features

Classes and Objects

Overview of class definitions and analysis of student classes

Definition of student class

Definition of mobile phone category

Student use

Use of mobile phones

The memory map of an object

Memory map of two objects

Memory map of three objects

The difference between member variables and local variables

How to call the method when the formal parameter is the class name

Overview and applications of anonymous objects

Package overview

Encapsulation benefits and design principles

Overview and characteristics of the private keyword

Private application standard cases

Overview and application of this keyword

Memory diagram of this keyword

Standard mobile phone code and its testing

Constructor method overview and format

(Overloading and precautions of constructor methods

Classification and use of member methods

Code and tests for a standard student class

A standard mobile phone code and test

What is done to create the object

When to define member variables

Rectangle case exercise

Employee case exercises

Implement addition, subtraction, multiplication and division by yourself and test it

Introduction of static keyword

Characteristics of static keyword

static memory diagram

Precautions for static

The difference between static variables and member variables

Detailed explanation of the format of the main method

Use static in tool classes

Improvement of tools

Instructions making process

Use of tools and instructions

How to use the help documentation provided by JDK

Learn the random number function of Math class through JDK help documentation

Guess the number game case

Overview and classification of code blocks

Code block to see program writing results

Introduction and overview of inheritance

Inheritance cases and benefits of inheritance

Disadvantages of inheritance

Inheritance characteristics of classes in Java

Note on implementation of inheritance and when to use inheritance

Relationship between member variables in inheritance

The difference and application of this and super

The relationship between constructors and methods in inheritance

Things to note about constructors in inheritance

Interview questions in inheritance 1

Interview questions 2 in inheritance

Interview questions 3 in inheritance

Member method relationship in inheritance

Application of method overriding

Things to note about method overriding

Two interview questions

Using student and teacher cases before inheritance

Student and teacher cases using inheritance

Cat and dog case analysis

Cat and dog case implementation and testing

final keyword introduction

The final keyword modifies the characteristics of classes, methods and variables

The final keyword modifies local variables

Initialization timing of final modified variables

Overview and prerequisites for polymorphism

Provide code reflection according to the premise of polymorphism

Member access characteristics in polymorphism

Advantages of polymorphism

Disadvantages of polymorphism

Upcasting and downcasting in polymorphism

The case of Confucius pretending to be a father explains the phenomenon of polymorphism

Memory diagram in polymorphic inheritance

Memory diagram of object changes in polymorphism

Cat and dog case polymorphic version

Cases of Northerners and Southerners

Polymorphic exercises to see program writing results

Introduction of abstract classes

Characteristics of abstract classes

Characteristics of members of abstract classes

Abstract class practice cat and dog case

Abstract practice teacher case

Abstract practice student case

Abstract class practice employee case

Small problems in abstract classes

Introduction of interface

Interface characteristics

Interface member characteristics

The relationship between classes, classes and interfaces, and interfaces

The difference between abstract class and interface

Cat and dog case adding high jump function analysis

Cat and dog case adds high jump function code implementation

Teacher and student cases add smoking function analysis and code implementation

Athletes and coaches case studies

Athletes and coaches case implementation

Athletes and Coaches Case Tests

Class name as formal parameter

Abstract class name as formal parameter

Interface name as formal parameter

Class name as return value type

Abstract class name as return value type

Interface name as return value type

chain programming

Overview and function of package keyword

Package definition and precautions

Compile and run packaged classes

Access between classes in different packages

Overview and use of the import keyword

Testing of four permission modifiers

Common modifiers used by classes and their components

Internal class overview and access characteristics

Internal class classification and direct use of member internal classes

Common modifiers and applications of member inner classes

Interview questions for member internal classes

Problem with local inner class accessing local variables

Format and understanding of anonymous inner classes

Anonymous inner class method call

Application of anonymous inner classes in development

Anonymous inner class interview questions

Introduction to common development tools

Overview of Eclipse and MyEclipse

Download, install and uninstall Eclipse

How to write a HelloWorld case in Eclipse

How to compile and run programs in Eclipse

Eclipse Chinese translation and grammar checking tips

Eclipse windows and views overview

Basic configuration of Eclipse workspace

How to use content auxiliary keys in Eclipse

How to use shortcut keys in Eclipse

Automatic generation of constructor and get_set methods in Eclipse

Simplification of inheriting abstract classes or implementing interfaces in Eclipse

How to write a standard student class and its test in Eclipse

Write high jump interface abstract animal class and concrete animal subclass in Eclipse

How to generate a jar package in Eclipse and import it into a new project

How to create help documents and use jar packages in Eclipse

How to delete projects and import projects in Eclipse

Small issues to pay attention to when importing projects into Eclipse

Things to note when receiving projects during Eclipse development

Basic use of debug in Eclipse

Eclipse looks at parameter passing issues in Java

API overview

Learn the similarities and differences between Chinese and programming languages

Overview of Object class

hashCode() method of Object class

getClass() method of Object class

toString() method of Object class

equals() method of Object class

Code optimization of equals() method of Object class

finalize() method and clone() method of Object class

Scanner overview and construction method principles

Explanation of hasNextXxx() and nextXxx() methods of Scanner class

Scanner to obtain data minor problems and solutions

Overview of the String class

String class constructor

Characteristics of String cannot be changed once assigned

The difference between String literal objects and objects created by constructors

String interview questions look at the program writing results

Judgment function of String class

Simulated user login case

Breakpoint to view simulated user login case

The enhanced version of the simulated user login case joins the guessing game

Breakpoint view simulated user login case enhanced version joins the guessing game

Get function of String class

String traversal

Cases of counting the number of uppercase, lowercase and numeric characters

Breakpoint to view statistics on the number of uppercase, lowercase and numeric characters

Conversion function of String class

Convert the first letter of the string to uppercase and the rest to lowercase

Other functions of String class

Source code analysis of compareTo() method of String class

A case of concatenating int arrays into strings

An improved version of the case of concatenating int arrays into strings

String reversal case

Illustration of case ideas for finding the number of occurrences of a small string in a large string

Case code implementation of finding the number of occurrences of a small string in a large string

Find the number of occurrences of a small string in a large string case code optimization

Breakpoint to view the case of finding the number of occurrences of a small string in a large string

Overview of StringBuffer

Constructor method of StringBuffer class

Added functionality to StringBuffer

StringBuffer deletion function

StringBuffer replacement function

StringBuffer reverse function

StringBuffer interception function

Conversion between StringBuffer and String

Example of concatenating arrays into strings in a specified format

String reversal function example

Determine whether a string is symmetrical case

Two small interview questions about StringBuffer

String and StringBuffer are passed as parameters respectively

Illustration of the principle of advanced bubble sorting of arrays

Array advanced bubble sort code implementation

Illustration of the principle of advanced selection sorting of arrays

Array advanced selection sort code implementation

Sorting characters in a string case

Illustration of the principle of advanced binary search in arrays

Array advanced binary search code implementation

Things to note when using binary search

Overview and use of Arrays tool class

Source code analysis of Arrays tool class

Introduction of basic type wrapper classes

Integer constructor

Conversion between String and int types

Operation of base conversion in Integer

New features of JDK5: automatic boxing and unboxing

Interview questions about direct assignment of Integer

Overview of Character

Explanation of common methods of Character

Count the number of uppercase, lowercase and number occurrences in a string

How to verify a QQ number case

Overview and basic use of regular expressions

Regular expression composition rules

Regular expression judgment function

Verification email case

Regular expression split function

A small exercise in splitting functions

Sorting numbers in a string case

Regular expression replacement function

Overview of Patterns and Matchers

Regular expression acquisition function

Math class overview and method usage

How to get random number cases in any range

Overview and method usage of Random class

An explanation of the garbage collection method gc() in the System class

Explanation of exit() and currentTimeMillis() in System class

Explanation of arraycopy() in System class

Overview and construction method of BigInteger

The use of addition, subtraction, multiplication and division of BigInteger

Introduction and overview of BigDecimal

Use of addition, subtraction, multiplication and division of BigDecimal

Overview and construction method of Date

Conversion between date and milliseconds in Date class

DateFormat implements mutual conversion between dates and strings

Writing and testing cases for date tool classes

How many days have you been in this world? Case Study

Overview of the Calendar class and methods for obtaining calendar fields

add() and set() methods of Calendar class

How to get the number of days in February of any year

JAVA collection framework (1)

Memory diagram for array of objects

The origin of sets and their differences from arrays

Collection inheritance system diagram

Collection function overview

Basic functional testing of Collection collection

Advanced functional testing of Collections

Collection traversal, set to array traversal

Collection stores custom objects and iterates through cases

Iterator traversal of collections

Collection stores custom objects and iterates through cases

Discussion on issues using iterators

Illustration of steps for using collections

The principle and source code analysis of iterators

Collection stores strings and traverses

Collection stores student objects and traverses

List stores strings and traverses

Characteristics of List collection

List stores student objects and traverses

Overview and testing of unique features of List collection

Unique traversal function of List collection

List stores custom objects and traverses

Unique functions of ListIterator

Causes and solutions of concurrent modification exceptions

Data structures stack and queue

Data structures arrays and linked lists

Characteristics of the three subclasses of List

ArrayList stores strings and traverses

ArrayList stores custom objects and traverses

Vector’s unique features

Unique functions of LinkedList

Remove duplicate string elements from the ArrayList collection Case 1

Breakpoint view to remove duplicate elements case 1

Remove duplicate string elements from the ArrayList collection Case 2

Case of removing duplicate custom object elements from ArrayList collection

Collection code to implement stack structure using LinkedList

Use LinkedList to simulate a collection of stack data structures and merge test cases

Generics Overview and Basic Usage

ArrayList stores strings and traverses the generic version

ArrayList stores custom objects and traverses the generic version

Introducing generics through Object transformation issues

Overview and use of generic classes

Overview and use of generic methods

Overview and use of generic interfaces

Advanced generic wildcards

Enhance the overview and use of for

ArrayList stores strings and traverses the enhanced for version

ArrayList stores custom objects and traverses the enhanced for version

Overview and use of static imports

Overview and use of variable parameters

Use of the asList() method of the Arrays tool class

Case illustration of collection nested storage and traversal elements

Case code implementation of collection nested storage and traversal elements

Generating 10 random numbers between 1 and 20 requires that the random numbers cannot be repeated.

Case of inputting multiple data with the keyboard and outputting the maximum value on the console

Source code analysis of toString() method of ArrayList collection

User login registration case analysis illustration

Detailed analysis of user login registration cases and implementation of subcontracting

User login registration case implementation of user basic description class and user operation interface

User login registration case specific implementation of user operation class

Implementation of user test class for user login registration case

User login registration case user test class small problem solving

User login registration case join the guessing number game

Console shopping management system function demonstration

Set collection overview and characteristics

HashSet stores strings and traverses

Source code analysis of HashSet to ensure element uniqueness

HashSet stores custom objects and traverses

HashSet code implementation and illustration to ensure element uniqueness

HashSet stores custom objects and iterates through exercises

Overview and use of LinkedHashSet

TreeSet stores elements of type Integer and traverses them

Source code analysis of TreeSet to ensure element sorting

The principles and diagrams of TreeSet to ensure element uniqueness and natural ordering

TreeSet stores custom objects and traverses exercise 1

TreeSet stores custom objects and traverses Exercise 2

The principle and code implementation of TreeSet to ensure element uniqueness and comparator sorting

Reinterpretation of the source code of TreeSet's add() method and summary of TreeSet's sorting of elements

Generate 10 random numbers between 1-20 and require that the random numbers cannot be repeated. Simple version of the case

Case study of inputting student information with the keyboard and sorting it by total score and then outputting it on the console

Map collection overview and features

Function overview of Map collection

Basic functional testing of Map collection

Map collection acquisition function test

Map collection traversal to find the key value

Traversing the Map collection to find the key and value of the key-value pair object

Comparison of two methods of Map collection traversal

A case where the HashMap collection key is Stirng and the value is String

A case where the HashMap collection key is an Integer and the value is a String

The case where the HashMap collection key is String and the value is Student

The case where the HashMap collection key is Student and the value is String

Overview and use of LinkedHashMap

TreeMap collection key is a String value is a case of String

The case where the TreeMap collection key is Student and the value is String

Case illustration of counting the number of occurrences of each character in a string

Case code implementation for counting the number of occurrences of each character in a string

Breakpoint to view statistics of the number of occurrences of each character in a string

Case of HashMap collection nested HashMap collection

Case of HashMap collection nested ArrayList collection

Case of ArrayList collection nested HashMap collection

Aggregate multiple levels of nested data analysis

Collection of multi-level nested code manifestations

The difference between HashMap and Hashtable

Overview of the Collections utility class

Explanation of common methods of Collections tool class

ArrayList stores custom objects and sorts cases

Simulate the card shuffling and dealing of Landlords

Illustration of the principle of simulating the card shuffling, dealing and sorting of cards in Landlord

Code implementation to simulate Doudizhu shuffling and dealing cards and sorting the cards

Summary of characteristics and data structures of collections

How to choose which collection to use?

Summary of common functions and traversal methods of various collections

Overview of IO streaming technology

Overview and classification of exceptions

How the JVM handles exceptions by default

Handling exceptions using try...catch 1

Handling exceptions using try...catch 2

JDK7’s handling solution for multiple exceptions

The difference between compile-time exceptions and run-time exceptions

Several common methods of Throwable

Handling exceptions using throws

Overview of throw and the difference from throws

How to handle exceptions?

Characteristics and functions of finally keyword

Interview questions: The difference between final, finally and finalize

Interview question: If there is return before finally

An overview of variations in exception handling and custom exceptions

Implementation and testing of custom exceptions

Unusual precautions

Overview and construction method of File class

File class creation function

Delete function of File class

Renaming function of File class

Judgment function of File class

File class acquisition function

Advanced acquisition functions of File class

Example of outputting the file name with the specified suffix in the specified directory

File filter improvement case for outputting file names with specified suffixes in specified directories

Source code of list() method with file name filter

Batch modification of file names case

Recursion overview and considerations

Ideas and illustrations of recursive problem solving

Code implementation and memory diagram for recursively finding factorial

Breakpoint to view the execution process of recursive factorial calculation

Immortal Rabbit Problem Case

Example of recursively outputting the absolute paths of all java files in a specified directory

Recursively delete directory with content case

Breakpoint to view the execution process of deleting a directory with content

Overview and classification of IO flows

Overview of IO stream base class and a simple requirements analysis

Constructor of FileOutputStream

FileOutputStream writes data

Three write() methods of FileOutputStream

FileOutputStream writes data to implement line breaks and append writing

FileOutputStream writes data and adds exception handling

FileInputStream reads data

Byte stream copy text file case 1

How does the computer recognize and concatenate two bytes into Chinese?

Byte stream copy text file case 2

Byte stream copy picture case

Byte stream copy video case 1

FileInputStream reads data one byte array at a time

Comparison of two ways to read data using FileInputStream

Byte stream copy text file case 3

Byte stream copy video case 2

BufferedOutputStream writes data

BufferedInputStream reads data

Four ways of byte stream copying MP4 and testing efficiency

Reasons and formats for the occurrence of conversion streams

Overview of coding tables and common coding tables

Encoding and decoding issues in String class

Use of conversion stream OutputStreamWriter

Use of conversion stream InputStreamReader

5 ways to write data in character streams

Two ways to read data from character streams

Character stream copy text file case 1

Character stream copy text file case 2

Character stream copy text file case 3

The use of character buffer output stream BufferedWriter

The use of character buffer input stream BufferedReader

Character buffer stream copy text file case 1

Special features of character buffer streams

Character buffer stream copy text file case 2

IO flow summary diagram

5 ways to copy text files

4 ways to copy pictures

Example of storing data in a collection into a text file

Store data in text files into collections case

Randomly obtain name cases from text files

Copy single-level folder case

Copy the file with the specified suffix in the specified directory and modify the name case

Breakpoint to view the execution process of copying files and modifying the suffix name case

Copy multi-level folder case

Case study of inputting student information using the keyboard, sorting it by total score and writing it into a text file

Example of sorting strings in one file and then writing them to another file

Custom class simulates BufferedReader's readLine() function case

Use cases for LineNumberReader

Custom class simulates LineNumberReader's function case of getting line numbers

Knowledge review of login registration cases

Login registration case IO version implementation

Overview and explanation of data input and output flows

Overview and explanation of memory operation flow

Overview and features of print streams

PrintWriter is used as a subclass of Writer

PrintWriter implements automatic refresh and line wrapping

Print flow improvement copy text file case

Overview of standard input and output streams and the nature of output statements

Three ways to achieve keyboard entry

Output statements are improved with character buffer streams

Random access flow overview and writing out data

Random access streams read data and manipulate file pointers

Combined streams read the contents of two files and copy them into one file

Merge streams to read the contents of multiple files and copy them into one file

Overview and use of serialization and deserialization streams

How to solve the yellow warning line problem during serialization

How to prevent object member variables from being serialized

Overview of Properties and use as a Map collection

Use of special functions of Properties

Load() and store() functions of Properties

Determine whether the specified key exists in the file. If so, modify the value.

How to make the guessing number game only playable 5 times

Introduction to NIO and a case of NIO under JDK7

The introduction of multi-threaded programs

Process overview and the significance of multiple processes

Overview of threads and the significance of multithreading

Examples of multithreading and the difference between parallelism and concurrency

Is the running principle of Java program and the startup of JVM multi-threaded?

How to implement multi-threading and multi-threading method 1 ideas

Code implementation of multi-threading mode 1

Get and set thread object name

Thread scheduling and getting and setting thread priority

Thread control sleeping thread

Thread control - joining thread

Thread control courtesy thread

Thread control daemon thread

Thread control interrupt thread

Thread life cycle diagram

The idea and code implementation of multi-threading mode 2

Graphical comparison and differences between two methods of multithreading

Case Study of Selling Movie Tickets by Inheriting Thread Class

Case Study of Selling Movie Tickets by Implementing Runnable Interface

Analysis of the reasons why there are same tickets and negative tickets when buying movie tickets

Analysis of the causes of thread safety issues

Synchronized code blocks solve thread safety issues

Explanation of synchronized code blocks solving thread safety issues

Characteristics, benefits and drawbacks of synchronization

Fast locks for synchronized code and problems with application of synchronization methods and locks

Review of previous thread-safe classes

Overview and use of Lock after JDK5

Overview and use of deadlock problems

Producer-consumer problem description diagram

Producer consumer problem code 1

Producer consumer question code 2 and solve thread safety issues

Illustration of the producer-consumer waiting wake-up mechanism idea

Code implementation of producer-consumer waiting wake-up mechanism

Code analysis of producer-consumer waiting wake-up mechanism

Thread state transition diagram and common execution situations

Overview and use of thread groups

Producer-consumer waiting wake-up mechanism code optimization

Overview and use of thread pools

The idea and code implementation of multi-threading mode 3

Summing case of multi-threading mode 3

Implementing multi-threaded programs using anonymous inner classes

Overview and use of timers

Multiple execution code embodiment of scheduled tasks

Delete specified directories with content regularly

Common interview questions about multithreading

An overview of common object-oriented design principles

Overview and classification of design patterns

Overview and use of simple factory pattern

Overview and use of the factory method pattern

Singleton pattern: Hungry style

The lazy style of singleton pattern

Java code in singleton mode embodies the Runtime class

GUI overview and the difference between GUI and CLI

The difference between java.awt and javax.swing packages

Component inheritance diagram in GUI

HelloWorld form case

Optimize HelloWorld form case code

Overview and examples of event listening mechanism principles

Form close case

Adapter design pattern explained

Adapter class improves form closing case

Add a button to the form and add an event case to the button

Transfer text box value to text field case

Change the background color by moving the mouse over the button case

How to control that only numeric characters can be entered in the text box

First level menu case

Multi-level menu case

Overview and use of Netbeans

Simulation of four arithmetic operations cases

Modify the icon code of the form

How to set the code to center the form

How to modify the code of the form's skin

Add checksum prompts to four arithmetic operations cases

Review of the package structure of user login registration

Implementation of basic functions of user login and registration

User login and registration interface implementation

User login and registration interface jumps

The final version of user login registration

User login registration to join four arithmetic operations cases

Network Programming Overview

Network model overview and illustration

Overview of the three elements of network programming

Overview of IP in the Three Elements of Network Programming 1

IP Overview of Three Elements of Network Programming 2

Overview and use of the InetAddress class

Ports of the three elements of network programming

Protocols of the three elements of network programming

Socket communication principle diagram

UDP protocol sends data

UDP protocol receives data

Diagram of sending and receiving data using UDP protocol

UDP protocol sending and receiving data code optimization

The data on the sending end comes from the keyboard entry case

DOS window demonstration simple chat applet

Multi-threaded chat room program

Demonstration of a GUI version of the chat program case

TCP protocol sends data

TCP protocol receives data

Illustration of sending and receiving data using TCP protocol

The server gives the client a feedback case

Client keyboard input server console output

Client keyboard input server writes to text file

Client reads text file server console output

TCP protocol upload text file

TCP upload text file and give feedback

TCP protocol uploads pictures and gives feedback

Thoughts on uploading multiple clients to one server

Multi-threading improves the case of multiple clients uploading files

Class loading overview and loading timing

Overview and classification of class loaders

Reflection overview

Three ways to obtain class file objects

Obtain the no-argument constructor through reflection and use

Obtain the parameterized constructor through reflection and use

Get the private constructor via reflection and use

Get member variables through reflection and use

Obtain member methods with no parameters and return values ​​through reflection and use

Obtain member methods with parameters and return values ​​through reflection and use

Run configuration file contents via reflection

Bypassing generic checks via reflection

Write a general method to set a certain property of an object to a specified value through reflection

Lead intermediaries through user additions, deletions, modifications and student logins and registrations

Overview and implementation of dynamic agents

Overview and use of template design patterns

Decoration mode overview and usage

Review of new features of JDK5

Implement your own enumeration class

Implement enum class through enum

Notes on enumerations

Common ways to enumerate classes

Review and explanation of six new features of JDK7

Download, install and uninstall JDK

Interfaces can also have methods