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- What is the usage of java regular expressions
- The usage of java regular expressions is: 1. The use of Matcher class, used for string verification; 2. The use of Matcher class, used for string replacement; 3. The use of Pattern class, used for string splitting; 4. Use regular expressions to determine whether a string is legal.
- JavaBase 3141 2020-06-13 11:02:30
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- Introduction to Spring Boot framework
- SpringBoot is the starting point for all projects developed based on Spring. Its design purpose is to allow developers to build Spring applications as quickly as possible and to reduce configuration files as much as possible. To put it simply, SpringBoot is not a framework, but a tool. .
- JavaBase 7313 2020-06-13 10:19:26
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- Is java front-end or back-end?
- Java is used for back-end, but based on Java, you can write Android framework, and the interface is also the so-called front-end. In fact, any language can be used for front-end and back-end, but there is a question of which aspect is better.
- JavaBase 9989 2020-06-12 11:24:57
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- Java's nine major data structures
- Java's nine major data structures: Stack, TreeMap, Vector, ArrayList, LinkedList, HashMap, HashSet, LinkedHashSet, and SortedSet. These structures implement the Map and Collection interfaces respectively.
- JavaBase 4168 2020-06-09 10:17:49
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- What is the difference between List and ArrayList in Java?
- The difference between List and ArrayLis in Java: List is an interface and implements the Collection interface, so the List interface has all the common methods provided by the Collection interface, while ArrayList is a dynamic number that implements the Collection and List interfaces.
- JavaBase 7185 2020-06-08 13:29:56
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- How to encrypt files in java
- The method of encrypting files in Java is: first use the input buffer byte stream to read the file content into the buffer; then use the byte array output buffer stream to write it into a byte array; then XOR each data in the array The operation implements encryption; finally, it is written to a specific file through a stream.
- JavaBase 4572 2020-06-06 16:54:32
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- What is a reference variable in Java?
- Java's reference variable is actually a pointer, which points to an object instance in the heap memory. It is equivalent to an alias for an array or object. Then you can use the reference variable in the stack to access the array in the heap in the program. or object.
- JavaBase 5991 2020-06-06 15:01:02
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- Is Java compiled or interpreted?
- Java is neither a traditional compiled language nor an interpreted language. Java is first compiled into a ".class" bytecode file and then interpreted and executed by the JVM virtual machine, so Java can be said to be a compiled language. , can also be said to be interpretive.
- JavaBase 10634 2020-06-06 14:50:54
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- SpringMVC common annotations
- Commonly used annotations in SpringMVC include @Controller, @RequestMapping, @Resource, @Autowired, @PathVariable, @requestParam, @Component, @Repository, etc.
- JavaBase 2893 2020-06-04 16:35:25
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- Java class loading process
- Java class loading process: The first is the loading process, which is to read the bytecode data from different data sources into the JVM virtual machine; then the connection, which is the core step, simply put the original class definition information smoothly Enter the process of JVM running; the last step is initialization. This step will actually execute the code logic of class initialization.
- JavaBase 3007 2020-06-03 17:58:17
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- What are the commonly used Java microservice frameworks?
- Commonly used Java microservice frameworks include: 1. spring boot, which makes microservice construction easier by handling configuration details; 2. helidon, which retains a lightweight, servlet-based core; 3. restlet, which Provides a larger set of features and connections.
- JavaBase 3645 2020-06-03 10:47:25
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- The difference between static and dynamic Java
- The difference between static and dynamic Java: 1. Static attributes are jointly owned by classes, while dynamic attributes are independently owned by each object of the class; 2. Static memory space is fixed, while dynamic memory space is in each subsidiary class. Allocation; 3. The allocation order is different. The space of static objects is allocated first, and then the non-static objects are allocated.
- JavaBase 5595 2020-06-02 17:00:27
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- How to understand the concepts of heap and stack in java
- The heap and stack in Java are two data structures. They are both places used by Java to store data in memory, and data items can only be inserted and deleted at one end. The storage speed of the stack is second only to the register, and the heap can dynamically distribute the size of the memory.
- JavaBase 3438 2020-06-02 09:25:02
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- What is the difference between constructors and ordinary functions in java
- The difference between constructors and ordinary functions in Java is that the constructor initializes the object when it is created, and the constructor can only be run once to create an object; ordinary functions are executed when the object calls them, and ordinary functions can be used by objects Called multiple times.
- JavaBase 3130 2020-06-01 17:52:14
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- What is the difference between Android development and Java development?
- The difference between Android development and Java development: Java is a language. Development based on the Java language can be Java development. Java development includes too many aspects, while Android development is a branch of Java development. Android development includes Android Application development, and Android system development.
- JavaBase 6185 2020-06-01 17:25:42
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