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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.

Jun 09, 2020 am 10:17 AM

java

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.

Jun 08, 2020 pm 01:29 PM

java

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.

Jun 06, 2020 pm 04:54 PM

java

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.

Jun 06, 2020 pm 03:01 PM

java

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.

Jun 06, 2020 pm 02:50 PM

java

SpringMVC common annotations

Commonly used annotations in SpringMVC include @Controller, @RequestMapping, @Resource, @Autowired, @PathVariable, @requestParam, @Component, @Repository, etc.

Jun 04, 2020 pm 04:35 PM

java

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.

Jun 03, 2020 pm 05:58 PM

java

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.

Jun 03, 2020 am 10:47 AM

java 微服务框架

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.

Jun 02, 2020 pm 05:00 PM

java

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.

Jun 02, 2020 am 09:25 AM

java 堆栈

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.

Jun 01, 2020 pm 05:52 PM

java 构造函数普通函数

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.

Jun 01, 2020 pm 05:25 PM

java

How to run java program in dos

The method to run a java program in dos is: 1. Enter the location of the java file that needs to be run, such as D:\test\Test.java; 2. Execute the [javac Test.java] command to compile the file; 3. Execute [java Test] command to run the program.

Jun 01, 2020 pm 03:04 PM

dos java

What is the mechanism by which Java implements polymorphism?

The mechanism for realizing polymorphism in Java relies on the reference of the parent class or interface to point to the subclass, thereby realizing the characteristics of multiple forms of an object. The reference of the parent class dynamically points to the specific instance at runtime and calls the method of the reference. When running, it is not run according to the method defined in the type of the reference variable, but according to the method of the specific instance.

Jun 01, 2020 am 10:59 AM

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