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- Introduction to java cross-platform principles
- Java cross-platform principle: Java compiles a file (.java) into a bytecode file (.class), and then the bytecode is interpreted into machine code on the Java virtual machine. Bytecode (.class) files are not oriented to any specific platform, only to virtual machines.
- Javagetting Started 3163 2020-02-13 17:58:58
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- What is the difference between throws and try...catch in java?
- This article comes from the java introductory tutorial column. It explains the difference between throws and try...catch in java through examples. I hope it can help you. Throws throws an exception and the subsequent code will not be executed, while try...catch throws the exception and continues to execute the following code.
- Javagetting Started 2270 2020-02-12 18:07:18
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- How does HashMap work?
- This article comes from the Java Quick Start column. It analyzes the working principle of hashmap in detail. I hope it can help you. HashMap is implemented based on the Hash algorithm. HashMap will obtain the hash value of the key based on the key.hashCode() method.
- Javagetting Started 2979 2020-02-11 18:05:35
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- Java language is an object-oriented programming language suitable for what
- The Java language is an object-oriented programming language suitable for software development in a network environment; as a representative of static object-oriented programming languages, the Java language excellently implements the object-oriented theory and allows programmers to perform complex tasks in an elegant way of thinking. programming.
- Javagetting Started 11539 2020-02-11 11:22:27
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- What is the difference between ArrayList and LinkedList in java?
- This article comes from the java introductory tutorial column. This article provides a detailed analysis of the differences between ArrayList and LinkedList in java. I hope it can help you. ArrayList is an array in terms of data structure implementation, while LinkedList is a doubly linked list.
- Javagetting Started 2455 2020-02-10 18:02:56
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- How to open java program
- How to open a java program: First press the WIN+R keys to open the run window, enter cmd to open the command prompt; then enter the directory where the Java program is located; finally use "java java program file name" and "java -jar jar file name" Command to open the Java program.
- Javagetting Started 23312 2020-02-10 11:52:51
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- What should I do if the java program does not exit?
- The reason why the Java program does not exit is because setDefaultCloseOperation was not added when creating the window program. This code defines the operation performed by the program when the user clicks the window close button. With this added, the program can exit normally.
- Javagetting Started 2986 2020-02-10 11:31:38
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- How to implement queue through array in java
- This article comes from the Java Quick Start column. It demonstrates how to implement queues through arrays through examples. I hope it can help you. If the queue is implemented using an array (sequential storage structure) or a linked list (linked storage structure), it needs to follow the first-in, first-out rule.
- Javagetting Started 2617 2020-02-08 17:38:27
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- Java object creation process
- This article comes from the Java introductory tutorial column. It introduces the creation process of Java objects in detail. I hope it can help you. When the JVM encounters an instruction to create a new object, it first checks whether the parameters of the instruction can be defined in the constant pool to a symbolic reference to a class, and then loads the class.
- Javagetting Started 2633 2020-02-07 17:24:58
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- what is awt
- The full English name of awt is "Abstract Window Toolkit", which means abstract window toolkit. This package provides a set of interfaces for interacting with local graphical interfaces; awt is the basic tool provided by Java to build and set up Java graphical user interfaces.
- Javagetting Started 6148 2020-02-07 10:34:40
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- How thread pool is implemented
- This article comes from the Java Quick Start column. It introduces several implementation methods of thread pool in detail. I hope it can help you. Executors currently provide 5 different thread pool creation configurations, such as [newCachedThreadPool].
- Javagetting Started 3567 2020-02-06 18:26:54
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- What is Spring?
- Spring is an open source lightweight Java development framework. Its role is to simplify application development. The advantage is that it adopts a layered structure and can be incrementally introduced into the project. It is a lightweight architectural solution.
- Javagetting Started 11266 2020-02-06 10:38:06
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- Introduction to object-oriented features of java
- This article comes from the java introductory tutorial column. It introduces the three major features of object-oriented in detail. I hope it can help you. The three major characteristics of Java object-oriented are: 1. Encapsulation; 2. Inheritance; 3. Polymorphism.
- Javagetting Started 2326 2020-02-05 17:54:53
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- cmd running 'java -version' prompts that the main class cannot be found or cannot be loaded
- The solution when running "java -version" under cmd prompts that the main class cannot be found or cannot be loaded is: create a new CLASSPATH variable under system variables and add [.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib \tools.jar;].
- Javagetting Started 5460 2020-02-05 16:17:26
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- How to check whether the java environment is installed
- The method to check whether the Java environment is installed is: 1. First open the run window, enter cmd, and open the command prompt interface; 2. Then enter java. If it prompts "java is not an internal or external command, nor is it an operable program or batch Processing files", it means it is not installed, otherwise it means it is installed.
- Javagetting Started 21873 2020-02-05 15:54:08
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