What does java mean?

Java is an object-oriented programming language and a widely used computer programming language. It has the characteristics of cross-platform, object-oriented, and generic programming. It is widely used in enterprise-level web application development and mobile application development.

Java not only absorbs the various advantages of the C language, but also abandons the concepts such as multiple inheritance and pointers that are difficult to understand in C. Therefore, the Java language is powerful, simple and easy to use. Use two features. As a representative of static object-oriented programming languages, Java language perfectly implements object-oriented theory and allows programmers to perform complex programming with an elegant way of thinking. [Recommended learning: java course]

Java is a strongly typed language, which allows extended compile-time checking for potential type mismatch issues. Java requires explicit method declarations and does not support C-style implicit declarations.

Java has the characteristics of simplicity, object-oriented, distributed, robustness, security, platform independence and portability, multi-threading, and dynamics. Java can write desktop applications, Web applications, distributed systems and embedded system applications, etc.

Programming environment

JDK (Java Development Kit) is called Java development kit or Java development tool. It is a program development program for writing Java Applet applets and applications. environment. JDK is the core of the entire Java, including the Java Runtime Environment (Java Runtime Envirnment), some Java tools and Java core class libraries (Java API).

Any Java application server essentially has a certain version of JDK built-in. The mainstream JDK is the JDK released by Sun. In addition to Sun, many companies and organizations have developed their own JDKs, such as JDK developed by IBM, Jrocket by BEA, and JDK developed by the GNU organization.

In addition, the Java SE API subset and Java virtual machine in the Java API class library can be collectively referred to as JRE (JAVA Runtime Environment). JRE is a standard environment that supports the running of Java programs.

JRE is a running environment, and JDK is a development environment. Therefore, JDK is needed when writing Java programs, and JRE is needed when running Java programs. The JDK already contains JRE, so as long as the JDK is installed, you can edit Java programs and run Java programs normally. However, since JDK contains a lot of content that has nothing to do with running and takes up a lot of space, you do not need to install JDK to run ordinary Java programs, but only need to install JRE.

Programming Tools

Eclipse: an open source, Java-based extensible development platform.

NetBeans: Open source Java integrated development environment, suitable for various client and Web applications.

IntelliJ IDEA: It has very good functions in automatic code prompts, code analysis, etc.

MyEclipse: A commercial software developed by Genuitec, it is a widely used integrated development environment for Java applications.

EditPlus: If the Java compiler "Javac" and the interpreter "Java" are correctly configured, you can directly use EditPlus to compile and execute Java programs.

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