5. Double-click the Path variable under System Variable to edit. (You can see JAVA_HOME already exists in the system variables), (some computers "Path" also write "PATH")

This is the java environment configuration, after the configuration is complete, you can start Eclipse to write code, it will automatically complete the java environment configuration.

Set 3 properties in System Variables, JAVA_HOME, PATH, CLASSPATH (case does not matter), click Edit if it already exists, click New if it does not exist.

The variable setting parameters are as follows:

• Variable name: JAVA_HOME
• Variable values: C: \Program Files (x86) / Java jdk1.8.0_91 // to be configured according to their actual path

• Variable name: CLASSPATH
• Variable values: .; % JAVA_HOME%\lib\dt.jar; % JAVA_HOME%\lib\tools.jar; Remember there's a "." in front of you.

• Variable name: Path
• Variable value: %JAVA_HOME%;bin; %JAVA_HOME%\jre\bin;

Note: If you use a version of JDK with more than 1.5, you can compile and run the Java program normally without setting the CLASSPATH environment variable.

Test the JDK through the console if it was installed successfully

1, at the same time press the keyboard "win", "R" two keys to open the run, enter "cmd" to determine the opening of the console.

2, type commands: java -version, java, javac several commands, the following information appears, indicating that the environment variable configuration is successful;

Linux, UNIX, Solaris, FreeBSD environment variable settings

The environment variable PATH should be set to point to the location where the Java binary is installed. If you're having trouble setting up, refer to the shell documentation.

For example, if you use bash as shell, you can add the following to the end of your .bashrc file: export PATH=/path/to/java:$PATH

Popular JAVA development tool

Is the so-called work to do good things must be first al-Algeoli, we also need a good development tool in the process of developing java language, the current market IDE a lot, this article recommends the following java development tools:

• Eclipse (recommended): Another free open source java IDE, download address: https://www.eclipse.org/eclipseide/

  Choose Eclipse IDE for Java Developers:

Run the first Java program with Eclipse

HelloWorld .java file code:

public class HelloWorld {
    public static void main(String []args) {
       System.out.println("Hello World");
    }
}