Configuration of Java Environment variables

 

Install JDK, such as directory in D:\Java\jdk1.7.0_71\bin

In order to facilitate the development of Java programs, you need to configure the environment variables, right-click My Computer---Properties----environment variable-----User variables in the [New (N)] Add the following environment variables

(Assuming that your JDK installation path is D:\Java\jdk1.7.0_71\bin)

Java_home
D:\Java\jdk1.7.0_71

PATH
D:\Java\jdk1.7.0_71\bin

CLASSPATH
.; %java_home%\lib\dt.jar;%java_home%\lib\tools.jar; (Note the preceding dot and semicolon must not be lost, and the middle, the semicolon in the back should not be lost)

Description: Classpath can add some third-party jar files, which is convenient to compile and run the program manually.

You can test it once you've built it up separately.

Description: If the computer is only using the variables above, it is recommended to set the user variable.

A simple test program can be written using tools such as Notepad, saved in D:\, with the following code:

publicclass Test {     public static voidmain(String[] args) {    System.out.println("Hello java!");    }}

Note: Keep in mind that the file name and class name are the same and the suffix name (. java)

Run cmd, enter the DOS interface, run java-version, and if the above environment is configured correctly, the current JDK version information should be displayed. (This command can be run in any directory)

Run Javac D:\Test.java, enter the same directory will compile the generated file Test.class,

Run D: Enter the D packing directory,

Run Java Text, enter output Hello java!

Configuration of Java Environment variables