How to install Java through the official website

Java installation steps:

1. Download

Official website address: http ://www.oracle.com/technetwork/java/javase/downloads/index.html

2. Install JDK

and run the exe executable directly The program can be installed by default;

Note: You can choose other drive letters for the path. It is not recommended that the path contains Chinese names and special symbols.

3. Configure environment variables

1) Create a new variable name: JAVA_HOME, variable value: C:\Program Files\Java\jdk1.8.0_11

2) Open PATH and add variable value: %JAVA_HOME%\bin;%JAVA_HOME%\jre\bin

3) Create a new variable name: CLASSPATH, variable value: .;%JAVA_HOME%\lib\dt .jar;%JAVA_HOME%\lib\tools.jar

Remarks:

1) . represents the current path, %JAVA_HOME% refers to the previously specified JAVA_HOME;

2) JAVA_HOME indicates the JDK installation path. This path includes lib, bin, jre and other folders. The operation of tomcat, eclipse, etc. all need to rely on this variable.

3) PATH allows the system to identify java commands in any path.

4) CLASSPATH is the path to load the class (class or lib) for java. The java command can only recognize the class if it is in the classpath.

4. Test jdk

Enter the javac java javadoc command in the CMD command window

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