Installing and configuring multiple versions of the JDK under Windows

1. Download the JDK that matches the system on the Oracle website as follows:

2. 2

   To install jdk1.7 as an example, double-click Run Jdk-7u80-windows-x64.exe and click Next:

   (Note: Choose a directory with a file name without spaces when selecting the JDK installation directory)

3. 3

   The installation screen appears and waits for the installation to complete:

4. 4

   After the JDK installation is complete, the installation interface of the JRE appears, change the installation directory of the JRE, and click Next:

5. 5

   The JDK installation was successful, click Close.

6. 6

   According to the installation method of jdk1.7, install jdk1.8 and jdk1.8 respectively, the directory after the installation is complete

   END

Configuring Environment variables

1. 1

   Right-click the computer, select Properties, select Advanced System settings, and create a new system environment variable:

   Variable name (N): Java_home

   Variable Value (V): JDK installation directory

   (e.g. C:\Application\Develop\Java\jdk\jdk1.7\jdk1.7.0_80)

2. 2

   New system environment variable CLASSPATH:

   Variable name (N): CLASSPATH

   Variable Value (V):.; %java_home%\lib\dt.jar;%java_home%\lib\tools.jar;

3. 3

   Edit environment variable Path:

   Variable name (N): path

   Variable Value (V):%java_home%\bin;%java_home%\jre\bin;

   END

Test JDK installation Complete and switch JDK version

1. 1

   Win + R, enter cmd, enter the Java command at the command prompt, as shown below:

2. 2

   Enter the Javac command at the command prompt, which appears as follows:

3. 3

   To view JDK version information, at the command prompt, enter the java-version command:

4. 4

   To switch the JDK version, you only need to modify the corresponding Java_home value, such as switching to jdk1.8, just change the java_home value to C:\Application\Develop\Java\jdk\jdk1.8\jdk1.8.0_ 131. View the version of the JDK after switching:

Installing and configuring multiple versions of the JDK under Windows