how to echo java_home in windows cmd

To echo the value of the JAVA_HOME environment variable in the Windows Command Prompt, you can use the echo command and the %JAVA_HOME% variable.

Here's an example of how to echo the value of the JAVA_HOME environment variable in the Windows Command Prompt:

1. Open the Command Prompt.
2. Type the following command and press Enter:

echo %JAVA_HOME%

This will display the value of the JAVA_HOME environment variable on the command line. If the variable is not set, the command will display an error message.

To set the JAVA_HOME environment variable, you can use the set command. Here's an example of how to set the JAVA_HOME environment variable in the Windows Command Prompt:

1. Open the Command Prompt.
2. Type the following command and press Enter:

set JAVA_HOME=C:\Program Files\Java\jdk1.8.0_241

This will set the JAVA_HOME environment variable to the specified path. You can use any path that points to the root directory of a JDK installation.

To make the change permanent, you can set the JAVA_HOME environment variable in the System Properties. To do this, follow these steps:

1. Press the Windows key + R to open the Run dialog.
2. Type sysdm.cpl and press Enter.
3. In the System Properties window, click the Advanced tab.
4. Click the Environment Variables button.
5. In the Environment Variables window, under the System variables section, scroll down and find the JAVA_HOME variable.
6. Click the Edit button.
7. In the Edit Environment Variable window, enter the path to the JDK installation in the Variable value field.
8. Click OK.

This will set the JAVA_HOME environment variable for all users on the system.