set the java home variable via the command line

1> Open Command Prompt (make sure you Run as administrator)
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3      Click on start Button >> type ' cmd 'in search Box >> Press Right mouse button on cmd >> 
4      In a pop-up select " Run as administrator "
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8> COPY THIS COMMAND & SET YOUR JDK INSTALLED PATH IN DOUBLE QUOTES (" ") :  
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10      setx -m JAVA_HOME "C:\Progra~1\Java\jdk1.8.0_XX"
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12  NOTE: If the path contains spaces, use the shortened path name.
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15> Restart Command Prompt to reload the environment variables 
16  then use the following command to check the its been added correctly. 
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18      echo %JAVA_HOME%
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20> You should see the path to your JDK (or JRE) installation.