Solve javac is not recognized as an internal or external command Error

The error javac is not recognized as an internal or external command arises when we try to compile any java source file using javac command. The reason for this error is because the path of javac command is not set properly. This error can be solved easily by setting javac compiler path in environment variables. How to solve javac is not recognized as an internal or external command Error? This can be done in two ways as given below.  

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