How to fix 'javac' is not recognized as an internal or external command? Example

So you are trying to compile your Java source file and getting "'javac' is not recognized as an internal or external command". If this is your first Java program or HelloWorld then I suggest going through How to compile and run HelloWorld in Java because that explains what do you need before you compile and run any Java program. If you have crossed that level and knows about How to set PATH in Java then there is something wrong while setting PATH in Java. Anyway let's see when do you get this error and from where does 'javac' is not recognized as an internal or external command comes.
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Why use Underscore in Numbers from Java? Underscore in Numeric Literals Example

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