Java file compilation with file extension

Question

When I compile a Java program, I use javac file.java, while I run the code I use java file. 

Can anyone tell me why one has to explicitly specify file extension during compilation and not when one runs the Java program?

Answer 1

When you compile, you do javac MyClass.java tell the compiler that it’s a file and you provide it with the extension for it to find. 

When you run the compiled file ‘java .class’, you tell the application launcher to start the Java runtime environment and load the specified class.

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