Why ; not showing any exception?

While I am working with eclipse ID then I suddenly found that I put double semicolon in variable declaration.

Below is my statement 

double defaultValue = 0.0;;

I am getting confused here. I expected the above statement throw an exception but I wrong above statement run without any error.

Why double semicolon not showing any error?

Jon Skeet
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It's an empty statement, that's all. It's perfectly legal, though usually useless. It's specified in section 14.6 of the JLS:

An empty statement does nothing.

  EmptyStatement:
      ;

Execution of an empty statement always completes normally.

Just about the only time I've ever actually seen it used is to give a loop an empty body, e.g.

while (somethingWithSideEffects()) 
    ;

Personally I'd prefer to use braces in that case (or change the code to not use side effects in that way), but that's a matter of personal preference.

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