[Java][Resolved] void type not allowed here

Method showColor() in class A with return type void return nothing.
Invoking this method within System.out.println statement which return nothing would cause a RuntimeException, since it's don't know what should it print at Runtime environment:

Exception in thread "main" java.lang.RuntimeException: Uncompilable source code 

To resolve it , method 1 is set an return type to the method you used in System.out.println(), for example:

or you can move the method with void return type out from System.out.println() statement:

Reference:

http://stackoverflow.com/questions/2442675/void-type-not-allowed-here-error-java