Look at a standard computer keyboard. Which symbols on the keyboard are NOT legal symbols in a Java program? You should not consider the control keys such as, SHIFT, ALT, ESC, F1, F2, Enter, etc. for this problem. Also you should only consider Java programs that contain NO comments (because any symbol can appear inside a comment). Also, do not consider any string or character literals (since anything can appear inside a string).

This means all illegal characters in a Java application. Simple keystrokes in a keyboard.

Thanks a lot for your help!!!