First, class Flaw must not be final. Otherwise it cannot be extended.
Second, there are several brackets }} at the wrong places. To avoid this, use propper indentation of your code. The indentation is visible on the Ranch only if you use the - tag when posting. Do this.
Third: method method is declared to return an int but doesn't.
Number four, with f.name and f.age you are referring to variables but you don't assign anything to it. This is also not possible.
Number five: Your user name should not be in uppercase letters.
By the way: The compiler only shows one error in the first place (15: 'class' or 'interface' expected). This cryptic message comes from one of the misplaced brackets in the line before. If you remove this error and resave, compiler will tell you more errors.