Java 非法启动类型？

Question

I have this:

class undefinedException extends Exception {
     super("Its not defined!");
}

But I am getting: illegal start of type

Whats wrong?

Thanks

Answer 1

It should be

class UndefinedException extends Exception {

       public UndefinedException() {
          super("Its not defined!");
       }

}

Answer 2

You need to put the super call inside a constructor.