Java 用户自定义异常

class MyException extends Exception {
   String s1;

   MyException(String s2) {
      s1 = s2;
   }

   @Override
   public String toString() {
      return ("Output String = "+s1);
   }
}

public class NewClass {
   public static void main(String args[]) {
      try {
         throw new MyException("Custom message");
      } catch(MyException exp) {
         System.out.println(exp);
      }
   }
}