Java tutorial
/* * Output: * * caught MyException[10] * */ class MyException extends Exception { private int detail; MyException(int a) { detail = a; } public String toString() { return "MyException[" + detail + "]"; } } public class MainClass { public static void main(String args[]) throws Exception { try { throw new MyException(10); } catch (MyException e) { System.out.println("caught " + e); } } }