class MyException extends Exception
{
    private int detail;
    public MyException(int a){
        detail = a;
    }
    @Override public String toString(){
        return "MyException" + detail;
    }
}
public class ExceptionDemo{
    public static void compute(int a) throws MyException {
        System.out.println("called compute("+a+")");
        if(a>10)
            throw new MyException(a);
        System.out.println("normal exit");
    }
    public static void main( String args[] ){
        try {
            compute(6 );
            compute( 12 );
        }
        catch(MyException e){
            System.out.println("Caught "+e);
        }
    }
}

------解决方案--------------------

Java code
public class Test extends TT {
    public static void main(String args[]){
        Test t = new Test("Tom");
    }
    public Test(String s){
        super(s);
        System.out.println("How do you do?");
    }
    public Test(){
        this("I am Tom");
    }
}

class TT{
    public TT(){
        System.out.println("What a pleasure!");
    }
    public TT(String s){
        this();
        System.out.println("I am "+s);
    }
}