this和super关键字

//File:TT.java

class TT{
public TT(){
System.out.print("Hi!");
}
public TT(String s){
this();
System.out.print("I am "+s);
}
}

//File:Test.java
public class Test extends TT{
public static void main(String[] args){
Test t=new Test("Tom.");
}
public Test(String s){
super(s);
System.out.print("How are you?");
}
public Test(){
this("I am Jack.");
}
}

//判断程序的输出结果