import java.net.URI;

import java.util.*;

class Test{

public int m;

private int n;

public Test(int m,int n){

this.m=m;

this.n=n; //value=value;

}

public Test(){

this(3,8);

}

public void o(Object a){

System.out.println("Hello,I an father class");

}

public void output(){

System.out.println("m="+m+"n="+n);

}

}

class TestSon extends Test{

private int a;

private int b;

public TestSon(int m,int n,int a,int b){

super(m,n);

this.a=a;

this.b=b;

}

public void output(){

// super.output();

System.out.println("a="+a+"b="+b);

// System.out.println(super.m);

}

public void out(){

//super.output();

System.out.println("a="+a+"b="+b);

}

public void o(Date d){

System.out.println("Hello,I am son class");

}

}

public class HelloWorld{

public static void main(String[] args) throws Exception{

List<Integer> l=new LinkedList<>();

l.add(3);

l.add(1);

l.add(2);

Iterator i=l.iterator();

Iterator i1=l.iterator();

// l.add(5);

// i1.next();

// i1.remove();

i1.next();

i1.next();

while(i.hasNext())

System.out.println(i.next());

}

}