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package com.test;

import java.util.ArrayList;

import java.util.HashSet;

import java.util.LinkedList;

import java.util.List;

import java.util.TreeSet;

class Drink implements Comparable{

public String name;

@Override

public int compareTo(Object var1)

{

return 1;

}

}

public class Test_03

{

public static void main(String[] args)

{

Drink d1=new Drink();

Drink d2=new Drink();

d1.name="Coffee";

d2.name="Tea";

TreeSet set=new TreeSet();

set.add(d1);

set.add(d2);

for(Object o:set)

System.out.println(((Drink)o).name);

List list=new ArrayList<>();

LinkedList linkList=new LinkedList<>();

linkList.add(0, "zhangsan");

list.add(0,"lisi");

}

}