package com.cn.forecah;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
 * Set,List,Map,froeach的小例子
 * @author admin
 *
 */
public class SetTest {
    public static void main(String[] args) {
        String s1 = "hello "
 
;
        String s2 = "world ";
        String s3 = "!";
        //Set小例子
        Set<String> set = new HashSet<String>();        
        set.add(s1);
        set.add(s2);
        set.add(s3);
        System.out.println(set);

        for (String str : set) {
            System.out.print(str);
 

        }
        System.out.println();
        //List小例子
        List<String> list = new ArrayList<String>();
        list.add(s1);
        list.add(s2);
        list.add(s3);
        for (String str : list) {
            System.out.print(str);
        }
        System.out.println();
        //Map小例子
        Map<String,String> map = new HashMap<String,String>();
 

        map.put("1", s1);
        map.put("2", s2);
        map.put("3", s3);
        System.out.println(map);
        for(Map.Entry<String, String> entry : map.entrySet()){  
            System.out.println(entry);
        }   
    }
}