package com.demo;


import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Random;
import java.util.Set;
import java.util.TreeMap;






public class test {


public static void main(String[] args) {
Random random = new Random();
Map<Integer,String> map = new TreeMap<Integer,String>();
map.put(random.nextInt(100), "wang");
map.put(random.nextInt(100), "pan");
map.put(random.nextInt(100), "zhang");
map.put(random.nextInt(100), "han");
map.put(random.nextInt(100), "li");
//遍历map的第一种方法（通过遍历map的key取其值）
Set<Integer> maps = map.keySet();
for (Integer key:maps) {
// System.out.println(map.get(key));
// System.out.println("key= "+ key + " and value= " + map.get(key));
}
//遍历map的第二种方法 ?推荐，尤其是容量大时
System.out.println("通过Map.entrySet遍历key和value");
Set<Entry<Integer, String>> maps1 = map.entrySet();
for (Map.Entry<Integer, String> map1 : maps1) {
System.out.println("key= " + map1.getKey() + " and value= " + map1.getValue());
}
//遍历map的第三种方法
// System.out.println("通过Map.entrySet使用iterator遍历key和value：");
? ? ? ? ?Iterator<Entry<Integer, String>> it = map.entrySet().iterator();
? ? ? ? ?while (it.hasNext()) {
? ? ? ? ? Entry<Integer, String> entry = it.next();
// ? ? ? ? ?System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
? ? ? ? ?}
? ? ? ? ?
? ? ? ? ?
}





}cs