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package map;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

public class Demo2 {

public static void main(String[] args) {

Map<Integer, String> map = new HashMap<Integer, String>();

map.put(1, "aaaa");

map.put(2, "bbbb");

map.put(3, "cccc");

System.out.println(map);

//

// 获取方法：

// 第一种方式: 使用keySet

// 需要分别获取key和value，没有面向对象的思想

// Set<K> keySet() 返回所有的key对象的Set集合

Set<Integer> ks = map.keySet();

Iterator<Integer> it = ks.iterator();

while (it.hasNext()) {

Integer key = it.next();

String value = map.get(key);

System.out.println("key=" + key + " value=" + value);

}

}

}