map集合-遍历

  public static void main(String[] args) {
        //创建Map对象
        Map<String,String> map = new HashMap<String,String>();
        //添加映射关系
        map.put("001", "小王");
        map.put("002", "小张");
        map.put("003", "小刘");
        //遍历Map对象
        Set<String> keys = map.keySet(); // 拿到所有的key集合
        for (String key : keys) {
            String value = map.get(key);
            System.out.println("编号：" + key + "---" + "姓名：" + value);
        }
        System.out.println ( "=============================" );
        Map<String,String> map1 = new HashMap<String,String>();
        //添加映射关系
        map1.put("001", "小王");
        map1.put("002", "小赵");
        map1.put("003", "小梁");
        //遍历Map对象
        Set<String> keys1 = map.keySet(); // 拿到所有的key集合
        for (String key : keys1) {
            String value = map.get(key);
            System.out.println("编号：" + key + "---" + "姓名：" + value);
        }
        System.out.println ( "=============================" );
        for (String key : keys) //遍历key
        {
            if(map.get ( key).equals ( map1.get ( key ) )) //如果两个map对应的value值相同
            {
                String value = map.get(key); //输出value值
                System.out.println("编号：" + key + "---" + "姓名：" + value);
            }
        }
        //map判空
        System.out.println("map为空：" + map.isEmpty());
    }