jdk8 遍历List<Map>

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/forever_insist/article/details/82254740

package com.iflytek.zhangh;

import static java.util.stream.Collectors.toList;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 测试类
 * @author zhangh
 * @date 2018年8月31日下午12:48:15
 */
public class JDK8 {

    /**
     * JDK 新特性
     * @author zhangh
     * @date 2018年8月31日下午12:48:03
     * @param args
     */
    public static void main(String[] args) {

        Map<String, Object> map = new HashMap<>( );
        map.put("age", "11");
        map.put("name", "demo1");
        Map<String, Object> map1 = new HashMap<>( );
        map1.put("age", "22");
        map1.put("name", "demo2");
        Map<String, Object> map2 = new HashMap<>( );
        map2.put("age", "33");
        map2.put("name", "demo3");
        Map<String, Object> map3 = new HashMap<>( );
        map3.put("age", "44");
        map3.put("name", "demo2");

        List<Map<?, ?>> list = new ArrayList<>();
        list.add(map);
        list.add(map1);
        list.add(map2);
        list.add(map3);
        //筛选name =demo2 且 取出age的值拼成一个list
        List<String> li = list.stream().filter(m->m.get("name").equals("demo2")).map(m->m.get("age").toString()).collect(toList());
        System.out.println(li.toString());
    }
}

输出：
[22, 44]