java8 从对象集合中取出某个字段的集合

public class FeildTest {

    public static void main(String[] args) {
        //定义list集合
        List
 list = Arrays.asList(new P(1, "哈哈"), new P(2, "嘿嘿"), new P(3, "呵呵"));
        //从list集合中，取出字段name的列表
        List names = list.stream().map(p -> p.getName()).collect(Collectors.toList());

        System.out.println(names);
    }
}
class P{
    int id;
    String name;

    public P(int id, String name) {
        this.id = id;
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

 

 

转载于:https://www.cnblogs.com/yangzhenlong/p/7007257.html