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public class FeildTest {

    public static void main(String[] args) {
        //定义list集合
        List<P> 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<String> 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;
    }
}