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<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;
    }
}

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; } }

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; } }