JAVA JDK8 List获取属性列表

概述

在jdk 1.8里，可以使用如下代码获取list元素对象中某个属性的列表。

package test;
import java.util.arraylist;
import java.util.list;
import java.util.stream.collectors;
public class listattrtest {
  public static void main(string[] args) {
    list<coupon> couponlist = new arraylist<>();
    coupon coupon1 = new coupon(1,100,"优惠券1");
    coupon coupon2 = new coupon(2,200,"优惠券2");
    coupon coupon3 = new coupon(3,300,"优惠券3");
    couponlist.add(coupon1);
    couponlist.add(coupon2);
    couponlist.add(coupon3);
    list<integer> resultlist = couponlist.stream().map(coupon::getcouponid).collect(collectors.tolist());
    system.out.println(resultlist);
  }
}

public class coupon {
  private integer couponid;
  private integer price;
  private string name;
  public coupon(integer couponid, integer price, string name) {
    this.couponid = couponid;
    this.price = price;
    this.name = name;
  }
  public integer getcouponid() {
    return couponid;
  }
  public void setcouponid(integer couponid) {
    this.couponid = couponid;
  }
  public integer getprice() {
    return price;
  }
  public void setprice(integer price) {
    this.price = price;
  }
  public string getname() {
    return name;
  }
  public void setname(string name) {
    this.name = name;
  }
}

打印结果如下：

[1, 2, 3]

总结

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