JAVA JDK8 List获取属性列表

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;

   }

}