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。
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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);
}
}
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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;
}
}
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打印结果如下：
[1, 2, 3]
总结
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原文链接：https://blog.csdn.net/linsongbin1/article/details/83933184