集合(2)把一个list集合中特定字段插入到另一个集合的特定字段中

List<Coupon> Couponlist=new ArrayList<Coupon>();

Couponlist=couponService.selectCouponByUniversityId(uId);

List<CouponMember> list=new ArrayList<CouponMember>();

if(Couponlist.size()>0){

list=couponMemberService.selectCouponSum(Couponlist);

}

if(list.size()>0){

for(int i=0;i<list.size();i++){

System.out.println(list.get(i).getSum());

Couponlist.get(i).setSum(list.get(i).getSum());

}

}