Member { public void setCoupons(List<Coupon> coupons) { this.coupons = coupons; } @Builder  Member(String email, String name); void setCoupons(List<Coupon> coupons);  }
@Test public void test_01() { final Member member = new Member("asd@asd.com", "name"); final Coupon coupon = new Coupon(member); final List<Coupon> coupons = new ArrayList<>(); coupons.add(coupon); member.setCoupons(coupons); System.out.println(member.toString()); }