public class OrderListEntity {/*** @deprecated  对象集合的处理* @param aData 集合a* @param bData 集合b* @return 返回集合a比集合b多出来的部分, 通过id判断*/public static List<OrderListEntity> AHasMoreThanBData(List<OrderListEntity> aData, List<OrderListEntity> bData) {List<OrderListEntity> moreEntities = new ArrayList<>();if (aData == null && bData == null) {return moreEntities;}for (OrderListEntity sAData : aData) {boolean isSame = false;for (OrderListEntity sBData : bData) {if (sAData.isTheSame(sBData)) {isSame = true;break;}}if (!isSame) {moreEntities.add(sAData);}}return moreEntities;}public OrderListEntity() {}public OrderListEntity(int id, String content) {this.id = id;this.content = content;}private int id;private String content;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getContent() {return content;}public void setContent(String content) {this.content = content;}public boolean isTheSame(OrderListEntity entity) {if (entity == null) return false;return this.id == entity.getId();}@Overridepublic String toString() {return "{" +"id=" + id +", content='" + content + '\'' +'}';}
}

public static void main(String[] args) {OrderListEntity entity1 = new OrderListEntity(1, "内容1");OrderListEntity entity2 = new OrderListEntity(2, "内容2");OrderListEntity entity3 = new OrderListEntity(3, "内容3");OrderListEntity entity4 = new OrderListEntity(4, "内容4");OrderListEntity entity5 = new OrderListEntity(5, "内容5");OrderListEntity entity6 = new OrderListEntity(6, "内容6");OrderListEntity entity7 = new OrderListEntity(1, "内容1");List<OrderListEntity> list1 = new ArrayList<>();list1.add(entity1);list1.add(entity2);list1.add(entity3);list1.add(entity4);List<OrderListEntity> list2 = new ArrayList<>();list2.add(entity4);list2.add(entity5);list2.add(entity6);//内容相同的两个对象也属于两个对象，contains是判断对象是否存在，创建另外一个对象，内容相同也是不存在的System.out.println("是否存在：" + list1.contains(entity7));System.out.println("是否相同-(equals)：" + entity1.equals(entity7));System.out.println("是否相同-(==)：" + (entity1 == entity7));//通过比较id是否相同判断是否是一个订单System.out.println("是否相同-(id比较)：" + entity1.isTheSame(entity7));System.out.println("\n");System.out.println("list1比list2多出来的部分：");//listEntities1比listEntities2多出来的部分List<OrderListEntity> orderListEntities1 = OrderListEntity.AHasMoreThanBData(list1, list2);for (OrderListEntity orderListEntity : orderListEntities1) {System.out.print(orderListEntity.toString());}System.out.println("\n");System.out.println("list2比list1多出来的部分：");//listEntities2比listEntities1多出来的部分List<OrderListEntity> orderListEntities2 = OrderListEntity.AHasMoreThanBData(list2, list1);for (OrderListEntity orderListEntity : orderListEntities2) {System.out.print(orderListEntity.toString());}}

 运行结果：