equals方法重写

public class Order {private int Orderid;private String OrderName;public int getOrderid() {return Orderid;}public void setOrderid(int orderid) {Orderid = orderid;}public String getOrderName() {return OrderName;}public void setOrderName(String orderName) {OrderName = orderName;}public Order(int orderid, String orderName) {super();Orderid = orderid;OrderName = orderName;}public boolean equals(Object obj){/*if((this.Orderid==or.Orderid)&&(this.OrderName==or.OrderName))return true;elsereturn false;*/if(this==obj)return true;elseif(obj instanceof Order){Order or=(Order)obj;return this.Orderid==or.Orderid&&(this.OrderName.equals(or.OrderName));}elsereturn false;}}