java练习，为啥总是输出false

编写Order类，有int型的orderId，String型的orderName，相应的getter()和setter()方法，两个参数的构造器，重写父类的equals()方法：public boolean equals(Object obj),并判断类中创建的两个对象是否相等。

public class Test {
    public static void main(String[] args){
        Order o1 = new Order(123,"a");
        Order o2 = new Order(123,"a");
        System.out.println(o1.equals(o2));
    }
}

public class Order {
    public Order(int orderId,String orderName){
        this.orderId=orderId;
        this.orderName=orderName;
    }
    int orderId;
    String orderName;

    public int getOrderId() {
        return orderId;
    }

    public void setOrderId(int orderId) {
        this.orderId = orderId;
    }

    public String getOrderName() {
        return orderName;
    }

    public void setOrderName(String orderName) {
        orderName = orderName;
    }

    public boolean Order(Object obj) {
        boolean flag=false;
        if(obj instanceof Order){
            Order o=(Order) obj;
            if(this.orderId==o.orderId&&this.orderName.equals(o.orderName)){
                return true;
            }
        }
        return false;
    }
}

public boolean Order(Object obj) {。。。} 改成重写equals和hashcode方法，可以编译器自己生成