2019.1.19equals方法重写

 1 package com.vote;
 2 
 3 public class Car {
 4     private String color;//颜色
 5     private String brand;//品牌
 6     private int plate;//车牌
 7     
 8     public Car(String color,String brand,int plate) {
 9         this.color = color;
10         this.brand = brand;
11         this.plate = plate;
12     }
13     
14     public String getColor() {
15         return color;
16     }
17     public void setColor(String color) {
18         this.color = color;
19     }
20     public String getBrand() {
21         return brand;
22     }
23     public void setBrand(String brand) {
24         this.brand = brand;
25     }
26 
27     public int getPlate() {
28         return plate;
29     }
30 
31     public void setPlate(int plate) {
32         this.plate = plate;
33     }
34 
35     public boolean equals(Object obj) {
36         if(obj instanceof Car) {
37             Car u = (Car)obj;
38             if(u.getBrand().equals(this.getBrand())&&u.getColor().equals(this.getColor())&&u.getPlate()==this.getPlate()) {
39                 return true;
40             }
41         }
42         return false;
43     }
44     
45 
46     
47 }

 1 package com.vote;
 2 
 3 public class TestCar {
 4     public static void main(String[] args) {
 5         Car car1 = new Car("黄色","兰博基尼",55379);
 6         Car car2 = new Car("黄色","兰博基尼",55379);
 7         System.out.println(car1==car2);
 8         System.out.println(car1.equals(car2));
 9     }
10 }