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    1. package com.atguigu.exercise4;
    2. public class MyDate {
    4.     private int day;
    5.     private int month;
    6.     private int year;
    8.     public MyDate(int day,int month,int year){
    9.   this.day = day;
    10.   this.month = month;
    11.   this.year = year;
    12.     }
    13.     public int getDay() {
    14.   return day;
    15.     }
    16.     public void setDay(int day) {
    17.   this.day = day;
    18.     }
    19.     public int getMonth() {
    20.   return month;
    21.     }
    22.     public void setMonth(int month) {
    23.   this.month = month;
    24.     }
    25.     public int getYear() {
    26.   return year;
    27.     }
    28.     public void setYear(int year) {
    29.   this.year = year;
    30.     }
    31.     @Override
    32.     public boolean equals(Object obj) {
    33.   if(this == obj){//先比较地址
    34.       return true;
    35.   }
    36.   if(obj instanceof MyDate){//判断是否为MyDate
    37.       MyDate myDate= (MyDate)obj;
    38.       return this.day == myDate.day && this.month == myDate.month &&  
    39.         this.year == myDate.year;  //比较每个属性
    40.   }
    41.   return false;
    42.     }
    45. //    @Override
    46. //    public boolean equals(Object obj) {
    47. //  if (this == obj)
    48. //      return true;
    49. //  if (obj == null)
    50. //      return false;
    51. //  if (getClass() != obj.getClass())
    52. //      return false;
    53. //  MyDate other = (MyDate) obj;
    54. //  if (day != other.day)
    55. //      return false;
    56. //  if (month != other.month)
    57. //      return false;
    58. //  if (year != other.year)
    59. //      return false;
    60. //  return true;
    61. //   }
    63. }
    1. package com.atguigu.exercise4;
    2. public class MyDateTest {
    3.     public static void main(String[] args) {
    4.   MyDate m1 = new MyDate(14,3,1976);
    5.   MyDate m2 = new MyDate(14,3,1976);
    7.   if(m1 == m2){
    8.       System.out.println("m1==m2");
    9.   }else {
    10.       System.out.println("m1 != m2");
    11.   }
    12.   if(m1.equals(m2)){
    13.       System.out.println("m1 is equals to m2");
    14.   }else{
    15.       System.out.println("m1 is not equals to m2");
    16.   }
    17.     }
    18. }