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1  public class BirthDate {
2 private int day;
3 private int month;
4 private int year;
5
6 public BirthDate (){}
7
8 public BirthDate (int d,int m,int y){
9 day = d;
10 month = m;
11 year = y;
12 }
13
14 //getting and setting¡­¡­
15
16 public void display(){
17 System.out.println(year + "-" + month + "-" + day);
18 }
19  }
20  public class TestBirthDate{
21 public static void main(String args[]){
22 Example ex = new Example();
23 int date = 9;
24 BirthDate d1= new BirthDate(7,7,1970);
25 BirthDate d2= new BirthDate(1,1,2000);
26 ex.change1(date);
27 ex.change2(d1);
28 ex.change3(d2);
29 System.out.println("date=" + date);
30 d1.display();
31 d2.display();
32 }
33 public void change1(int i){ i = 1234; }
34 public void change2(BirthDate b){
35 b = new BirthDate(22,2,2004);
36 }
37 public void change3(BirthDate b){
38 b.setDay(22);
39 }
40  }
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