JAVA_内存解析

 1 class BirthDate {
 2     private int day;
 3     private int month;
 4     private int year;
 5     
 6     public BirthDate(int d, int m, int y) {
 7         day = d; 
 8         month = m; 
 9         year = y;
10     }
11     
12     public void setDay(int d) {
13         day = d;
14       }
15       
16     public void setMonth(int m) {
17         month = m;
18     }
19     
20     public void setYear(int y) {
21         year = y;
22     }
23     
24     public int getDay() {
25         return day;
26     }
27     
28     public int getMonth() {
29         return month;
30     }
31     
32     public int getYear() {
33         return year;
34     }
35     
36     public void display() {
37         System.out.println
38         (day + " - " + month + " - " + year);
39     }
40 }
41 
42 
43 public class Test1{
44     public static void main(String args[]){
45         Test1 test = new Test1();
46         int date = 9;
47         BirthDate d1= new BirthDate(7,7,1970);
48         BirthDate d2= new BirthDate(1,1,2000);    
49         test.change1(date);
50         test.change2(d1);
51         test.change3(d2);
52         System.out.println("date=" + date);
53         d1.display();
54         d2.display();
55     }
56     
57     public void change1(int i){
58         i = 1234;
59     }
60     
61     public void change2(BirthDate b) {
62         b = new BirthDate(22,2,2004);
63     }
64     
65     public void change3(BirthDate b) {
66         b.setDay(22);
67     }
68 }

 1 class Point {
 2     double x,y,z;
 3 
 4     Point(double _x,double _y,double _z) {
 5         x = _x;
 6         y = _y;
 7         z = _z;
 8     }
 9     
10     void setX(double _x){
11         x = _x;
12     }
13 
14     void setY(double _y){
15         y = _y;
16     }
17 
18     void setZ(double _z){
19         z = _z;
20     }
21 
22     double getInstance(Point p){
23         return (x -p.x) * (x -p.x) + (y -p.y) * (y -p.y) + (z -p.z) * (z -p.z);
24     }
25 }
26 
27 
28 public class TestPoint{
29     public static void main(String[] args){
30         Point p = new Point(1.0,2.0,3.0);
31         p.setX(2);
32         p.setY(3);
33         p.setZ(4);
34         System.out.println(p.x);
35         System.out.println(p.y);
36         System.out.println(p.z);
37 
38         System.out.println(p.getInstance(new Point(1.0,1.0,1.0)));
39     }
40 }