java 内存分析

 1、实体类BirthDate

1package Demo;
2
3public class BirthDate {
4	private int day;
5	private int month;
6	private int year;
7	
8	public BirthDate(int d, int m, int y) {
9		day = d;
10		month = m;
11		year = y;
12	}
13	public void Display() {
14		System.out.println(day+"-"+month+"-"+year );
15	}
16	public int getDay() {
17		return day;
18	}
19
20	public void setDay(int day) {
21		this.day = day;
22	}
23
24	public int getMonth() {
25		return month;
26	}
27
28	public void setMonth(int month) {
29		this.month = month;
30	}
31
32	public int getYear() {
33		return year;
34	}
35
36	public void setYear(int year) {
37		this.year = year;
38	}
39	
40}

2、测试类

1package Demo;
2
3public class Demo {
4	public static void main(String[] args) {
5
6		Demo demo = new Demo();
7		int date = 9;
8		BirthDate d1 = new BirthDate(7, 7, 1970);
9		BirthDate d2 = new BirthDate(1, 1, 2000);
10		demo.change1(date);
11		demo.change2(d1);
12		demo.change3(d2);
13
14	}
15	public void change1(int i) {
16		i = 1234;
17	}
18	public void change2(BirthDate b) {
19		b = new BirthDate(22, 2, 2004);
20	}
21	public void change3(BirthDate b) {
22		b.setDay(22);
23	}
24}

3、内存分析

• Demo demo = new Demo();

• int date = 9;