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Date4_ex.java *

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Date4_ex.java????????????????????????????????????????????????????????????? 2012-7-229:35

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1publicclassDate4

2{

3???? privateintyear,month,day;?????? //實例變量,私有

4???? staticintcount=0;????????????? //類變量

5???? publicDate4(int?y,int?m,int?d)

6???? {

7???????? year=y;

8???????? month=((m>=1)&(m<=12))?m:1;

9???????? day=((d>=1)&(d<=31))?d:1;

10???????? count++;

11???? }

12???? publicstaticvoidprint_count()? //類方法,只能訪問類變量

13???? {

14???????? System.out.println("count="+count+"??? ");

15???? }

16???? publicvoidprint()??????????????? //實例方法,可以訪問類變量和實例變量

17???? {

18???????? print_count();???????????????? //調用類方法;

19???????? System.out.println("dateis"+year+"-"+month+"-"+day);

20???? }

21???? publicvoidfinalize()???????????? //折構方法

22???? {

23???????? count--;

24???????? System.out.println("count="+count+"??? ");

25???? }

26}

27

28classDate4_ex

29{

30???? publicstaticvoidmain(Stringargs[])

31???? {

32???????? Date4a=newDate4(2012,7,21);

33???????? System.out.println("----------a.print_count();---------");

34???????? a.print_count();

35???????? System.out.println("----------a.print();---------------");

36???????? a.print();

37???????? Date4b=newDate4(2012,12,30);

38???????? System.out.println("----------b.print();---------------");

39???????? b.print();

40???????? System.out.println("----------a.finalize();------------");

41???????? a.finalize();

42???????? System.out.println("----------b.print_count();---------");

43???????? Date4.print_count();

44???? }

45}

46

輸出結果:

E:\src\chapter3>java Date4_ex

----------a.print_count();---------

count=1

----------a.print();---------------

count=1

date is 2012-7-21

----------b.print();---------------

count=2

date is 2012-12-30

----------a.finalize();------------

count=1

----------b.print_count();---------

count=1

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轉載于:https://www.cnblogs.com/xilifeng/archive/2012/07/22/2603459.html

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