CH02_1_2012-9-20写的一个类程序

先写的MyDate

package cn.pzhu.java.ch02.objectbasic;public class MyDate {int year;int month;int date;void show() {System.out.println(year + "-" + month + "-" + date);}void nextDate(){//////随便写的一个if(date>28){System.out.println("Sorry,I don't know");}else{date+=1;System.out.println(year + "-" + month + "-" + date);}}}

接下来写的对这个类的测试

package cn.pzhu.java.ch02.objectbasic;public class TestDemo {public static void main(String[] args) {MyDate zhang3=new MyDate();zhang3.year=1990;zhang3.month=2;zhang3.date=10;MyDate li4=new MyDate();li4.year=1995;li4.month=10;li4.date=31;/*System.out.println(zhang3.year+"-"  +zhang3.month+"-"  +zhang3.date);System.out.println(li4.year+"-"  +li4.month+"-"  +li4.date);*/zhang3.show();zhang3.nextDate();li4.show();li4.nextDate();}}