exchangeorchangedate.java~7~

提供了常用的JAVA技术的示例

package ExchangeOrChangeDate;


import javax.swing.UIManager;
import java.awt.*;

class Date{
  private int year;
  private int month;
  private int day;
  // 定 义 几 个 方 法
  int getYear(){return year;}
  int getMonth(){return month;}
  int getDay(){return day;}
  void setDate(int y,int m,int d){
    year=y;
    month=m;
    day=d;
  }
  void showDate(){
  System.out.println(year+","+month+","+day);
  }
}
public class ExchangeOrChangeDate {
// 定 义 几 个 方 法
void exchangeDate(Date x,Date y){
  Date temp=new Date();
  temp.setDate(x.getYear(),x.getMonth(),x.getDay());//x 的值存入 temp
  x.setDate(y.getYear(),y.getMonth(),y.getDay());//y 的值存入 x
  y.setDate(temp.getYear(),temp.getMonth(),temp.getDay());//temp 的值存入 y
}

void changeDate(Date x,int dayDelayed){
  int year = x.getYear();
  int month= x.getMonth();
  int day  = x.getDay();
  x.setDate(year,month,day+dayDelayed);
}

public static void main(String[] args) {
  Date d1=new Date();
  Date d2=new Date();
  d1.setDate(1999,12,31);
  d2.setDate(2000,1,1);
  System.out.print("d1: ");
  d1.showDate();
  System.out.print("d2: ");
  d2.showDate();

  ExchangeOrChangeDate  ex=new ExchangeOrChangeDate();
  ex.exchangeDate(d1,d2);
  System.out.println("d1 and d2 will be exchanged");
  System.out.print("d1 :");
  d1.showDate();
  System.out.print("d2 :");
  d2.showDate();

  int delay=2;
  ex.changeDate(d1,delay);
  System.out.println("\n"+"d1 will be changed !");
  System.out.print("d1 :");
  d1.showDate();


  }
}