exchangeorchangedate.java~9~

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;

    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 {

  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("\n"+"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();

  }
}