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标题: 请帮忙我！！！ [打印本页]

作者: lmy5360 时间: 2009-8-8 04:09 PM
标题: 请帮忙我！！！
public class TV{
  private int channel;
  private int volume;
  private boolean flag;

//no-arg constructor
  public TV(){}

//default constructor
  public TV(int channel,int volume,boolean flag){
   this.channel=channel;
   this.volume=volume;
   this.flag=flag;
  }

  public int getChannel(){
   return channel;
  }

  public int getVolume(){
   return volume;
  }

  public boolean isOn(){
   return flag;
  }

  public void setChannel(int channel){
   this.channel=channel;
  }

  public void setVolume(int volume){
   this.volume=volume;
  }

  public void volumeUp(){
   this.volume+=1;
  }

  public void volumeDown(){
   this.volume-=1;
  }

  public void setFlag(boolean flag){
   this.flag=flag;
  }

  public String toString(){
   return ((flag) ? "TV is on" : "TV is off") +
         "\nChannel is " + channel + "\nVolume is "
         + volume;

  }
}

import java.util.Scanner;
public class testTV{
  public static void main(String[] args){

//create object
TV tv = new TV();
Scanner input = new Scanner(System.in);

System.out.print("do you want to switch the power ? On = 1 or Off = 0: ");

      //powerOnOff = input.nextBoolean();
      int power = input.nextInt();

   if (power == 1)
   tv.setFlag(true);
   else if(power == 0){
               System.out.println("The tv is off ");
   //tv.setPowerOnOff(false);
   //else
System.exit(0);
            }

System.out.print("Enter the TV channel between 0 to 99: ");

      int channel = input.nextInt();
      if (channel >=0 && channel <=99)
tv.setChannel(channel);
else
System.exit(0);

System.out.print("Enter the TV volume between 0 to 20: ");
      int volume = input.nextInt();
      if (volume >=0 && volume <=99)
tv.setVolume(volume);
else
System.exit(0);

  // System.out.print("Pls increased the volume by unit: ");
  //       volume = input.nextInt();
  //    tv.setVolumeUp(volume);

  // System.out.print("Pls decreased the volume by unit: ");
  //       volume = input.nextInt();
  //    tv.setVolumeDown(volume);

//tv.setPowerOnOff(powerOnOff);
tv.setChannel(channel);
tv.setVolume(volume);
tv.volumeUp();
tv.volumeDown();

System.out.println(tv);
System.out.println("\nThe channel's TV is: " + tv.getChannel());
System.out.println("\nThe volume is : " + tv.getVolume());
System.out.println("\nWhen the volume increased by 1 \n" + tv);
System.out.println("\nWhen the volume decreased by 1 \n" + tv);
  }
}

为么 VOLUME dint increase & decrease!!!哪出了问题

作者: Super-Tomato 时间: 2009-8-8 09:44 PM

原帖由 lmy5360 于 2009-8-8 04:09 PM 发表
public class TV{
  private int channel;
  private int volume;
  private boolean flag;

//no-arg constructor
  public TV(){}

//default constructor
  public TV(int channel,int volume,bool ...

tv.setVolume(volume); //這裡設定 volume
tv.volumeUp(); //這裡 increase
tv.volumeDown(); // 這裡 decrease

我想會數學的人 50 + 1 - 1 也知道最終答案

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