Java - 更改數據字段？

Question

有兩件事我需要幫助，但我很難搞清楚。他們在下面列出 - 非常感謝任何幫助。

1）我需要添加一個方法，提示用戶輸入一個int（1-3）來改變音量（默認設置爲2）。我真的很難搞清楚如何完成這項工作。

2）我需要補充的是提示用戶輸入一個int（1類似的方法或2）堵塞頭的手機在

這裏是我的代碼。一個是測試類：

//Open Package 
package headphone_wk6; 

//Import scanner since this will require user input 
import java.util.Scanner; 


// Creat class for headphones 
public class HeadPhone_WK6 { 

//Call scanner 
Scanner stdin = new Scanner(System.in); 

//Initialize input variable 
int Input; 

//Declare constant Variables 
public static final int LOW = 1; 
public static final int MEDIUM = 2; 
public static final int HIGH = 3; 

//Declare Private variables 
private int volume; 
private boolean pluggedIn; 
private String manufacturer; 
private String headPhoneColor; 

//Declare Strings 
String pluggedInStat; 
String volumeNow; 


// Constructor for class 
public HeadPhone_WK6(int volume, boolean pluggedIn, String manufacturer, String headPhoneColor) { 
    this.volume = volume; 
    this.pluggedIn = pluggedIn; 
    this.manufacturer = manufacturer; 
    this.headPhoneColor = headPhoneColor; 
} 

// Default Constructor for default settings 
public HeadPhone_WK6() { 
    volume = MEDIUM; 
    pluggedIn = false; 
    manufacturer = ""; 
    headPhoneColor = ""; 
} 

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

// getVolume 
public int getVolume() { 
    if (volume == 1) { 
     volumeNow = "LOW"; 
    } 
    else if (volume == 2) { 
     volumeNow = "MEDIUM"; 
    } 
    else { 
     volumeNow = "HIGH"; 
    } 
    return volume; 
} 


// setPluggedIn 
public void setPluggedIn(boolean pluggedIn) { 
    this.pluggedIn = pluggedIn; 
} 

// getPluggedIn 
public boolean getPluggedIn() { 
    if(pluggedIn == true) { 
     pluggedInStat = "Plugged In"; 
    } 
    else { 
     pluggedInStat = "Not Plugged In"; 
    } 

    return pluggedIn; 
} 


// setManufacturer 
public void setManufacturer(String manufacturer) { 
    this.manufacturer = manufacturer; 
} 

// getManufacturer 
public String getManufacturer() { 
    return manufacturer; 
} 

// setHeadPhoneColor 
public void setHeadPhoneColor(String headPhoneColor) { 
    this.headPhoneColor = headPhoneColor; 
} 

// getHeadPhoneColor 
public String getHeadPhoneColor() { 
    return headPhoneColor; 
} 

// method to create string 
public String toString() { 

    boolean phonesPluggedIn = this.getPluggedIn(); 
    String phoneManufacturer = this.getManufacturer(); 
    String phoneColor = this.getHeadPhoneColor(); 
    String currentVolume = this.volumeNow; 

    //Build String for characteristics of phones 
    StringBuilder characteristics = new StringBuilder(); 
    characteristics.append(String.format("\nThe Head Phone Manufacturer " 
      + "is: %s", phoneManufacturer)); 
    characteristics.append(String.format("\nThe Color of the Head Phone Set " 
      + "is: %s", phoneColor)); 
    characteristics.append(String.format("\nThe Head Phones are Currently: " 
      + " %s", phonesPluggedIn)); 
    characteristics.append(String.format("\nThe Head Phone Volume is " 
      + "Currently Set on: %s", currentVolume)); 

    //return string for characteristics 
    return characteristics.toString(); 


}  

}

package headphone_wk6; 

//Import scanner since this will require user input 
import java.util.Scanner; 

//Test class for head phone 
public class HeadPhone_WK6_Test { 

//Command line arguments 
public static void main(String[] args) { 

    //Initialize input variable 
    int Input; 

    //Call scanner 
    Scanner stdin = new Scanner(System.in); 

    HeadPhone_WK6 bestPair = new HeadPhone_WK6(2, false, "SONY", "BLUE"); 
    HeadPhone_WK6 worstPair = new HeadPhone_WK6(2, false, "BOSE", "BLACK"); 
    HeadPhone_WK6 decentPair = new HeadPhone_WK6(2, false, "RCA", "ORANGE"); 

    int bestPairVolume = bestPair.getVolume(); 
    boolean bestPairPluggedIn = bestPair.getPluggedIn(); 
    String bestPairManufacturer = bestPair.getManufacturer(); 
    String bestPairHeadPhoneColor = bestPair.getHeadPhoneColor();  
    String bestPairVolumeNow = bestPair.volumeNow; 
    String bestPairPluggedInStat = bestPair.pluggedInStat; 

    int worstPairVolume = worstPair.getVolume(); 
    boolean worstPairPluggedIn = worstPair.getPluggedIn(); 
    String worstPairManufacturer = worstPair.getManufacturer(); 
    String worstPairHeadPhoneColor = worstPair.getHeadPhoneColor(); 
    String worstPairVolumeNow = worstPair.volumeNow; 
    String worstPairPluggedInStat = worstPair.pluggedInStat; 

    int decentPairVolume = decentPair.getVolume(); 
    boolean decentPairPluggedIn = decentPair.getPluggedIn(); 
    String decentPairManufacturer = decentPair.getManufacturer(); 
    String decentPairHeadPhoneColor = decentPair.getHeadPhoneColor(); 
    String decentPairVolumeNow = decentPair.volumeNow; 
    String decentPairPluggedInStat = decentPair.pluggedInStat; 

    //Introduce HeadPhone helper 
    System.out.print("Hi there! Let's have you try a pair of head phones " 
      + "on and we'll see what you think of them! \nStart by choosing a " 
      + "random pair of head phones. To do this, enter 1, 2, or 3: "); 

    //Get user input for random pair of headphones 
      Input = stdin.nextInt(); 

      //Loop for random headphone selection 
      if (Input == 1){ 

       //echo user input 
       System.out.println("You have chosen the best pair of " 
         + "headphones! Here is a list of the characteristics: "); 

       System.out.println(bestPair.toString()); 

      //End if 
      } 

      else if (Input == 2){ 
       System.out.println("You have chosen the worst pair of " 
         + "headphones. Here is a list of the characteristics: "); 

       System.out.println(worstPair.toString()); 


      //End If 
      } 

      else if(Input == 3){ 
       System.out.println("You have chosen a decent pair of " 
         + "headphones. Here is a list of the characteristics:"); 

       System.out.println(decentPair.toString()); 

      //End If  
      } 

      else{ 
       System.out.println("You have expressed that you want to see " 
         + "the default pair of headphones. They are the " 
         + "decent pair! Here's a list of the characteristics:"); 

       System.out.println(decentPair.toString()); 

      } 






} 

}

Answer 1

也許嘗試這樣的事情，首先通過掃描儀獲取輸入，然後創建耳機對象：

//Initialize input variable 
    int Input; 

    //Call scanner 
    Scanner stdin = new Scanner(System.in); 

    //Introduce HeadPhone helper 
    System.out.print("Hi there! Let's have you try a pair of head phones " 
      + "on and we'll see what you think of them! \nStart by choosing a " 
      + "random pair of head phones. To do this, enter 1, 2, or 3: "); 

    //Get user input for random pair of headphones 
    Input = stdin.nextInt(); 
    System.out.println("Now give me value of plug in 1 or 2"); 
    int plugInState = stdin.nextInt(); 
    boolean pluggedIn=true; 
    if(plugInState==1) pluggedIn = false; 
    if(plugInState==2) pluggedIn = true; 
    System.out.println("Now give me value volume (1/2/3"); 
    int volumeState = stdin.nextInt(); 
    HeadPhone_WK6 bestPair = new HeadPhone_WK6(volumeState, pluggedIn, "SONY", "BLUE"); 
    HeadPhone_WK6 worstPair = new HeadPhone_WK6(volumeState, pluggedIn, "BOSE", "BLACK"); 
    HeadPhone_WK6 decentPair = new HeadPhone_WK6(volumeState, pluggedIn, "RCA", "ORANGE"); 

你可以把if子句放到最後，根據你的input，你可以創建一個你需要的對象。如果你需要不同的方法，在主做（）：

 HeadPhone_WK6 hp = new HeadPhone_WK6(); 
    //Initialize input variable 
    int Input; 

    //Call scanner 
    Scanner stdin = new Scanner(System.in); 

    //Introduce HeadPhone helper 
    System.out.print("Hi there! Let's have you try a pair of head phones " 
      + "on and we'll see what you think of them! \nStart by choosing a " 
      + "random pair of head phones. To do this, enter 1, 2, or 3: "); 

    //Get user input for random pair of headphones 
    Input = stdin.nextInt(); 
    System.out.println("Now give me value of plug in 1 or 2"); 
    int plugInState = stdin.nextInt(); 
    hp.setPluggedIn(plugInState); 

    System.out.println("Now give me value volume (1/2/3"); 
    int volumeState = stdin.nextInt(); 
    hp.setVolume(volumeState); 
    HeadPhone_WK6 bestPair = new HeadPhone_WK6(hp.getVolume(), hp.getPluggedIn(), "SONY", "BLUE"); 
    HeadPhone_WK6 worstPair = new HeadPhone_WK6(hp.getVolume(), hp.getPluggedIn(), "BOSE", "BLACK"); 
    HeadPhone_WK6 decentPair = new HeadPhone_WK6(hp.getVolume(), hp.getPluggedIn(), "RCA", "ORANGE"); 

凡

setPluggedIn(int pluggedInState) { if(plugInState==1) pluggedIn = false; else if(plugInState==2) pluggedIn = true; else { pluggedIn = false; } }