Java - 更改数据字段？
Java - changing data fields?
有两件事我需要帮助，但我很难搞清楚。它们在下面列出 - 非常感谢任何帮助。
1) 我需要添加一个方法，提示用户输入一个整数 (1-3) 来更改音量（默认设置为 2）。我真的很难弄清楚如何进行这项工作。
2) 我需要添加一个类似的方法，提示用户输入一个整数（1 或 2）来插入耳机。
这是我的代码；一个是测试 class:
//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());
}
}
}
也许可以尝试这样的方法，首先通过扫描仪获取输入，然后创建 HeadPhone 对象：
//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子句放在最后，根据你的input，你可以创建一个你需要的对象。如果您需要单独的方法，请在 main():
中执行此操作
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");
在哪里
setPluggedIn(int pluggedInState) {
if(plugInState==1) pluggedIn = false;
else if(plugInState==2) pluggedIn = true;
else {
pluggedIn = false;
}
}
有两件事我需要帮助，但我很难搞清楚。它们在下面列出 - 非常感谢任何帮助。
1) 我需要添加一个方法，提示用户输入一个整数 (1-3) 来更改音量（默认设置为 2）。我真的很难弄清楚如何进行这项工作。
2) 我需要添加一个类似的方法，提示用户输入一个整数（1 或 2）来插入耳机。
这是我的代码；一个是测试 class:
//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());
}
}
}
也许可以尝试这样的方法，首先通过扫描仪获取输入，然后创建 HeadPhone 对象：
//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子句放在最后，根据你的input，你可以创建一个你需要的对象。如果您需要单独的方法，请在 main():
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");
在哪里
setPluggedIn(int pluggedInState) {
if(plugInState==1) pluggedIn = false;
else if(plugInState==2) pluggedIn = true;
else {
pluggedIn = false;
}
}