计数器重置为java

3 月，1 周 Questions & Answers 1325

我正在做一项学校作业

任务是制作一个随机选择一个数字的程序，用户必须猜测该数字

程序应该保留用户提交输入的次数计数（count var）

我知道计数器被重置的问题来自方法的初始化步骤。。。。如果my count变量的值大于0，是否有方法绕过初始化步骤

我已提交我的代码如下：

    public static void main(String[] args) {

        Random rand = new Random();
        int randomnumber = rand.nextInt(50);

        int machine = GuessMachine(Integer.parseInt(JOptionPane.showInputDialog("gok een getal")), randomnumber);

    }

    public static int CallPane(int Value, int rndNumber) {
        int X1;
        X1 = Integer.parseInt(JOptionPane.showInputDialog("gok een getal3"));
        int machine = GuessMachine(X1, rndNumber);
        return X1;
    }


    public static int GuessMachine(int InputNumber, int rndNumber) {
        int value = InputNumber;
        int randomNumber = rndNumber;
        int count=0;


        if (InputNumber == randomNumber) {
            count =+1;
            JOptionPane.showMessageDialog(null, "Goed! Je deed er "+count+" keer " );

            int Response = JOptionPane.showConfirmDialog(null, "Nog een keer spelen?", "Bevestigen",

                   JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);

            if (Response == JOptionPane.NO_OPTION) {
                JOptionPane.showMessageDialog(null, "tot de volgende keer");
            } 
            else if (Response == JOptionPane.YES_OPTION) {
                Random rand = new Random();
                int randomnumber = rand.nextInt(50);
                //callpane
                int machine = GuessMachine(Integer.parseInt(JOptionPane.showInputDialog("gok een getal")), randomnumber);

            }

        }
        else if (InputNumber < randomNumber) {
            JOptionPane.showMessageDialog(null, "te weinig");

            int PaneInput = CallPane(value, randomNumber);
            count+=1;
        } 
       else if (InputNumber > randomNumber) {
            // JOptionPane.showMessageDialog(null,"teveel", "information", >INFORMATION_MESSAGE);
           JOptionPane.showMessageDialog(null, "teveel");
        int PaneInput = CallPane(value, randomNumber);
         count=+1;
      }



      return value;

   }

----建议后更新代码---

   public static int count=0;
    public static void main(String[] args) {
        // TODO code application logic here

        Random rand = new Random();
        int randomnumber = rand.nextInt(50);

        int machine = GuessMachine(Integer.parseInt(JOptionPane.showInputDialog("gok een getal")), randomnumber);
 JOptionPane.showMessageDialog(null, count);
    }

    public static int CallPane(int Value, int rndNumber) {
        int X1;
        X1 = Integer.parseInt(JOptionPane.showInputDialog("gok een getal3"));
        int machine = GuessMachine(X1, rndNumber);
        return X1;
    }


    public static int GuessMachine(int InputNumber, int rndNumber) {
        int value = InputNumber;
        int randomNumber = rndNumber;



        if (InputNumber == randomNumber) {
            count +=1;
            JOptionPane.showMessageDialog(null, "Goed! Je deed er "+count+" keer " );

            int Response = JOptionPane.showConfirmDialog(null, "Nog een keer spelen?", "Bevestigen",
                    JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);

            if (Response == JOptionPane.NO_OPTION) {
                JOptionPane.showMessageDialog(null, "tot de volgende keer");
            } 
            else if (Response == JOptionPane.YES_OPTION) {
                Random rand = new Random();
                int randomnumber = rand.nextInt(50);
                //callpane
                int machine = GuessMachine(Integer.parseInt(JOptionPane.showInputDialog("gok een getal")), randomnumber);

            }

        }
        else if (InputNumber < randomNumber) {
            JOptionPane.showMessageDialog(null, "te weinig");

            int PaneInput = CallPane(value, randomNumber);
            count+=1;
        } 
        else if (InputNumber > randomNumber) {
            // JOptionPane.showMessageDialog(null,"teveel", "information", INFORMATION_MESSAGE);
            JOptionPane.showMessageDialog(null, "teveel");

            int PaneInput = CallPane(value, randomNumber);
            count+=1;
        }

        return value;
    }
}

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共 (4) 个答案

# 1 楼答案
将count变量设为类成员：
```
public:
    static int count;
```
然后在GuessMachine中删除同名的局部变量
# 2 楼答案
1. 就像shekhar说的，你需要更新代码，使之成为count +=1或者是安全的count = count + 1
2. 正如CDahn所说，变量count需要是静态的，因为它必须在调用函数时保持值
3. 每次调用GuessMachine时，计数都会被重置。想一想GuessMachine将如何一次又一次地被呼叫。这意味着您将一次又一次地在函数GuessMachine的顶部执行count = 0。您需要将count = 0的初始化从函数GuessMachine中取出，放入函数main中，因为即使在将其设置为静态之后，如果每次调用GuessMachine时都对其进行初始化，count仍将被重置
4. 你的代码还有一个问题。在GuessMachine2中的if块中，共有3次，count的增量太晚了。它需要立即递增。事实上，它是同一段代码，所以我们可以将其从if块中取出
```
public static int GuessMachine(int InputNumber, int rndNumber) {
    int value = InputNumber;
    int randomNumber = rndNumber;
    count = count + 1;
    if (InputNumber == randomNumber) {
        // count +=1; No need for this statement anymore because we moved it out.
        ...
```
我建议你逐步完成这个项目。尝试“干运行”，并尝试使用调试器单步执行每一条语句，以了解此代码的控制流。似乎你需要大量的实践来理解如何设计代码和调试它

# 3 楼答案

您在整个代码中所做的是，您错误地键入了count=+1此外，count变量必须声明为class属性，即public static int count=0
此外，在调用CallPane（）方法后，您正在增加count，因为它永远无法增加

这就是错误，因此每次都会重置！将此语句替换为count+=1此外，还声明count as static要通过从类中的任何位置递增来更新。会很好用的！我在下面展示了：

public class JavaApplication5 {

public static int count=0;

public static void main(String[] args) {
Random rand = new Random();
int randomnumber = rand.nextInt(50);
System.out.println("The random number is "+randomnumber);
int machine = GuessMachine(Integer.parseInt(JOptionPane.showInputDialog("Guess a number :- ")), randomnumber);
}

public static int CallPane(int Value, int rndNumber) {
int X1;
X1 = Integer.parseInt(JOptionPane.showInputDialog("Guess a number :- "));
int machine = GuessMachine(X1, rndNumber);
return X1;
}

public static int GuessMachine(int InputNumber, int rndNumber) {
int value = InputNumber;
int randomNumber = rndNumber;
if(InputNumber == randomNumber) {
    count +=1;//error 1
    JOptionPane.showMessageDialog(null, "Well! You did it "+count+" times." );
    int Response = JOptionPane.showConfirmDialog(null, "Play again", "Confirm",
           JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
    if (Response == JOptionPane.NO_OPTION) {
        JOptionPane.showMessageDialog(null, "See you later!");
    } 
    else if (Response == JOptionPane.YES_OPTION) {
        Random rand = new Random();
        int randomnumber = rand.nextInt(50);
        //callpane
        int machine = GuessMachine(Integer.parseInt(JOptionPane.showInputDialog("Guess a number :- ")), randomnumber);
    }
}
    else if (InputNumber < randomNumber) {
    JOptionPane.showMessageDialog(null, "Insufficient!");
    count+=1;//error 2
    int PaneInput = CallPane(value, randomNumber);
} 
    else if (InputNumber > randomNumber) {
    // JOptionPane.showMessageDialog(null,"teveel", "information", >INFORMATION_MESSAGE);
   JOptionPane.showMessageDialog(null, "Excess!");
   count+=1;//error 3
   int PaneInput = CallPane(value, randomNumber);
   }
  return value;
 }

}

# 4 楼答案

初始化count变量的方法如下所示：我做了一个count变量和两个方法initializeCount（）和incrementalCount（）。每次我得到一个计数变量时，我都会通过方法incrementalCount（）添加1来更新它。当我需要再次初始化变量时，我使用initializeCount（）

public class YourClass {

private static int count = 0;

public static void initializeCount(){
    this.count = 0;
}

public static int incrementalCount(){
   this.count++;
}

public static void main(String[] args) {

Random rand = new Random();
int randomnumber = rand.nextInt(50);

initializeCount(); // for initializing the count variable    

int machine = GuessMachine(Integer.parseInt(JOptionPane.showInputDialog("gok een getal")), randomnumber);

}

...

//Then you can use.
public static int GuessMachine(int InputNumber, int rndNumber) {
    int value = InputNumber;
    int randomNumber = rndNumber;
    // int count=0;

    if (InputNumber == randomNumber) {

        JOptionPane.showMessageDialog(null, "Goed! Je deed er "+incrementalCount()+" keer " );

        .... 

        else if (Response == JOptionPane.YES_OPTION) {
                Random rand = new Random();
                int randomnumber = rand.nextInt(50);

                initializeCount(); // for initializing the count variable    

                //callpane
                int machine = GuessMachine(Integer.parseInt(JOptionPane.showInputDialog("gok een getal")), randomnumber);

            }

        ...
    }    
}

...

}

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计数器重置为java

共 (4) 个答案

# 1 楼答案

# 2 楼答案

# 3 楼答案

# 4 楼答案