Question

我正在完成一项学校作业。

作业是制作一个随机选择一个数字的程序，用户必须猜出这个数字。

程序应该保持用户提交输入的次数的计数（count var）。

我知道计数器被重置的问题来自方法的初始化步骤....如果我的count变量的值高于0，有没有办法绕过初始化步骤？

我已在下面提交了我的代码：

    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;
    }
}

Answer 1

使count变量成为类成员：

public:
    static int count;

然后在GuessMachine中，使用相同的名称删除局部变量。

Answer 2

您在整个代码中所做的是错误输入 count = + 1; 此外，必须将count变量声明为类属性 public static int count = 0;
此外，您在调用CallPane（）方法后递增计数，因此它永远无法递增！

这是错误，因此每次都会重置！用 count + = 1; 替换此语句，此外，还要通过从类中的任何位置递增来声明count as static。它会工作正常！我已在下面显示： -

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;
 }

}

Answer 3

像shekhar一样，您需要将代码更新为count +=1或安全count = count + 1
就像CDahn所说，变量count需要是静态的，因为它必须保持对函数调用的价值
每次调用GuessMachine时，计数都会重置。想一想GuessMachine将如何被一次又一次地召唤。这意味着您将一次又一次地在函数count = 0的顶部执行GuessMachine。您需要将count = 0初始化为函数GuessMachine并进入函数main，因为即使您将其设置为静态，如果每次调用GuessMachine时都初始化它，{ {1}}将继续重置。
您的代码还有另一个问题。在count中的if块中，有3次中有2次，GuessMachine增加的方式为时已晚。它需要立即增加。事实上，它是完全相同的代码段，因此我们可以将其从count块
中取出
```
if
```

我建议你逐步完成这个计划。尝试“干运行”并尝试使用调试器逐步执行每个语句，并了解此代码的控制流程。看起来你需要大量的练习来理解如何设计代码并对其进行调试。

Answer 4

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count变量时，我都会通过方法incrementalCount（）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);

            }

        ...
    }    
}

...

}

计数器重置java

4 个答案: