Question

我有几个字符串变量，并且在我将它们转换为整数之后，我试图将它们放入while子句中。

以下实际代码：

public void setUp()
    {
        String HText = "";
        int CorrectAnswer = Integer.parseInt(Levels.CorrectAnswer);
        int Question1 = Integer.parseInt(Levels.Question1);
        int Remaining = CorrectAnswer - Question1;
        TextView TVHint = (TextView) findViewById(R.id.hint);
        //HintText.setText(String.valueOf(Remaining));
        /*while (Remaining != 0)
        {*/
            if (Remaining >= 100)
            {
                Remaining = Remaining - 100;
                if (HText != "")
                {
                    HText = HText + " + " + "100";
                }
                else
                {
                    HText = "100";
                }
            }
            else
            {
                if (Remaining >= 10)
                {
                    Remaining = Remaining - 10;
                    if (HText != "")
                    {
                        HText = HText + " + " + "10";
                    }
                    else
                    {
                        HText = "10";
                    }
                }
                else
                {
                    if (Remaining >= 5)
                    {
                        Remaining = Remaining - 5;
                        if (HText != "")
                        {
                            HText = HText + " + " + "5";
                        }
                        else
                        {
                            HText = "5";
                        }
                    }
                    else
                    {
                        if (Remaining >= 1)
                        {
                            Remaining--;
                            if (HText != "")
                            {
                                HText = HText + " + " + "1";
                            }
                            else
                            {
                                HText = "1";
                            }
                        }
                    }
                }
            }
        //}
        TVHint.setText(HText);
    }

此代码可以使用，但我希望它重复，直到剩余为0并且当时注释掉的内容目前无效。

Answer 1

请尝试Integer.parseInt(var1)。

Answer 2

你的程序进入无限循环。因为您将var1Int的值设置为等于1，并且在while循环中条件为

while (var1Int != 0)

即。当var1Int变为等于0时，它将从循环中出来，因为循环变量var1Int的值没有改变，所以它永远不会发生。因此循环继续无限执行。您应该编写代码来更改var1Int的值，以便满足退出条件。例如，您可以尝试这个

String var1 = "1";
int var1Int = Integer.valueOf(var1);
while (var1Int != 0)
{
var1Int --;
}

这将使var1Int值等于0，这是终止条件，它将退出循环。这只是一个示例，您可以根据您的要求编写逻辑。问题不在于将String解析为int。如果是这种情况，它只会在下一行给出错误。

int var1Int = Integer.valueOf(var1);

Answer 3

它没有失败，循环工作正常，因为它是无限循环它将继续“永远”，尝试打印出来的东西，你会看到。

如果你想突破它只是减少你的价值，最终它会达到0：

while(a != 0){
  System.out.println(var1Int);//so you can check the difference
  var1Int--;
}

Answer 4

确保Levels.CorrectAnswer和Levels.Question1包含integer值的有效字符串。


例如：

Levels.CorrectAnswer值为"110"和Levels.Question1值   是"1"
使用Math.abs(CorrectAnswer - Question1)获取绝对Remaining值。
```
int Remaining = Math.abs(CorrectAnswer - Question1);
```
添加一些logs以检查Remaining和HText的值。

以下是工作代码：

public void setUp()
{
    Levels Levels = new Levels();

    String HText = "";
    int CorrectAnswer = Integer.parseInt(Levels.CorrectAnswer);
    int Question1 = Integer.parseInt(Levels.Question1);
    int Remaining = CorrectAnswer - Question1;

    Log.d("setUp", "CorrectAnswer: " + CorrectAnswer + "\n"
            + "Question1: " + Question1 + "\n" + "Remaining: " + Remaining);

    TextView TVHint = (TextView) findViewById(R.id.hint);
    while (Remaining != 0)
    {
        Log.d("setUp", "Remaining: " + Remaining);
        if (Remaining >= 100)
        {
            Remaining = Remaining - 100;
            Log.d("setUp", "Remaining - 100: " + Remaining);

            if (HText != "")
            {
                HText = HText + " + " + "100";
            }
            else
            {
                HText = "100";
            }
        }
        else
        {
            if (Remaining >= 10)
            {
                Remaining = Remaining - 10;
                Log.d("setUp", "Remaining - 10: " + Remaining);

                if (HText != "")
                {
                    HText = HText + " + " + "10";
                }
                else
                {
                    HText = "10";
                }
            }
            else
            {
                if (Remaining >= 5)
                {
                    Remaining = Remaining - 5;
                    Log.d("setUp", "Remaining - 5: " + Remaining);

                    if (HText != "")
                    {
                        HText = HText + " + " + "5";
                    }
                    else
                    {
                        HText = "5";
                    }
                }
                else
                {
                    if (Remaining >= 1)
                    {
                        Remaining--;
                        Log.d("setUp", "Remaining - 1: " + Remaining);

                        if (HText != "")
                        {
                            HText = HText + " + " + "1";
                        }
                        else
                        {
                            HText = "1";
                        }
                    }
                }
            }
        }
        Log.d("setUp", "HText: " + HText);
    }
    TVHint.setText(HText);
}

输出日志：

04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: CorrectAnswer: 110
                                                                        Question1: 1
                                                                        Remaining: 109
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: Remaining: 109
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: Remaining - 100: 9
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: HText: 100
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: Remaining: 9
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: Remaining - 5: 4
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: HText: 100 + 5
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: Remaining: 4
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: Remaining - 1: 3
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: HText: 100 + 5 + 1
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: Remaining: 3
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: Remaining - 1: 2
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: HText: 100 + 5 + 1 + 1
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: Remaining: 2
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: Remaining - 1: 1
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: HText: 100 + 5 + 1 + 1 + 1
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: Remaining: 1
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: Remaining - 1: 0
04-18 20:39:52.634 23432-23432/com.ferdous.stackoverflowanswer D/setUp: HText: 100 + 5 + 1 + 1 + 1 + 1

希望这会有所帮助〜

在将字符串转换为int之后

4 个答案: