找不到无限循环但它是运行一个？

Question

我只使用了整个程序的一部分，但我 100% 确定它就在这个方法中。

public void draw() 
{
    int count;
    int arrowHeadRight = getIndentationLevel() 
            + getBaseLength() / 2;
    for (count = 0; count < arrowHeadRight; count++)
    {
        System.out.print(' ');
    }
    System.out.println(drawingCharacter);
    int baseAtCenter = getBaseLength() / 2 - 1;
    int arrowHeadLeft = 1;
    for (count = 1; count <= baseAtCenter; count++)
    {
        for (count = 0; count < arrowHeadRight--; count++)
        {
            System.out.print(' ');
        }
        System.out.print(drawingCharacter);
        for (count = 0; count < arrowHeadLeft; count++)
        {
            System.out.print(' ');
        }
        System.out.print(drawingCharacter);
        arrowHeadLeft = arrowHeadLeft + 2;
    }
    for (count = 0; count < arrowHeadRight--; count++)
    {
        System.out.print(' ');
    }
    for (count = 1; count <= getBaseLength(); count++)
    {
        System.out.print(drawingCharacter);
    }
    System.out.print("\n");
    //Arrow Shaft
    for (count = 1; count <= shaftLength; count++)
    {
        for (count = 0; count < arrowHeadRight; count++)
        {
            System.out.print(' ');
        }
        System.out.println(drawingCharacter);
    }
}

现在假设for循环中的所有变量都大于count变量，哪里会出现死循环呢？我已经检查了很多次了，我的眼睛受伤了，再看看这个会有所帮助。

Answer 1

这是你的无限循环：

for (count = 1; count <= shaftLength; count++)
    {
        for (count = 0; count < arrowHeadRight; count++)
        {

每次内循环终止时，count 将等于 arrowHeadRight。如果 arrowHeadRight <= shaftLength 那么外循环将永远不会终止。

Answer 2

这是有问题的部分代码：

for (count = 1; count <= shaftLength; count++)
{
    for (count = 0; count < arrowHeadRight; count++)
    {
        System.out.print(' ');
    }
    System.out.println("drawingCharacter");
}

您正在开始一个索引为 count=1 的 for 循环，然后在其中开始另一个循环，将索引 count 设为 0。在内部循环之后，count 现在将等于 arrowHeadRight，不是你进入循环时的样子。

你的整个方法都是类似的例子。

解决方案是在像这样使用嵌套 for 循环时使用不同的索引变量：

for (count = 1; count <= shaftLength; count++)
    {
        for (int count2 = 0; count2 < arrowHeadRight; count2++)
        {
            System.out.print(' ');
        }
        System.out.println(drawingCharacter);
    }

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