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我在做什么：在下面的代码片段中，我打印出条形图的 X 轴，这取决于不同长度的单词数量。例如，最大字的长度为 6，因此 X 轴沿底部有 1、2、3、4、5、6。

问题是什么：代码完全正常，但是我的paint方法返回了一个错误。

我已经尝试过：通过将代码块制作成在paint方法中调用的方法来隔离导致问题的代码行。

使用的变量：

lengthCountArray.length（数组长度表示底部有多少个数字）

int canvasWidth = 410; 
int inferiorLeftCornerX = 50; // this the the x point of the left corner on the x axis
int inferiorLeftCornerY = 470; // this the the y point of the left corner on the x axis
int barWidth = canvasWidth / lengthCountArray.length; // this calculates the distance for the bars
int posLabelX = barWidth / 2; // this puts the label in the centre of the bars by halving it 
posLabelX = inferiorLeftCornerX - posLabelX; // this is so that the initial number isn't indented twice

for (int a = 1; a <  (lengthCountArray.length+1); a++){
    posLabelX = posLabelX + barWidth;
    g.drawString(String.valueOf(a), posLabelX, inferiorLeftCornerY);
}

导致问题的行是“int barWidth = canvasWidth / lengthCountArray.length; // 这会计算条的距离”（第 122 行）。

返回以下错误：

Exception in thread "AWT-EventQueue-1" java.lang.ArithmeticException: / by zero
    at java_assignment.JavaAppletMain.paint(JavaAppletMain.java:122)
    at sun.awt.RepaintArea.paintComponent(RepaintArea.java:264)
    at sun.lwawt.LWRepaintArea.paintComponent(LWRepaintArea.java:54)
    at sun.awt.RepaintArea.paint(RepaintArea.java:240)
    at sun.lwawt.LWComponentPeer.handleJavaPaintEvent(LWComponentPeer.java:1267)
    at sun.lwawt.LWComponentPeer.handleEvent(LWComponentPeer.java:1150)
    at java.awt.Component.dispatchEventImpl(Component.java:4937)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:694)
    at java.awt.EventQueue$3.run(EventQueue.java:692)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:708)
    at java.awt.EventQueue$4.run(EventQueue.java:706)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

在导致 StackOverflow 之前，我一直在尝试解决这个问题几个小时，所以如果您需要更多信息，请随时询问！

感谢您查看我的问题。

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1 回答 1

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虽然我不想实现随机的 if 语句，但我必须抵消除以 0。if 语句如下：

if (lengthCountArrayLength == 0){
            lengthCountArrayLength = 1;
        }

谢谢您的意见。如果您找到更好的方法，请发表评论或留下答案！

于 2014-03-09T18:57:29.890 回答