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我看过关于此异常的其他问题,但似乎常见的问题是扫描程序过早关闭,但在此情况并非如此。这里是我的代码,这个问题线以上评论:扫描程序在调用next()时抛出NoSuchElementException()
public void windowOpened(WindowEvent arg0) {
Scanner input = null;
try {
input = new Scanner(new File("/home/brian/workspace/Color Sampler/src/Data.txt"));
} catch (FileNotFoundException e) {
System.exit(1);
}
int i = 0;
int nR, nG, nB;
String nName;
while(input.hasNextLine())
{
// These lines are throwing the exception
nName = input.next();
nR = input.nextInt();
nG = input.nextInt();
nB = input.nextInt();
ColorSampler.colors[i] = new myColor(nName, nR, nG, nB);
i++;
}
ColorSampler.currentColor = ColorSampler.colors[0];
System.out.println(ColorSampler.currentColor.red);
}
这是我收到的例外:
Exception in thread "AWT-EventQueue-1" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:855)
at java.util.Scanner.next(Scanner.java:1364)
at WindowDestroyer.windowOpened(WindowDestroyer.java:57)
at java.awt.Window.processWindowEvent(Window.java:1972)
at javax.swing.JFrame.processWindowEvent(JFrame.java:290)
at java.awt.Window.processEvent(Window.java:1933)
at java.awt.Component.dispatchEventImpl(Component.java:4649)
at java.awt.Container.dispatchEventImpl(Container.java:2103)
at java.awt.Window.dispatchEventImpl(Window.java:2588)
at java.awt.Component.dispatchEvent(Component.java:4475)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:675)
at java.awt.EventQueue.access$300(EventQueue.java:96)
at java.awt.EventQueue$2.run(EventQueue.java:634)
at java.awt.EventQueue$2.run(EventQueue.java:632)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:108)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:119)
at java.awt.EventQueue$3.run(EventQueue.java:648)
at java.awt.EventQueue$3.run(EventQueue.java:646)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:108)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:645)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)
我想不出什么会在这里是问题。有人可以帮忙吗?
您的'Scanner'对象可能没有包含try/catch中指定的值。在你的while循环之前做一个'System.out.println(scanner.hasNext());'来测试。如果它是“真的”,那么你知道问题在哪里。 – 2014-12-03 16:21:06
我意外地从前一次运行中提供了错误的异常消息。我在我的问题中修改了它。 – Bobazonski 2014-12-03 16:23:52
它看起来像你的文件以空行结束,它不包含导致'next()'抛出'NoSuchElementException'的任何数据。 – Pshemo 2014-12-03 16:24:31