小编Jac*_*ken的帖子

我在IDLE中编写了一个程序来标记文本文件,它开始标记349个文本文件!我怎么能阻止它？如何停止正在运行的Python程序？

我正在用Java制作一个计时器,我需要帮助.主类增加了一个挥杆计时器.我有一个jFrame,有2个面板,1个有jLabel,另一个有3个按钮,"开始","停止"和"重置".当我点击开始然后一切正常,当我停止然后重置.但当我再次点击start时,它会抛出这个异常:

Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Timer already                                       cancelled.
at java.util.Timer.sched(Unknown Source)
at java.util.Timer.schedule(Unknown Source)
at org.stopwatch.Stopwatch.start(Stopwatch.java:71)
at org.stopwatch.Stopwatch$1.actionPerformed(Stopwatch.java:48)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at …

我正在使用ruby的改进来将一个方法修改为Math类,如下所示:

module Radians
  refine Math do
    def radians(degrees)
      degrees * Math::PI / 180
    end
  end
end

然后我尝试在类中调用我的猴子修补方法:

class Foo
  using Radians
  def bar
    Math.radians(180)
  end
end

Foo.new.bar

这引发了 undefined method `radians' for Math:Module (NoMethodError)

我究竟做错了什么？我的红宝石版本是2.5.1p57.我已经查阅了文档,我认为我所做的是正确的,但显然不是.

我正在编写一个小的 go 应用程序，它在 main.go 中定义了一些全局常量，如下所示：

main.go

package main

import (
    "github.com/JackBracken/global/sub"
)

const AppName string = "global string"

func main() {
    sub.Run()
}

子/子.go

package sub

import "fmt"

func Run() {
    fmt.Println(AppName)
}

我对 Go 还很陌生，希望这样的事情能正常工作，但go build会引发错误sub/sub.go:6: undefined: AppName。

我知道我可以做一些事情，比如创建一个globals包，导入它sub.go并用globals.AppName等等来引用我的全局变量，但我想知道这是否可能是我原来的方式，或者我只是完全误解了范围和包？