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用InputDialog读取用户输入，但出问题了？高手帮忙看一下，不胜感激

tuutoo

发贴: 3
积分: 0

于 2006-04-13 16:57

我想用对话框读取用户输入的数，并转为数字赋值给变量！但出问题了：下面是代码，textFeeO是一个textField对象。
public void buttonSetEvt(){
      String inputSet=JOptionPane.showInputDialog("设定原始的成本(单位:元/小时)");
      try{
        Integer numInputSet=Integer.parseInt(inputSet);
        textFeeO.setText(inputSet);
      }catch (NumberFormatException e){}
    }

上面的"Integer numInputSet=Integer.parseInt(inputSet);"如果换成"Float numInputSet=Float.parseFloat(inputSet);"一点“取消"就会出现如下的错误（用Integer没有问题）：

E:\Java>java myProject
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
at java.lang.Float.valueOf(Unknown Source)
at subComponent$buttonAction.buttonSetEvt(myProject.java:120)
at subComponent$buttonAction.actionPerformed(myProject.java:134)
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 Sour
ce)
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.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

tuutoo edited on 2006-04-13 17:05

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人气	标题	作者	字数	发贴时间
5112	用InputDialog读取用户输入，但出问题了？高手帮忙看一下，不胜感激	tuutoo	2686	2006-04-13 16:57

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