如何从JList填充GUI字段 [英] How to Populate GUI Fields from JList
问题描述
我是初学者，仍然在我的第一个Java课程中，所以我希望这个问题不是冒犯任何人这么简单，但我正在完成我的CD库存计划。
添加一些用于操作JList中数据的GUI按钮。
JList超出了我的课程范围，所以我很难找到帮助。
我只剩下两个星期的课程了，所以现在回到我的阵列已经太晚了。
这是沉没或游泳我拥有的东西。 ：o）
对于我的问题...我有一个像魅力一样的ADD按钮，从我的字段中填充JList。我现在正在使用PREV按钮将信息拉回到前一张CD的字段中。我已编码和编码，但我显然做错了，因为它在执行时一直出错。
编译好，但不会运行。继续获取：
线程中的异常AWT-EventQueue-0 java.lang.NumberFormatException：对于输入字符串：""
at java.lang.NumberFormatException.forInputString（Num berFormatException.java:48）
at java.lang .Integer.parseInt（Integer.java:468）
at java.lang.Integer.parseInt（Integer.java:497）
at Inventory2.btnAddActionPerformed（Inventory2.java ：2 55）
在Inventory2.access $ 000（Inventory2.java:10）
在Inventory2 $ 2.actionPerformed（Inventory2.java:155）
at javax.swing.AbstractButton.fireActionPerformed（Abs tractButton.java:1849）
at javax.swing.AbstractButton $ Handler.actionPerformed（AbstractButton.java:2169)
在javax.swing.DefaultButtonModel.fireActionPerformed（DefaultButtonModel.java:420）
在javax.swing.DefaultButtonModel.setPressed（DefaultB uttonModel.java:258）
在javax租用.swing.plaf.basic.BasicButtonListener.mouseRe（BasicButtonListener.java:236）
java.awt.Component.processMouseEvent（Com）中的
ponent.jav a：5517）
at javax.swing.JComponent.processMouseEvent（JComponen t.java:3135）
at java.awt.Component.processEvent（Component。 java：528 2）
at java.awt.Container.processEvent（Container.java:196 6）
at java.awt.Component.dispatchEventImpl（Component.jav a ：3984）
at java.awt.Container.dispatchEventImpl（Container.jav a：2024）
at java.awt.Component.dispatchEvent（Component.java:38 19 ）
在java.awt.LightweightDispatcher.retargetMouseEvent（Container.java:4212）
at java.awt.LightweightDispatcher.processMouseEvent（C ontainer.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent（Conta iner.java:3822)
at java.awt.Container.dispatchEventImpl（Container.jav a：2010）
at java.awt.Window.dispatchEventImpl（Window.java:1791）
at java.awt.Component.dispatchEvent（Component.java:38 19）
在java.awt.EventQueue.dispatchEvent（EventQueue.java： 463）
at java.awt.EventDispatchThread.pumpOneEventForHierar chy（EventDispatchThread.java:242）
at java.awt.EventDispatchThread.pumpEventsForHierarch y（EventDispatchThread.java:163）
at java.awt.EventDispatchThread.pumpEvents（EventDispa tchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents（EventDispa tchThread.java:149)
在java.awt.EventDispatchThread.run（EventDispatchThre ad.java:110）
这是我的代码。一切都有效，除了上一个按钮动作事件。
有什么建议吗？
I am a beginner here, still in my first Java class, so I hope this question is not so simple as to offend anyone, but I am finishing up my cd inventory program.
Adding some GUI buttons to manipulate data in my JList.
JList is beyond the scope of my class so I am finding help hard to come by.
I only have two weeks of class left, so it is too late to go back to my array now.
It is sink or swim with what I have. :o)
For my question ... I have an ADD button that works like a charm, populates JList from my fields. I am now working on the PREV button to pull the information back to the fields from the previous cd. I have coded and coded but I am obviously doing something wrong because it keeps erroring upon execution.
Compiles fine, but will not run. Keep getting:
Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(Num berFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:468)
at java.lang.Integer.parseInt(Integer.java:497)
at Inventory2.btnAddActionPerformed(Inventory2.java:2 55)
at Inventory2.access$000(Inventory2.java:10)
at Inventory2$2.actionPerformed(Inventory2.java:155)
at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed (AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.jav a:5517)
at javax.swing.JComponent.processMouseEvent(JComponen t.java:3135)
at java.awt.Component.processEvent(Component.java:528 2)
at java.awt.Container.processEvent(Container.java:196 6)
at java.awt.Component.dispatchEventImpl(Component.jav a:3984)
at java.awt.Container.dispatchEventImpl(Container.jav a:2024)
at java.awt.Component.dispatchEvent(Component.java:38 19)
at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:3822)
at java.awt.Container.dispatchEventImpl(Container.jav a:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1791 )
at java.awt.Component.dispatchEvent(Component.java:38 19)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 463)
at java.awt.EventDispatchThread.pumpOneEventForHierar chy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:110)
Here is my code. Everything works except the Previous Button action event.
Any suggestions?
推荐答案
000（Inventory2.java:10）
在Inventory2的
000(Inventory2.java:10)
at Inventory2
2.actionPerformed（Inventory2.java:155）
at javax.swing.AbstractButton.fireActionPerformed（Abs tractButton.java:1849）
at javax.swing.AbstractButton
2.actionPerformed(Inventory2.java:155)
at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:1849)
at javax.swing.AbstractButton
Handler.actionPerformed（AbstractButton .java：2169）
at javax.swing.DefaultButtonModel .fireActionPerformed（DefaultButtonModel.java:420）
at javax.swing.DefaultButtonModel.setPressed（DefaultB uttonModel.java:258)
at javax.swing.plaf.basic。 BasicButtonListener.mouseRe租用（BasicButtonListener.java:236）
在java.awt.Component.processMouseEvent（Component.jav a：5517）
在javax.swing.JComponent。 processMouseEvent（JComponen t.java:3135）
at java.awt.Component.processEvent（Component.java:528 2）
at java.awt.Container.processEvent（ Container.java:196 6）
at java.awt.Component.dispatchEventImpl（Component.jav a：3984）
at java.awt.Container.dispatchEventImpl（Container。 jav a：2024）
at java.awt.Component.dispatchEvent（Component.java:38 19）
at java.awt.LightweightDispatcher.retargetMouseEvent（Container.java： 4212）
在java.awt.LightweightDispatcher.processMouseEvent（C ontainer.java:3892）
at java.awt.LightweightDispatcher.dispatchEvent（Conta iner.java:3822)
at java.awt.Container.dispatchEventImpl（Container.jav a：2010）
at java.awt.Window.dispatchEventImpl（Window.java ：1791）
at java.awt.Component.dispatchEvent（Component.java:38 19）
at java.awt.EventQueue.dispatchEvent（EventQueue.java:463）
at java.awt.EventDispatchThread.pumpOneEventForHierar chy（EventDispatchThread.java:242）
at java.awt.EventDispatchThread.pumpEventsForHierarch y（EventDispatchThread.java:163)< />
在java.awt.EventDispatchThread.pumpEvents（EventDispa tchThread.java:157）
at java.awt.EventDispatchThread.pumpEvents（EventDispa tchThread.java:149）
java.awt.EventDispatchThread.run上的
（EventDispatchThre ad.java:110）
这是我的代码。一切都有效，除了上一个按钮动作事件。
有什么建议吗？
Handler.actionPerformed (AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.jav a:5517)
at javax.swing.JComponent.processMouseEvent(JComponen t.java:3135)
at java.awt.Component.processEvent(Component.java:528 2)
at java.awt.Container.processEvent(Container.java:196 6)
at java.awt.Component.dispatchEventImpl(Component.jav a:3984)
at java.awt.Container.dispatchEventImpl(Container.jav a:2024)
at java.awt.Component.dispatchEvent(Component.java:38 19)
at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:3822)
at java.awt.Container.dispatchEventImpl(Container.jav a:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1791 )
at java.awt.Component.dispatchEvent(Component.java:38 19)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 463)
at java.awt.EventDispatchThread.pumpOneEventForHierar chy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:110)
Here is my code. Everything works except the Previous Button action event.
Any suggestions?
这篇关于如何从JList填充GUI字段的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
