我怎么能解决这个问题？ [英] How I Can Solve This Execption ?

问题描述

当我点击此按钮时，它显示给定的异常

when i click this button it show the given exception

private void btnmathActionPerformed(java.awt.event.ActionEvent evt) {
new Questions().setVisible(true);

       this.dispose();
}

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at java.awt.GridBagConstraints.clone(GridBagConstraints.java:652)
	at java.awt.GridBagLayout.setConstraints(GridBagLayout.java:499)
	at java.awt.GridBagLayout.addLayoutComponent(GridBagLayout.java:700)
	at java.awt.Container.addImpl(Container.java:1120)
	at java.awt.Container.add(Container.java:966)
	at Questions.initComponents(Questions.java:246)
	at Questions.<init>(Questions.java:50)
	at Choice.btnmathActionPerformed(Choice.java:233)
	at Choice.access$100(Choice.java:24)
	at Choice$2.actionPerformed(Choice.java:72)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
	at java.awt.Component.processMouseEvent(Component.java:6505)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
	at java.awt.Component.processEvent(Component.java:6270)
	at java.awt.Container.processEvent(Container.java:2229)
	at java.awt.Component.dispatchEventImpl(Component.java:4861)
	at java.awt.Container.dispatchEventImpl(Container.java:2287)
	at java.awt.Component.dispatchEvent(Component.java:4687)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
	at java.awt.Container.dispatchEventImpl(Container.java:2273)
	at java.awt.Window.dispatchEventImpl(Window.java:2719)
	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)</init>

推荐答案

100（Choice.java： 24 ）
在Choice

100(Choice.java:24) at Choice

2.actionPerformed（Choice.java： 72 ）
at javax.swing.AbstractButton.fireActionPerformed（AbstractButton.java： 2018 ）
at javax .swing.AbstractButton

2.actionPerformed(Choice.java:72) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018) at javax.swing.AbstractButton

Handler.actionPerformed（AbstractButton.java： 2341 ）
at javax.swing.DefaultButtonModel。 fireActionPerformed（DefaultButtonModel.java： 402 ）
at javax.swing.DefaultButtonModel.setPressed（DefaultButtonModel.java： 259 ）
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased（BasicButtonListener.java： 252 ）
at java.awt .Component.processMouseEvent（Component.java： 6505 ）
at javax.swing.JComponent.processMouseEvent（JComponent.java： 3320 ）
at java.awt.Component.processEvent（Component.java： 6270 ）
at java.awt。 Container.processEvent（Container.java： 2229 ）
at java.awt.Component.dispatchEventImpl（Component.java： 4861 ）
at java.awt.Container.dispatchEventImpl（Container.java： 2287 ）
at java.awt.Component.dispatchEvent（Component.java： 4687 ）
at java.awt.LightweightDispatcher.retargetMouseEvent（Container.java： 4832 ）
在java.awt.LightweightDispatcher.processMouseEvent（Container.java： 4492 ）
at java.awt.LightweightDispatcher.dispatchEvent（Container.java： 4422 ）
at java.awt.Container.dispatchEventImpl（Container.java： 2273 ）
at java.awt.Window.dispatchEventImpl（Window.java： 2719 ）
at java.awt.Component.dispatchEvent（Component.java： 4687 ）
at java.awt.EventQueue.dispatchEventImpl（EventQu eue.java: 735 ）
at java.awt.EventQueue.access

Handler.actionPerformed(AbstractButton.java:2341) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.Component.processMouseEvent(Component.java:6505) at javax.swing.JComponent.processMouseEvent(JComponent.java:3320) at java.awt.Component.processEvent(Component.java:6270) at java.awt.Container.processEvent(Container.java:2229) at java.awt.Component.dispatchEventImpl(Component.java:4861) at java.awt.Container.dispatchEventImpl(Container.java:2287) at java.awt.Component.dispatchEvent(Component.java:4687) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422) at java.awt.Container.dispatchEventImpl(Container.java:2273) at java.awt.Window.dispatchEventImpl(Window.java:2719) at java.awt.Component.dispatchEvent(Component.java:4687) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735) at java.awt.EventQueue.access

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