Returns the type of file problem of method
I have a method that looks like this:Public folder OpenFile()
{
final JFileChooser CF = new JFileChooser();
int iReturnVal = fc.showOpenDialog (this);
File = null;
If (iReturnVal is CF. APPROVE_OPTION)
{
file = fc.getSelectedFile ();
return the file;
}
return the file;
}
As you can see, this method allows the user to open a file picker and select a file to open, the file variable is returned. It works fine when a user selects a file, but when the user presses Cancel, which means that the value of the file will be "null". The following error is returned:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
to the teleprompter. Hand$ 1.actionPerformed (hand. Java:99)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
in 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.AbstractButton.doClick(AbstractButton.java:376)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833)
in javax.swing.plaf.basic.BasicMenuItemUI$ Handler.mouseReleased (BasicMenuItemUI.java:877)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
at java.awt.Component.processMouseEvent(Component.java:6504)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6269)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4860)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4686)
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:2713)
at java.awt.Component.dispatchEvent(Component.java:4686)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
to java.awt.EventQueue.access$ 000 (EventQueue.java:101)
in java.awt.EventQueue$ 3.run(EventQueue.java:666)
in java.awt.EventQueue$ 3.run(EventQueue.java:664)
at java.security.AccessController.doPrivileged (Native Method)
in java.security.ProtectionDomain$ 1.doIntersectionPrivilege(ProtectionDomain.java:76)
in java.security.ProtectionDomain$ 1.doIntersectionPrivilege(ProtectionDomain.java:87)
in java.awt.EventQueue$ 4.run(EventQueue.java:680)
in java.awt.EventQueue$ 4.run(EventQueue.java:678)
at java.security.AccessController.doPrivileged (Native Method)
in java.security.ProtectionDomain$ 1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Should I be 'file' as something else than null initialization to avoid this error? How can I fix? I can post the source for the entire program if you want, let me know.
if (file != null)
Tags: Java
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