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Thread: JFileChooser

  1. #1
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    Default JFileChooser

    import java.awt.BorderLayout;
    import java.awt.Container;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.io.File;
     
    import javax.swing.*;
     
     
    public class Notepad extends JFrame{
     
    	/**
    	 * @param args
    	 */
    	Notepad()
    	{
    		final JFrame f = new JFrame();
    		Container cp = f.getContentPane();
     
    		final JLabel dl = new JLabel("");
    		cp.add(dl,BorderLayout.NORTH);
     
    		final JLabel fl = new JLabel("");
    		cp.add(fl,BorderLayout.SOUTH);
     
    		JFileChooser fc =new JFileChooser(".");
    		fc.setControlButtonsAreShown(false);
    		cp.add(fc,BorderLayout.CENTER);
     
    		//The MenuBar
    		JMenuBar mb = new JMenuBar();
    		setJMenuBar(mb);
     
    		//The Menu
    		JMenu m1  = new JMenu("File");
    		JMenu m2 = new JMenu("Edit");
    		JMenu m3 = new JMenu("View");
     
    		//The Menu Items
    		JMenuItem i1 = new JMenuItem("New");
    		JMenuItem i2  = new JMenuItem("Open");
    		JMenuItem i3 = new JMenuItem("Close");
     
    		mb.add(m1);
    		mb.add(m2);
    		mb.add(m3);
     
    		m1.add(i1);
    		m1.add(i2);
    		m1.add(i3);
     
    		//The TextArea
    		final JTextArea ta = new JTextArea();
    		add(ta);
     
    		//The New ActionListener
    		i1.addActionListener(new ActionListener(){
    			public void actionPerformed(ActionEvent e)
    			{
    				ta.setText(" ");
    			}
    		});
     
    		//The Open ActionListener
    		i2.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent ae)
    			{
     
     
    				JFileChooser tfc = (JFileChooser) ae.getSource();
    				String command = ae.getActionCommand();
    				if(command.equals(JFileChooser.APPROVE_SELECTION))
    				{
    					File sf = tfc.getSelectedFile();
    					dl.setText(sf.getParent());
    					fl.setText(sf.getName());
    				}
    				else if(command.equals(JFileChooser.CANCEL_SELECTION))
    				{
    					dl.setText(" ");
    					fl.setText(" ");
    				}
    				f.pack();
    				f.setVisible(true);
    			}
    		});
     
    	}
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		Notepad m = new Notepad();
    		m.setSize(500,500);
    		m.setVisible(true);
     
    	}
     
    }

    The JFileChooser is not opening when the 'open' is clicked.Instead,it is throwing a series of exceptions.


  2. #2
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    Default Re: JFileChooser

    What exceptions?
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  3. #3
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    Default Re: JFileChooser

    Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.JMenuItem cannot be cast to javax.swing.JFileChooser
    at Notepad$2.actionPerformed(Notepad.java:70)
    at javax.swing.AbstractButton.fireActionPerformed(Unk nown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed (Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed (Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.AbstractButton.doClick(Unknown Source)
    at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unk nown Source)
    at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mou seReleased(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(U nknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unkno wn 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$000(Unknown Source)
    at java.awt.EventQueue$1.run(Unknown Source)
    at java.awt.EventQueue$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectio nPrivilege(Unknown Source)
    at java.security.AccessControlContext$1.doIntersectio nPrivilege(Unknown Source)
    at java.awt.EventQueue$2.run(Unknown Source)
    at java.awt.EventQueue$2.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectio nPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilter s(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(U nknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

  4. #4

    Default Re: JFileChooser

    Hi, you are wrong when doing this:

    JFileChooser tfc = (JFileChooser) ae.getSource();

    Because the object that generates the event is the menu item, thus this exception:

    java.lang.ClassCastException: javax.swing.JMenuItem cannot be cast to javax.swing.JFileChooser

    There are some useful examples about JFilechooser here and there.

  5. The Following User Says Thank You to nambill For This Useful Post:

    Karthik Prabhu (June 23rd, 2012)

  6. #5
    Junior Member
    Join Date
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    Default Re: JFileChooser

    Thank u very much....It has worked.

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