showOpenDialog Question

From: J.Storta (john.storta_at_jstorta.com)
Date: 11/27/04

  • Next message: Andrew Thompson: "Re: showOpenDialog Question" 
    Date: 27 Nov 2004 05:58:08 -0800

    I am new to Java.

    I have been working through some tutorials and I am trying to make
    modifications to test my understanding of some of the concepts. I am
    having trouble with something.

    Below is a piece of code for an application. For the purpose of
    brevity on this post, I removed some of the code that I didn't think
    was relevent to this question.

    The problem I am having as to do with the showOpenDialog call in the
    buildMenu() method.

    According to the documentation, the method takes a parameter of the
    parent component, but it also accepts null.

    I can get the code to work as expected by passing null, but I am not
    sure why it fails when I pass a parameter of 'this'.

    Ths is the error I get at compile time. 

    ----
showOpenDialog(java.awt.Component) in javax.swing.JFileChooser cannot
be applied to (<anonymous java.awt.event.ActionListener>)
----
Any insight would be appreciated.
Thanks.
Here is the code
------------
package mypackage;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class MyPackage extends JFrame
{
   private JTabbedPane tabbedPane;
   public MyPackage()
   {
      super("My First Package");
      //Create the tabs
      tabbedPane = new JTabbedPane(SwingConstants.TOP);
      tabbedPane.setBackground(Color.yellow);
      tabbedPane.setForeground(Color.black);
      populateTabbedPane();
      buildMenu();
      getContentPane().add(tabbedPane);
      pack();
   }
   private void populateTabbedPane()
   {
	//Tabs
   }
   private void buildMenu()
   {
      JMenuBar mb = new JMenuBar();
      JMenu fileMenu = new JMenu("File");
      JMenuItem fileItem = new JMenuItem("Open");
      fileItem.addActionListener(new ActionListener()
       {
         public void actionPerformed(ActionEvent e)
         {
           JFileChooser fileOpen = new JFileChooser();
           int returnVal = fileOpen.showOpenDialog(null);
           if(returnVal == JFileChooser.APPROVE_OPTION)
           {
             System.out.println("You chose to open this file: " +
fileOpen.getSelectedFile().getName());
           }
         }
       });
      fileMenu.add(fileItem);
      setJMenuBar(mb);
   }
   public static void main(String[] args)
   {
      MyPackage mp = new MyPackage();
      mp.setLocation(175, 50);
      mp.setSize(600, 500);
      mp.setBackground(Color.magenta);
      mp.setVisible(true);
   }
}
  • Next message: Andrew Thompson: "Re: showOpenDialog Question"