Re: Why doesn't my JTable display

From:

"Daniel Pitts" <googlegroupie@coloraura.com>

Newsgroups:

comp.lang.java.programmer

Date:

5 Jan 2007 22:35:18 -0800

Message-ID:

<1168065317.948120.260920@v33g2000cwv.googlegroups.com>

wooks wrote:

I would appreciate some urgent assistance with this simple code.

When it run it displays a blank frame. What do I need to do to get the
JTable to display?

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;

public class RunFileMatcher extends JFrame {

   RunFileMatcher() {
      JFrame frame = new JFrame("MatchTable");
      frame.setSize(600,400);

      String[] columnNames = {"File", "Size"};
      String dataValues[][] = {
         { "A", "234" },
         { "B", "43" },
         { "C", "89.2" },
         { "D", "9033" }
      };

      JTable table = new JTable(dataValues,columnNames);
      getContentPane().add(new JScrollPane(table), "Center");

      frame.setVisible( true );
      frame.setDefaultCloseOperation( WindowConstants.EXIT_ON_CLOSE );

   }
}

Ah, heres the problem....
Your class RunFileMatcher extends JFrame, and therefor IS-A JFrame, you
also create a *different* JFrame object (JFrame frame = new JFrame()).
You set up the table and the frame, but you add the table to your
RunFileMatcher object instead of the JFrame you initialized.

change the line:
public class RunFileMatcher extends JFrame {
to
public class RunFileMatcher {

and the line
getContentPane().add(new JScrollPane(table), "Center");
to
frame.getContentPane().add(new JScrollPane(table),
BorderLayer.CENTER);