GridLayout

• GridLayout ref
• How to Use GridLayout

Textbook example

// GridLayoutDemo.java
// Demonstrating GridLayout.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class GridLayoutDemo extends JFrame
                            implements ActionListener {
   private JButton b[];
   private String names[] =
      { "one", "two", "three", "four", "five", "six" };
   private boolean toggle = true;
   private Container c;
   private GridLayout grid1, grid2;

   public GridLayoutDemo()
   {
      super( "GridLayout Demo" );

      grid1 = new GridLayout( 2, 3, 5, 5 );
      grid2 = new GridLayout( 3, 2 );

      c = getContentPane();
      c.setLayout( grid1 );

      // create and add buttons
      b = new JButton[ names.length ];

      for (int i = 0; i < names.length; i++ ) {
         b[ i ] = new JButton( names[ i ] );
         b[ i ].addActionListener( this );
         c.add( b[ i ] );
      }

      setSize( 300, 150 );
      show();
   }

   public void actionPerformed( ActionEvent e )
   { 
      if ( toggle )
         c.setLayout( grid2 );
      else
         c.setLayout( grid1 );

      toggle = !toggle;
      c.validate();
   }

   public static void main( String args[] )
   {
      GridLayoutDemo app = new GridLayoutDemo();

      app.addWindowListener(
         new WindowAdapter() {
            public void windowClosing( WindowEvent e )
            {
               System.exit( 0 );
            }
         }
      );
   } 
}

Tutorial example

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

public class GridWindow extends JFrame {
    boolean inAnApplet = true;

    public GridWindow() {
        Container contentPane = getContentPane();

        contentPane.setLayout(new GridLayout(0,2));
   
        contentPane.add(new JButton("Button 1"));
        contentPane.add(new JButton("2"));
        contentPane.add(new JButton("Button 3"));
        contentPane.add(new JButton("Long-Named Button 4"));
        contentPane.add(new JButton("Button 5"));

        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                if (inAnApplet) {
                    dispose();
                } else {
                    System.exit(0);
                }
            }
        });
    }

    public static void main(String args[]) {
        GridWindow window = new GridWindow();
        window.inAnApplet = false;

        window.setTitle("GridLayout");
        window.pack();
        window.setVisible(true);
    }
}

Maintained by John Loomis, last updated 15 June 2000