FlowLayout

• FlowLayout ref
• How to Use FlowLayout

Textbook example

// FlowLayoutDemo.java
// Demonstrating FlowLayout alignments.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class FlowLayoutDemo extends JFrame {
   private JButton left, center, right;
   private Container c;
   private FlowLayout layout;
   
   public FlowLayoutDemo()
   {
      super( "FlowLayout Demo" );

      layout = new FlowLayout();

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

      left = new JButton( "Left" );
      left.addActionListener(
         new ActionListener() {
            public void actionPerformed( ActionEvent e )
            {
               layout.setAlignment( FlowLayout.LEFT );

               // re-align attached components
               layout.layoutContainer( c );
            }
         }
      );
      c.add( left );

      center = new JButton( "Center" );
      center.addActionListener(
         new ActionListener() {
            public void actionPerformed( ActionEvent e )
            {
               layout.setAlignment( FlowLayout.CENTER );

               // re-align attached components
               layout.layoutContainer( c );  
            }
         }
      );
      c.add( center );

      right = new JButton( "Right" );
      right.addActionListener(
         new ActionListener() {
            public void actionPerformed( ActionEvent e )
            {
               layout.setAlignment( FlowLayout.RIGHT );

               // re-align attached components
               layout.layoutContainer( c );  
            }
         }
      );
      c.add( right );

      setSize( 300, 75 );
      show();
   }

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

      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 FlowWindow extends JFrame {
    boolean inAnApplet = true;
     
    public FlowWindow() {
        Container contentPane = getContentPane();
        contentPane.setLayout(new FlowLayout());
   
        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[]) {
        FlowWindow window = new FlowWindow();
        window.inAnApplet = false;

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

Maintained by John Loomis, last updated 15 June 2000