Re: Creating a simple visual user interface

Danger_Duck wrote:


Simple GUIs are very easy to do. Just create a frame, add your
components and the code to populate and depopulate the fields. Learn
how to use GridBagLayout. You can make very simple GUI programs that
way. I don't use an IDE, I just use vim for an editor. I'll even write
you a simple sample.

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

public class SimpleGUI extends JFrame implements ActionListener {
     JTextField tf;

     public SimpleGUI() {
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

         setLayout(new GridBagLayout());
         GridBagConstraints c = new GridBagConstraints();

         c.gridy = 0; c.gridwidth = 2;
         tf = new JTextField(20);
         add(tf,c);

         ++c.gridy; c.gridwidth = 1; c.weightx = 1.0;
         c.anchor = GridBagConstraints.EAST;
         JButton getButton = new JButton("Get Data");
         getButton.addActionListener(this);
         add(getButton,c);

         c.anchor = GridBagConstraints.WEST;
         JButton processButton = new JButton("Process Data");
         processButton.addActionListener(this);
         add(processButton,c);

         // make the buttons the same size
         Dimension d = processButton.getPreferredSize();
         getButton.setPreferredSize(d);

         pack();
         setVisible(true);
     }

     public void actionPerformed(ActionEvent ae) {
         String ac = ae.getActionCommand();

         if (ac.equals("Get Data")) {
             // get the data from somewhere
             // put it in the JTextField
             tf.setText("New Data");
         } else if (ac.equals("Process Data")) {
             // process data
             String str = tf.getText().toUpperCase();
             // put result in JTextField
             tf.setText(str);
         }
     }

     public static void main(String[] args) {
         // Swing components must be created and accessed on the EDT
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 new SimpleGUI();
             }
         });
     }
}

--

Knute Johnson
email s/nospam/knute2008/

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