␡
- Introduction to Interface Builder
- Java Code Example
- Objective-C Code Example
- Conclusion
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Java Code Example
To emphasize the differences between building a GUI in JFC/Swing and Interface Builder, I will walk through a simple code example for both. In this example, I will produce an application with a single window, a single button, and a single label. When the button is pressed, the label will change its text to the infamous "Hello World".
package com.zarrastudios.example;
import javax.swing.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.*;
public class HelloFrame extends JFrame {
private JButton btnAction;
private JLabel lblDisplay;
public HelloFrame() {
super("Hello Frame");
initComponents();
initLayout();
initListeners();
pack();
}
private void initComponents() {
btnAction = new JButton("Action!");
lblDisplay = new JLabel("---------");
}
private void initLayout() {
JPanel p = new JPanel(new BorderLayout());
p.add(btnAction, BorderLayout.SOUTH);
p.add(lblDisplay, BorderLayout.NORTH);
setContentPane(p);
}
private void initListeners() {
btnAction.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
lblDisplay.setText("Hello World!");
}
});
}
public static void main(String args[]) {
HelloFrame hf = new HelloFrame();
hf.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
System.exit(0);
}
});
hf.setVisible(true);
}
}
This is a fairly simple GUI. I have broken the initialization of the GUI components away from the layout code and the listener code. Although not strictly needed in this example, it helps for future maintainability.