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| 14. 5. 1. 创建JButton |
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public JButton()
JButton button = new JButton();
public JButton(Icon image)
Icon icon = new ImageIcon("dog.jpg");
JButton button = new JButton(icon);
public JButton(String text)
JButton button = new JButton("Dog");
public JButton(String text, Icon icon)
Icon icon = new ImageIcon("dog.jpg");
JButton button = new JButton("Dog", icon);
public JButton(Action action)
Action action = ...;
JButton button = new JButton(action);
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import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class MainClass{
public static void main(String[] a){
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new ButtonDemo());
f.setSize(500,500);
f.setVisible(true);
}
}
class ButtonDemo extends JPanel implements ActionListener {
JTextField jtf;
public ButtonDemo() {
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
makeGUI();
}
});
} catch (Exception exc) {
System.out.println("Can't create because of " + exc);
}
}
private void makeGUI() {
setLayout(new FlowLayout());
ImageIcon france = new ImageIcon("france.gif");
JButton jb = new JButton(france);
jb.setActionCommand("France");
jb.addActionListener(this);
add(jb);
ImageIcon germany = new ImageIcon("germany.gif");
jb = new JButton(germany);
jb.setActionCommand("Germany");
jb.addActionListener(this);
add(jb);
ImageIcon italy = new ImageIcon("italy.gif");
jb = new JButton(italy);
jb.setActionCommand("Italy");
jb.addActionListener(this);
add(jb);
ImageIcon japan = new ImageIcon("japan.gif");
jb = new JButton(japan);
jb.setActionCommand("Japan");
jb.addActionListener(this);
add(jb);
jtf = new JTextField(15);
add(jtf);
}
public void actionPerformed(ActionEvent ae) {
jtf.setText(ae.getActionCommand());
}
}
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