01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
package horstmann.ch04_action1;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
public class ActionTester
{
public static void main(String[] args)
{
JFrame frame = new JFrame();
final int FIELD_WIDTH = 20;
final JTextField textField = new JTextField(FIELD_WIDTH);
textField.setText("Click a button!");
JButton helloButton = new JButton("Say Hello");
helloButton.addActionListener(event -> textField.setText("Hello, World!"));
JButton goodbyeButton = new JButton("Say Goodbye");
goodbyeButton.addActionListener(event -> textField.setText("Goodbye, World!"));
frame.setLayout(new FlowLayout());
frame.add(helloButton);
frame.add(goodbyeButton);
frame.add(textField);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
}
|
