?? paneldemo.java
字號:
// Clicking on the button
// causes a line to be drawn in the panel.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class PanelDemo extends JFrame implements ActionListener {
private JButton button;
private JPanel panel;
public static void main(String[] args) {
PanelDemo frame = new PanelDemo();
frame.setSize(400,300);
frame.createGUI();
frame.show();
}
private void createGUI() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
Container window = getContentPane();
window.setLayout(new FlowLayout());
panel = new JPanel();
panel.setPreferredSize(new Dimension(100, 100));
panel.setBackground(Color.white);
window.add(panel);
button = new JButton("Press me");
window.add(button);
button.addActionListener(this);
}
public void actionPerformed(ActionEvent event) {
Graphics paper = panel.getGraphics();
paper.drawLine(0,0,111,113);
}
}
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