000
25.05.2004, 15:44 Uhr
kaihua
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Hier are zwei Java Progrmme :
1.Programm
| Code: |
package counter;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
class CounterPanel extends Canvas implements ActionListener, MouseListener
{
private Timer timer;
private int number = 0;
CounterPanel()
{
addMouseListener(this);
// Timer(int delay, ActionListener a), delay in ms
timer = new Timer(500, this);
timer.setInitialDelay(0);
timer.start();
}
public void mousePressed(MouseEvent me)
{
if (timer.isRunning())
timer.stop();
else
timer.start();
}
public void mouseClicked(MouseEvent me){}
public void mouseReleased(MouseEvent me){}
public void mouseEntered(MouseEvent me){}
public void mouseExited(MouseEvent me){}
public void paint(Graphics g)
{
g.drawString("Counter: " + number + "S", 20, 40);
}
public void actionPerformed(ActionEvent e)
{
number++;
repaint();
}
}
class CreateAndShowGUI extends JFrame
{
public CreateAndShowGUI()
{
//Make sure we have nice window decorations.
setDefaultLookAndFeelDecorated(true);
//Create and set up the window
setTitle("Counter");
setSize(300,200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container contentPane = getContentPane();
contentPane.add(new CounterPanel());
// setVisible(true);
}
}
public class Counter
{
public static void main(String [] args)
{
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
new CreateAndShowGUI().show();
}
});
}
}
|
2.Programm
| Code: |
package counter;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
// Im Vergleich zum ersten Programm ist hier extends JPanel anstaat
// extends Canvas, das Ergebnis ist dann anders: man kann
// das number nicht genau sehen, weil es überlappt.
// Jetzt die Frage ist, wenn ich unbedingt extends JPanel will,
// was soll ich machen, damit die number auch klar sehbar?
class CounterPanel extends JPanel implements ActionListener, MouseListener
{
private Timer timer;
private int number = 0;
CounterPanel()
{
addMouseListener(this);
// Timer(int delay, ActionListener a), delay in ms
timer = new Timer(500, this);
timer.setInitialDelay(0);
timer.start();
}
public void mousePressed(MouseEvent me)
{
if (timer.isRunning())
timer.stop();
else
timer.start();
}
public void mouseClicked(MouseEvent me){}
public void mouseReleased(MouseEvent me){}
public void mouseEntered(MouseEvent me){}
public void mouseExited(MouseEvent me){}
public void paint(Graphics g)
{
g.drawString("Counter: " + number + "S", 20, 40);
}
public void actionPerformed(ActionEvent e)
{
number++;
repaint();
}
}
class CreateAndShowGUI extends JFrame
{
public CreateAndShowGUI()
{
//Make sure we have nice window decorations.
setDefaultLookAndFeelDecorated(true);
//Create and set up the window
setTitle("Counter");
setSize(300,200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container contentPane = getContentPane();
contentPane.add(new CounterPanel());
// setVisible(true);
}
}
public class Counter
{
public static void main(String [] args)
{
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
new CreateAndShowGUI().show();
}
});
}
}
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