JDot
package puntini;
import java.awt.Color;
import javax.swing.JLabel;
public class JDot extends JLabel implements Runnable {
private String s = "Attendere";
private boolean running = false;
public JDot() {
this.setText(s);
this.setOpaque(true);
this.setBackground(Color.YELLOW);
}
public void start() {
if (!running) {
running = true;
Thread t = new Thread(this);
t.setDaemon(true);
t.start();
}
}
public void stop() {
running = false;
}
@Override
public void run() {
while (running) {
s += '.';
this.setText(s);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
}
}
}
Main
package puntini;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.SpringLayout;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class Main extends JFrame {
private JDot jDot;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Main frame = new Main();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Main() {
setTitle("Puntini");
setBounds(100, 100, 450, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
SpringLayout springLayout = new SpringLayout();
getContentPane().setLayout(springLayout);
jDot = new JDot();
springLayout.putConstraint(SpringLayout.NORTH, jDot, 10, SpringLayout.NORTH, getContentPane());
springLayout.putConstraint(SpringLayout.WEST, jDot, 10, SpringLayout.WEST, getContentPane());
getContentPane().add(jDot);
JButton btnAvvia = new JButton("Avvia");
btnAvvia.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
jDot.start();
}
});
springLayout.putConstraint(SpringLayout.NORTH, btnAvvia, 6, SpringLayout.SOUTH, jDot);
springLayout.putConstraint(SpringLayout.WEST, btnAvvia, 0, SpringLayout.WEST, jDot);
getContentPane().add(btnAvvia);
JButton btnFerma = new JButton("Ferma");
btnFerma.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jDot.stop();
}
});
springLayout.putConstraint(SpringLayout.NORTH, btnFerma, 0, SpringLayout.NORTH, btnAvvia);
springLayout.putConstraint(SpringLayout.WEST, btnFerma, 6, SpringLayout.EAST, btnAvvia);
getContentPane().add(btnFerma);
}
}
