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Progress Bar Demo
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author MBC
*/
public class ProgressBarDemo extends JApplet
{
private JProgressBar jpb = new JProgressBar();
private JTextArea jtaResult = new JTextArea();
private JTextField jtfPrimeCount = new JTextField(8);
private JButton jbtDisplayPrime = new JButton("Display Prime");
public ProgressBarDemo()
{
jpb.setStringPainted(true);
jpb.setValue(0);
jpb.setMaximum(100);
jtaResult.setWrapStyleWord(true);
jtaResult.setLineWrap(true);
JPanel panel = new JPanel();
panel.add(new JLabel("Enter the prime number count."));
panel.add(jtfPrimeCount);
panel.add(jbtDisplayPrime);
add(jpb, BorderLayout.NORTH);
add(new JScrollPane(jtaResult), BorderLayout.CENTER);
add(panel, BorderLayout.SOUTH);
jbtDisplayPrime.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
ComputePrime task = new ComputePrime(
Integer.parseInt(jtfPrimeCount.getText()), jtaResult);
task.addPropertyChangeListener( new PropertyChangeListener()
{
public void propertyChange(PropertyChangeEvent e)
{
if ("progress".equals(e.getPropertyName()))
{
jpb.setValue((Integer)e.getNewValue());
}
}
});
task.execute();
}
});
}
static class ComputePrime extends SwingWorker
{
private int count;
private JTextArea result;
public ComputePrime(int count, JTextArea result)
{
this.count = count;
this.result = result;
}
protected Integer doInBackground()
{
publishPrimeNumbers(count);
return 0;
}
protected void process(java.util.List list)
{
for (int i = 0; i < list.size(); i++)
result.append(list.get(i) + " ");
}
protected void publishPrimeNumbers(int n)
{
int count = 0;
int number = 2;
while (count <= n)
{
if (isPrime(number))
{
count++;
setProgress(100 * count / n);
publish(number);
}
number++;
}
}
private static boolean isPrime(int number)
{
for (int divisor = 2; divisor <= number / 2; divisor ++)
{
if(number % divisor == 0)
{
return false;
}
}
return true;
}
}
}
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