Mega Code Archive
Use SwingWorker to wrap time consuming task
<![CDATA[
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.math.BigInteger;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingWorker;
public class PrimeCheck extends JFrame {
public PrimeCheck() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
JPanel pnl = new JPanel();
JButton btnCheck = new JButton("Check");
ActionListener al;
al = new ActionListener() {
public void actionPerformed(ActionEvent ae) {
try {
BigInteger bi = new BigInteger("1234567");
System.out.println("One moment...");
new PrimeCheckTask(bi).execute();
} catch (NumberFormatException nfe) {
System.out.println("Invalid input");
}
}
};
btnCheck.addActionListener(al);
pnl.add(btnCheck);
getContentPane().add(pnl, BorderLayout.NORTH);
pack();
setResizable(false);
setVisible(true);
}
public static void main(String[] args) {
new PrimeCheck();
}
}
class PrimeCheckTask extends SwingWorker<Boolean, Void> {
private BigInteger bi;
PrimeCheckTask(BigInteger bi) {
this.bi = bi;
}
@Override
public Boolean doInBackground() {
return bi.isProbablePrime(1000);
}
@Override
public void done() {
try {
boolean isPrime = get();
if (isPrime)
System.out.println("Integer is prime");
else
System.out.println("Integer is not prime");
} catch (Exception ee) {
System.out.println("Unable to determine primeness");
}
}
}
]]>