Program to read data using InputDialog and display data using MessageDialog in Java

// Program to read data using InputDialog and display data using MessageDialog.
import javax.swing.JOptionPane;
class  Swap4
{
public static void main( String args[ ] )
{
 int  a=0, b=0, t;
 a = Integer.parseInt(JOptionPane.showInputDialog("Enter first Number : " ));
 b = Integer.parseInt(JOptionPane.showInputDialog("Enter second Number : " ));

 JOptionPane.showMessageDialog( null, " Before Swapping : " + a + "   " + b );
 
 a = a + b;
 b = a - b;
 a = a - b;
 
 JOptionPane.showMessageDialog( null, " After Swapping : " + a + "   " + b );
}
}

Output:
See output runtime with diaog