[Eranga]

Here is much better code segment. Write it just for fun. Try to learn something on that pal, but I'm not superior on Java.

import javax.swing.JOptionPane;

public class study2 {

    public static void main(String[] args) {
        String temp1 = null , temp2 = null;
        int num1 = 0 , num2 = 0, max = 0;
        int ret = 0;
        
        inner: do {
            try {
                temp1 = JOptionPane.showInputDialog("The First Number is:");
                num1 = Integer.parseInt(temp1);

                temp2 = JOptionPane.showInputDialog("The Second Number is:");
                num2 = Integer.parseInt(temp2);
            }
            catch(NumberFormatException ex) {
                JOptionPane.showMessageDialog(null, "Invalid input");
                continue inner;
            }
            if (num1 > num2)
                max = num1;
            else 
                max = num2;

            JOptionPane.showMessageDialog(null,"The Maximum is " +max);
            ret = JOptionPane.showConfirmDialog(null, "Continue?", "More", 
                    JOptionPane.YES_NO_OPTION , JOptionPane.INFORMATION_MESSAGE);

        } while(ret == JOptionPane.YES_OPTION);
    }

}