hi friend,

We have convert your code into GUI.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JOptionPane;
public class CompString implements ActionListener{

JFrame frame;
JPanel panel;
JTextField string1;
JLabel label1, label2;
JButton compareButton;
JTextField string2;
public CompString() {
frame = new JFrame("Compare String");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(new Dimension(180, 80));
panel = new JPanel(new GridLayout(3, 2));
panel.setBorder(BorderFactory.createEmptyBorder(60, 60, 20, 60));
addItems();
frame.getRootPane().setDefaultButton(compareButton);
frame.getContentPane().add(panel, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
}
private void addItems() {
label1 = new JLabel("Text1", SwingConstants.LEFT);
string1 = new JTextField(20);

compareButton = new JButton("Compare");
label2 = new JLabel("Text2", SwingConstants.LEFT);
string2 = new JTextField(20);

compareButton.addActionListener(this);
panel=new JPanel(new GridLayout(4,1));
panel.add(label1);
panel.add(string1);
panel.add(label2);
panel.add(string2);
panel.add(compareButton);

label1.setBorder(BorderFactory.createEmptyBorder(5, 10, 5, 5));
label1.setBorder(BorderFactory.createEmptyBorder(5, 10, 5, 5));
}
public void actionPerformed(ActionEvent event) {
String st1=string1.getText();
String st2=string2.getText();
if (st2.compareTo(st1) > 0){
JOptionPane.showMessageDialog(null,"The second string is greater than the first one");
}
else{
JOptionPane.showMessageDialog(null,"The first string is greater than the second one");
}
}
private static void createAndShowGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
CompString converter = new CompString();
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}

Thanks