[Java ] JTextField, Grid Layout

GUIDEMO.Java

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package thanhcs.blogspot.com;

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;

public class GUIDEMO extends JFrame implements ActionListener{


    JLabel mjLabel, mjLabel1, mjLabel2;
    JTextField mJtext, mJtext1, mJtext2;
    public GUIDEMO() {

        setLayout(new GridLayout(3, 3, 5, 5));
        add(mjLabel = new JLabel("Enter numerator", SwingConstants.RIGHT)); 
        add(mJtext = new JTextField());
        
        add(mjLabel1 = new JLabel("Enter denominator and press enter",SwingConstants.RIGHT)); 
        add(mJtext1 = new JTextField());
        
        add(mjLabel2 = new JLabel("RESULT",SwingConstants.RIGHT)); 
        add(mJtext2 = new JTextField());

        mJtext1.addActionListener(this);


        setVisible(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(420, 150);
        setLocationRelativeTo(null);
    }
    @Override
    public void actionPerformed(ActionEvent arg0) {
        int temp1 = 0 ;
        int temp2 = 0 ;
        try {
             temp1 = Integer.parseInt(mJtext.getText());
             temp2 = Integer.parseInt(mJtext1.getText());
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null, "Number only. Please ! :)");
        }
        
        mJtext2.setText(""+(temp1+temp2));
    }

}

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test.java

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package thanhcs.blogspot.com;

public class test {

    public static void main(String[] args) {
        GUIDEMO a = new GUIDEMO();
    }
}

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