import javax.swing.*;

import java.awt.Dimension;

import java.awt.GridLayout;

import java.awt.event.*;

// Text fields help get input from the user

public class BasicJFrameTextFields implements ActionListener{

JFrame frame;

JPanel myPanel;

JLabel label1, label2, label3, averageLabel;

JTextField text1, text2, text3;

JButton button;

public BasicJFrameTextFields () {

frame = new JFrame ("Basic JFrame with TextField Example");

frame.setPreferredSize(new Dimension(800, 400));

frame.setLocation(200, 200);

myPanel = new JPanel ();

myPanel.setLayout (new GridLayout (0,2,10,5));

myPanel.setBorder (BorderFactory.createEmptyBorder (50,50,50,50));

label1 = new JLabel ("Enter the first mark: ");

label1.setBorder(BorderFactory.createEmptyBorder (10,0,50,10));

label2 = new JLabel ("Enter the second mark: ");

label3 = new JLabel ("Enter the third mark: ");

averageLabel = new JLabel ("");

averageLabel.setBorder (BorderFactory.createEmptyBorder(10, 200, 10, 10));

text1 = new JTextField ();

text2 = new JTextField ();

text3 = new JTextField ();

button = new JButton ("Average");

button.setActionCommand ("Average");

button.addActionListener (this);

myPanel.add (label1);

myPanel.add (text1);

myPanel.add(Box.createRigidArea(new Dimension(20,0))); // adding space in between

myPanel.add(Box.createRigidArea(new Dimension(20,0)));

myPanel.add (label2);

myPanel.add (text2);

myPanel.add (label3);

myPanel.add (text3);

myPanel.add (button);

myPanel.add (averageLabel);

frame.add (myPanel);

frame.pack ();

frame.setVisible (true);

}

public void actionPerformed (ActionEvent event) {

String eventName = event.getActionCommand();

if (eventName.equals ("Average")) {

double ave;

String m1 = text1.getText ();

String m2 = text2.getText ();

String m3 = text3.getText ();

ave = Double.parseDouble(m1) + Double.parseDouble (m2) + Double.parseDouble(m3);

ave /= 3;

averageLabel.setText (Double.toString (ave));

}

}

public static void main (String [] args){

new BasicJFrameTextFields ();

}

}