GRAPHICAL USER INTERFACE (GUI) AND OBJECT-ORIENTED DESIGN (OOD) - Java Programming: From Problem Analysis to Program Design - page 353

widthL = new JLabel("Enter the width: ",
SwingConstants.RIGHT);
areaL = new JLabel("Area: ", SwingConstants.RIGHT);
perimeterL = new JLabel("Perimeter: ",
SwingConstants.RIGHT);

//Create the four text fields
lengthTF = new JTextField(10);
widthTF = new JTextField(10);
areaTF = new JTextField(10);
perimeterTF = new JTextField(10);

//Create Calculate Button
calculateB = new JButton("Calculate");
cbHandler = new CalculateButtonHandler();
calculateB.addActionListener(cbHandler);

//Create Exit Button
exitB = new JButton("Exit");
ebHandler = new ExitButtonHandler();
exitB.addActionListener(ebHandler);

6

//Set the title of the window
setTitle("Area and Perimeter of a Rectangle");

//Get the container
Container pane = getContentPane();

//Set the layout
pane.setLayout( new GridLayout(5, 2));

//Place the components in the pane
pane.add(lengthL);
pane.add(lengthTF);
pane.add(widthL);
pane.add(widthTF);
pane.add(areaL);
pane.add(areaTF);
pane.add(perimeterL);
pane.add(perimeterTF);
pane.add(calculateB);
pane.add(exitB);

//Set the size of the window and display it
setSize(WIDTH, HEIGHT);
setVisible( true );
setDefaultCloseOperation(EXIT_ON_CLOSE);

}