ADVANCED GUIS AND GRAPHICS - Java Programming: From Problem Analysis to Program Design - page 815

public class WhiteBoard extends JFrame
implements ActionListener

{

private static int WIDTH = 550;
private static int HEIGHT = 350;

private int row = 10;
private int col = 20;

//GUI components
private JLabel headingL;
private JTextField lineTF;
private JTextArea whiteBoardTA;
private JButton exitB, appendB;

public WhiteBoard()
{

setTitle("White Board");
Container pane = getContentPane();
setSize(WIDTH,HEIGHT);

headingL = new JLabel("Welcome to White Board");
lineTF = new JTextField(20);

whiteBoardTA = new JTextArea(row, col);
exitB = new JButton("Exit");
exitB.addActionListener( this );

appendB = new JButton("Append");
appendB.addActionListener( this );

pane.setLayout( null );

headingL.setLocation(50, 20);
lineTF.setLocation(20, 100);
whiteBoardTA.setLocation(320, 50);
appendB.setLocation(230, 100);
exitB.setLocation(230, 250);

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headingL.setSize(200, 30);
lineTF.setSize(200, 30);
whiteBoardTA.setSize(200, 200);
appendB.setSize(80, 30);
exitB.setSize(80, 30);

pane.add(headingL);
pane.add(lineTF);
pane.add(whiteBoardTA);
pane.add(appendB);
pane.add(exitB);