// define north panel and components

JPanel northPanel = new JPanel ( ) ;

JButton resetButton = new JButton ( "Reset" ) ;

JButton exitButton = new JButton ( "Exit" ) ;

// define east panel and components

JPanel eastPanel = new JPanel ( ) ;

JCheckBox northCheck = new JCheckBox ( "North" ) ;

JCheckBox southCheck = new JCheckBox ( "South" ) ;

JCheckBox westCheck = new JCheckBox ( "West" ) ;

JCheckBox centerCheck = new JCheckBox ( "Center" ) ;

// define west panel and components

JPanel westPanel = new JPanel ( ) ;

JRadioButton red = new JRadioButton ( "Red", false ) ;

JRadioButton green = new JRadioButton ( "Green", false ) ;

JRadioButton blue = new JRadioButton ( "Blue", false ) ;

JRadioButton black = new JRadioButton ( "Black", true ) ;

ButtonGroup colorGroup = new ButtonGroup ( ) ;

// define center panel and components

JPanel centerPanel  = new JPanel ( ) ;

JButton northButton = new JButton ( "North" ) ;

JButton southButton = new JButton ( "South" ) ;

JButton eastButton = new JButton ( "East" ) ;

JButton westButton = new JButton ( "West" ) ;

JButton centerButton = new JButton ( "Center" ) ;

// define south panel and components

JPanel southPanel = new JPanel ( ) ;

JTextField northStatus = new JTextField ( 10 ) ;

JTextField westStatus = new JTextField ( 10 ) ;

JTextField centerStatus = new JTextField ( 10 ) ;

/**

 * The constructor 

 */

public MainFrame ( String str ) {

super ( str ) ;

// add the components to each panel and sets its format

northPanel.setLayout ( new FlowLayout ( FlowLayout.CENTER ) ) ;

northPanel.add ( resetButton ) ;

northPanel.add ( exitButton ) ;

eastPanel.setLayout ( new GridLayout ( 4,1 ) ) ;

eastPanel.add (northCheck ) ;

eastPanel.add (southCheck ) ;

eastPanel.add (westCheck ) ;

eastPanel.add (centerCheck ) ;

westPanel.setLayout ( new GridLayout ( 4,1 ) ) ;

westPanel.add ( red ) ;

westPanel.add ( green ) ;

westPanel.add ( blue ) ;

westPanel.add ( black ) ;

// Adding buttons into a ButtonGroup object allows only

// one button at a time to be selected

colorGroup.add ( red ) ;

colorGroup.add ( green ) ;

colorGroup.add ( blue ) ;

colorGroup.add ( black ) ;

centerPanel.setLayout ( new BorderLayout ( ) ) ;

centerPanel.add ( northButton, "North") ;

centerPanel.add (southButton, "South") ;

centerPanel.add (eastButton, "East") ;

centerPanel.add (westButton, "West") ;

centerPanel.add (centerButton, "Center") ;

southPanel.setLayout ( new FlowLayout(FlowLayout.CENTER ) ) ;

southPanel.add ( northStatus ) ;

southPanel.add ( westStatus ) ;

southPanel.add ( centerStatus ) ;

// set up panels in frame

this.getContentPane ( ).setLayout(new BorderLayout ( ) ) ;

getContentPane ( ).add(northPanel, "North" ) ;

getContentPane ( ).add(southPanel, "South" ) ;

getContentPane( ).add(eastPanel, "East" ) ;

getContentPane( ).add(westPanel, "West" ) ;

getContentPane( ).add(centerPanel, "Center" ) ;

}