/*ColorChange.java*/
import java.awt.FlowLayout;
import java.awt.Color;
import javax.swing.JFrame;
import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;
import javax.swing.JRadioButton;
import javax.swing.ButtonGroup;

public class ColorChange extends JFrame{
	//declare button variables
	private JRadioButton redButton;
	private JRadioButton blueButton;
	private JRadioButton greenButton;
	private JRadioButton magentaButton;
	private ButtonGroup radioGroup;
//use example of font
	public ColorChange(){
		super("colours test");
		setLayout( new FlowLayout());//set layout
		//radio buttons
		redButton = new JRadioButton( "Red", true );
		blueButton = new JRadioButton( "Blue", false );
		greenButton = new JRadioButton( "Green", false );
		magentaButton = new JRadioButton( "Magenta", false );
		//add to JFrame
		add( redButton );
		add( blueButton );
		add( greenButton );
		add( magentaButton );
		//add to the buttongroup
		radioGroup = new ButtonGroup();
		radioGroup.add( redButton );
		radioGroup.add( blueButton );
		radioGroup.add( greenButton );
		radioGroup.add( magentaButton );
		//register events
		redButton.addItemListener(new RadioButtonHandler(Color.RED));
		blueButton.addItemListener(new RadioButtonHandler(Color.BLUE));
		greenButton.addItemListener(new RadioButtonHandler(Color.GREEN));
		magentaButton.addItemListener(new RadioButtonHandler(Color.MAGENTA));
		//set the initial red colour
		getContentPane().setBackground( Color.RED );
	}//end of constructor

	//handling events
	private class RadioButtonHandler implements ItemListener{
		private Color colour;

		public RadioButtonHandler( Color targetColour){//constructor taking a color object
			colour = targetColour;
		}//end of constructor
		//alas, ItemListener returns 2 events not one http://www.daniweb.com/software-development/java/threads/481137/change-content-pane-colour-program-first-stab so need to check which one it is
		//I can instead use actionListener
		public void itemStateChanged( ItemEvent event ){
			if(event.getStateChange() == ItemEvent.SELECTED ){
				getContentPane().setBackground( colour );
			}
		}//end of method

	}//end of inner class

}//end of class


/*ColorChangeTest.java*/
import javax.swing.JFrame;
import java.awt.Dimension;
public class ColorChangeTest{
	public static void main( String[] args ){
		ColorChange colorChange = new ColorChange();
		colorChange.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
		colorChange.setVisible( true );
		Dimension minimumSize = new Dimension( 400, 200 );
		colorChange.setMinimumSize( minimumSize );
		colorChange.pack();
	}//end of main
}//end of class