radio buttons

write a program to create an applet button which has a list of radio buttons with titles of various colours.set the background colour of the applet to the selected colour

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August 22, 2012 at 2:58 PM

Here is an applet example which has a list of radio buttons with titles of various colors and a button. The given code sets the background color of applet according to the radio button selected by the user.

import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class GetSelectedRadioButton extends Applet implements ItemListener,ActionListener{

        CheckboxGroup gp = null;

        public void init(){
                gp = new CheckboxGroup();
                Checkbox c1 = new Checkbox("RED", gp, true);
                Checkbox c2 = new Checkbox("GREEN", gp, false);
                Checkbox c3 = new Checkbox("BLUE", gp, false);
                Button b=new Button("OK");              
                add(c1);
                add(c2);
                add(c3);
                add(b);

                c1.addItemListener(this);
                c2.addItemListener(this);
                c3.addItemListener(this);
                b.addActionListener(this);
        }

        public void itemStateChanged(ItemEvent ie) {
                repaint();
        }

        public void actionPerformed(ActionEvent e){

                Checkbox chk = gp.getSelectedCheckbox();
                if(chk.getLabel().equals("RED")){
                    setBackground(Color.RED);
                }
                if(chk.getLabel().equals("GREEN")){
                    setBackground(Color.GREEN);
                }
                if(chk.getLabel().equals("BLUE")){
                    setBackground(Color.BLUE);
                }
          }
}

Now to call the above applet, you need to create an html code. Here it is:

<HTML>
<BODY>
<APPLET CODE ="GetSelectedRadioButton.class" WIDTH="800" HEIGHT="500"></APPLET>
</BODY>
</HTML>

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