Sunday 11 September 2011

Check boxes, radio buttons and Text area

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//Check boxes, radio buttons and Text area in java swing
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

class CheckRadio extends JFrame implements ActionListener
{
    //vars
    JCheckBox cb1, cb2;
    JRadioButton rb1, rb2;
    JTextArea ta;
    ButtonGroup bg;
    String msg="";

    CheckRadio()
    {
        //create the content pane
        Container c = getContentPane();

        //set flow layout to content pane
        c.setLayout(new FlowLayout());

        //create a text area with 10 rows and 20 chars per row
        ta = new JTextArea(10,20);

        //create two check boxes
        cb1 = new JCheckBox("Java", true);
        cb2 = new JCheckBox("J2EE");

        //create two radio buttons
        rb1 = new JRadioButton("Male", true);
        rb2 = new JRadioButton("Female");

        //create a button group and add the radio buttons to it
        bg = new ButtonGroup();
        bg.add(rb1);
        bg.add(rb2);

        //add the checkboxes, radio buttons, textarea to the container
        c.add(cb1);
        c.add(cb2);
        c.add(rb1);
        c.add(rb2);
        c.add(ta);

        //add action listeners. We need not add listener to text area
        //since the user clicks on the checkboxes or radio buttons only
        cb1.addActionListener(this);
        cb2.addActionListener(this);
        rb1.addActionListener(this);
        rb2.addActionListener(this);
   
        //close the frame upon clicking
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public void actionPerformed(ActionEvent ae)
    {
        //know which components are selected by user
        if(cb1.getModel().isSelected()) msg+="\nJava";
        if(cb2.getModel().isSelected()) msg+="\nJ2EE";    
        if(rb1.getModel().isSelected()) msg+="\nMale";
        else msg+="\nFemale";
        //display the selected message in text area
        ta.setText(msg);

        //reset the message to empty string
        msg="";
     }

    public static void main(String args[])
    {
        //create frame
        CheckRadio cr = new CheckRadio();
        cr.setTitle("My checkboxes and Radio buttons");
        cr.setSize(500,400);
        cr.setVisible(true);
    }
}
CLICK HERE TO DOWNLOAD MORE CODE:

http://www.ziddu.com/download/16351028/advancedjavabookcd.rar.html

1 comments:

  • 12 July 2012 at 04:00
    Anonymous says:

    thank you!

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