JCheckBox and JRadioButton in Java with Examples

a) Introduction to JComboBox and JRadioButton

b) How to create JComboBox and JRadioButton ?

c) Example with Source Code

d) Ouput

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Introduction

The JCheckBox and JRadioButton are the swing components. Check box allows you to make the multiple selection whereas radio button allows you single selection. Radio button is generally used in a case where there are multiples selections and you have to choose only one. And Check Box is opposite of radio button. Check box allows you to select the multiple items from multiple items.

How to create JCheckBox and JRadioButton?

e.g;

JCheckBox c1,c2;

JRadioButton r1,r2;

C1=new JCheckBox(“Music”);

C2=new JCheckBox(“Reading”);

R1=new JRadioButton(“male”);

R2=new JRadioButton(“female”);

Note: In SWING all the radio buttons can be selected by default.

So to make single selection of radio button, we need to use ButtonGroup class.

For e.g.

ButtonGroup bg=new ButtonGroup();

Bg.add(r1);

Bg.add(r2);

[Note: isSelected() method is used to return true if radio button or check box is selected otherwise it returns false.]

Let us see the example of check box and radio button;

Source Code:

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/**

* @author AnkitPC

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class JCheckBoxandJRadioButtonDemo implements ActionListener {

JFrame f;

JLabel l1,l2,l3,l4;

JTextField t1,t2;

JRadioButton b1,b2;

JCheckBox c1,c2,c3;

JButton b;

//creating constructor

JCheckBoxandJRadioButtonDemo(){

f=new JFrame("Form");

//setting the size

f.setSize(400,300);

f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

//setting the layout

f.setLayout(new FlowLayout());

l1=new JLabel("Name");

l2=new JLabel("Address");

l3=new JLabel("Gender");

l4=new JLabel("Hobbies");

t1=new JTextField(20);

t2=new JTextField(20);

//for radio button to select only one

ButtonGroup bg=new ButtonGroup();

b1=new JRadioButton("Male");

b2=new JRadioButton("Female");

bg.add(b1);

bg.add(b2);

c1=new JCheckBox("Music");

c2=new JCheckBox("Reading");

c3=new JCheckBox("Travelling");

b=new JButton("Submit");

b.addActionListener(this);

//adding the components

f.add(l1);

f.add(t1);

f.add(l2);

f.add(t2);

f.add(l3);

f.add(b1);

f.add(b2);

f.add(l4);

f.add(c1);

f.add(c2);

f.add(c3);

f.add(b);

f.setVisible(true);

}

public static void main(String[] args) {

//calling constructor

new JCheckBoxandJRadioButtonDemo();

}

public void actionPerformed(ActionEvent e){

String name=t1.getText();

String address=t2.getText();

String gender="";

String hobbies="";

// JOptionPane jp=new JOptionPane();

//for radio button

if(b1.isSelected()){

gender="Male";

}

else if(b2.isSelected()){

gender="Female";

}

//for checkbox

if(c1.isSelected()){

hobbies="Music";

}

if(c2.isSelected()){

hobbies+="Reading";

}

if(c2.isSelected()){

hobbies+="Travelling";

}

JOptionPane.showMessageDialog(null,"Name: "+name+ " \n Address: "+address+ "\n Gender: "+gender +"\nHobbies: "+hobbies);

}

Output:

The image below is the initial output of the program above.

I have entered the details in the fields.

If I click the submit button I will get the message dialog with the details I entered.

In this program, we have covered the some previous lessons.

Here are the some differences in JCheckBox and JRadioButton are;

JCheckBox	JRadioButton
To create check box, we use JCheckBox class.	To create check box, we use JRadioButton class.
No need of helper class to create checkbox.	ButtonGroup helper class is used to create radio button.
There can be multiple selections in check box.	Single selection of item.

JCheckBox and JRadioButton in Java with Examples