Java JCheckBox

by Online Tutorials Library July 14, 2022

Java JCheckBox

The JCheckBox class is used to create a checkbox. It is used to turn an option on (true) or off (false). Clicking on a CheckBox changes its state from “on” to “off” or from “off” to “on “.It inherits JToggleButton class.

JCheckBox class declaration

Let’s see the declaration for javax.swing.JCheckBox class.

Commonly used Constructors:

Constructor	Description
JJCheckBox()	Creates an initially unselected check box button with no text, no icon.
JChechBox(String s)	Creates an initially unselected check box with text.
JCheckBox(String text, boolean selected)	Creates a check box with text and specifies whether or not it is initially selected.
JCheckBox(Action a)	Creates a check box where properties are taken from the Action supplied.

Commonly used Methods:

Methods	Description
AccessibleContext getAccessibleContext()	It is used to get the AccessibleContext associated with this JCheckBox.
protected String paramString()	It returns a string representation of this JCheckBox.

Java JCheckBox Example

 import javax.swing.*; public class CheckBoxExample {  CheckBoxExample(){     JFrame f= new JFrame(“CheckBox Example”);     JCheckBox checkBox1 = new JCheckBox(“C++”);     checkBox1.setBounds(100,100, 50,50);     JCheckBox checkBox2 = new JCheckBox(“Java”, true);     checkBox2.setBounds(100,150, 50,50);     f.add(checkBox1);     f.add(checkBox2);     f.setSize(400,400);     f.setLayout(null);     f.setVisible(true);  } public static void main(String args[])     {     new CheckBoxExample();     }} 

Output:

JAVA Jcheckbox 1

Java JCheckBox Example with ItemListener

 import javax.swing.*; import java.awt.event.*;   public class CheckBoxExample   {        CheckBoxExample(){           JFrame f= new JFrame(“CheckBox Example”);           final JLabel label = new JLabel();                   label.setHorizontalAlignment(JLabel.CENTER);           label.setSize(400,100);           JCheckBox checkbox1 = new JCheckBox(“C++”);           checkbox1.setBounds(150,100, 50,50);           JCheckBox checkbox2 = new JCheckBox(“Java”);           checkbox2.setBounds(150,150, 50,50);           f.add(checkbox1); f.add(checkbox2); f.add(label);           checkbox1.addItemListener(new ItemListener() {                public void itemStateChanged(ItemEvent e) {                                label.setText(“C++ Checkbox: ”                    + (e.getStateChange()==1?”checked”:”unchecked”));                }             });           checkbox2.addItemListener(new ItemListener() {                public void itemStateChanged(ItemEvent e) {                                label.setText(“Java Checkbox: ”                    + (e.getStateChange()==1?”checked”:”unchecked”));                }             });           f.setSize(400,400);           f.setLayout(null);           f.setVisible(true);        }   public static void main(String args[])   {       new CheckBoxExample();   }   }   

Output:

JAVA Jcheckbox 2

Java JCheckBox Example: Food Order

 import javax.swing.*; import java.awt.event.*; public class CheckBoxExample extends JFrame implements ActionListener{ JLabel l; JCheckBox cb1,cb2,cb3; JButton b; CheckBoxExample(){ l=new JLabel(“Food Ordering System”); l.setBounds(50,50,300,20); cb1=new JCheckBox(“Pizza @ 100”); cb1.setBounds(100,100,150,20); cb2=new JCheckBox(“Burger @ 30”); cb2.setBounds(100,150,150,20); cb3=new JCheckBox(“Tea @ 10”); cb3.setBounds(100,200,150,20); b=new JButton(“Order”); b.setBounds(100,250,80,30); b.addActionListener(this); add(l);add(cb1);add(cb2);add(cb3);add(b); setSize(400,400); setLayout(null); setVisible(true); setDefaultCloseOperation(EXIT_ON_CLOSE); } public void actionPerformed(ActionEvent e){ float amount=0; String msg=””; if(cb1.isSelected()){ amount+=100; msg=”Pizza: 100n”; } if(cb2.isSelected()){ amount+=30; msg+=”Burger: 30n”; } if(cb3.isSelected()){ amount+=10; msg+=”Tea: 10n”; } msg+=”—————–n”; JOptionPane.showMessageDialog(this,msg+”Total: “+amount); } public static void main(String[] args) { new CheckBoxExample(); } } 

Output:

JAVA Jcheckbox 21 JAVA Jcheckbox 22

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