Java JButton

The JButton class is used to create a labeled button that has platform independent implementation. The application result in some action when the button is pushed. It inherits AbstractButton class.

JButton class declaration

Let's see the declaration for javax.swing.JButton class.

1. public class JButton extends AbstractButton implements Accessible  

Commonly used Constructors:

Constructor	Description
JButton()	It creates a button with no text and icon.
JButton(String s)	It creates a button with the specified text.
JButton(Icon i)	It creates a button with the specified icon object.

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Commonly used Methods of AbstractButton class:

Methods	Description
void setText(String s)	It is used to set specified text on button
String getText()	It is used to return the text of the button.
void setEnabled(boolean b)	It is used to enable or disable the button.
void setIcon(Icon b)	It is used to set the specified Icon on the button.
Icon getIcon()	It is used to get the Icon of the button.
void setMnemonic(int a)	It is used to set the mnemonic on the button.
void addActionListener(ActionListener a)	It is used to add the action listener to this object.

Java JButton Example

1. import javax.swing.*;    
2. public class ButtonExample {  
3. public static void main(String[] args) {  
4.     JFrame f=new JFrame("Button Example");  
5.     JButton b=new JButton("Click Here");  
6.     b.setBounds(50,100,95,30);  
7.     f.add(b);  
8.     f.setSize(400,400);  
9.     f.setLayout(null);  
10.     f.setVisible(true);   
11. }  
12. }  

Output:

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Java JButton Example with ActionListener

1. import java.awt.event.*;  
2. import javax.swing.*;    
3. public class ButtonExample {  
4. public static void main(String[] args) {  
5.     JFrame f=new JFrame("Button Example");  
6.     final JTextField tf=new JTextField();  
7.     tf.setBounds(50,50, 150,20);  
8.     JButton b=new JButton("Click Here");  
9.     b.setBounds(50,100,95,30);  
10.     b.addActionListener(new ActionListener(){  
11. public void actionPerformed(ActionEvent e){  
12.             tf.setText("Welcome to Javatpoint.");  
13.         }  
14.     });  
15.     f.add(b);f.add(tf);  
16.     f.setSize(400,400);  
17.     f.setLayout(null);  
18.     f.setVisible(true);   
19. }  
20. }  

Output:

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Example of displaying image on the button:

1. import javax.swing.*;      
2. public class ButtonExample{    
3. ButtonExample(){    
4. JFrame f=new JFrame("Button Example");            
5. JButton b=new JButton(new ImageIcon("D:\\icon.png"));    
6. b.setBounds(100,100,100, 40);    
7. f.add(b);    
8. f.setSize(300,400);    
9. f.setLayout(null);    
10. f.setVisible(true);    
11. f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    
12.     }         
13. public static void main(String[] args) {    
14.     new ButtonExample();    
15. }    
16. }    

Output: