Button class

The JButton class is used to create a button that have plateform-independent implementation.

Commonly used Constructors

• JButton(): creates a button with no text and icon.
• JButton(String s): creates a button with the specified text.
• JButton(Icon i): creates a button with the specified icon object.

Commonly used Methods of AbstractButton class:

1) public void setText(String s): is used to set specified text on button.

2) public String getText(): is used to return the text of the button.

3) public void setEnabled(boolean b): is used to enable or disable the button.

4) public void setIcon(Icon b): is used to set the specified Icon on the button.

5) public Icon getIcon(): is used to get the Icon of the button.

6) public void setMnemonic(int a): is used to set the mnemonic on the button.

7) public void addActionListener(ActionListener a): is used to add the action listener to this object.

Note: The JButton class extends AbstractButton class.

Example of displaying image on the button:

1. import java.awt.event.*;  
2. import javax.swing.*;  
3.   
4. public class ImageButton{  
5. ImageButton(){  
6. JFrame f=new JFrame();  
7.                   
8.           
9. JButton b=new JButton(new ImageIcon("b.jpg"));  
10. b.setBounds(130,100,100, 40);  
11.       
12. f.add(b);  
13.           
14. f.setSize(300,400);  
15. f.setLayout(null);  
16. f.setVisible(true);  
17.           
18. f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
19.           
20.     }  
21.       
22. public static void main(String[] args) {  
23.     new ImageButton();  
24. }  
25. }