Java JButton

Java JButton

Java JButton class is used to create a labeled button.When JButton is clicked a certain action is implemented by class  addActionListener
To use JButton first you need to import it as a swing component.

Java JButton class declaration Syntax 

[public class JButton extends AbstractButton implements Accessible]

JButton Common used Constructors

Below  are some of the commonly used JButton constructors.

• JButton()-create empty button with no text or icon.
• JButton(String s)-create button with a string 
• JButton(Icon icon)-create button with icon.

Common used JButton AbstractButton class methods.

• void setToolTipText(String s)-sets a strings that is displayed whenever user hovers mouse cursor over the button.
• String getText()-returns JButton string.
• void setEnabled(boolean)-enables or disables the JButton.
• void setIcon(Icon icon)-adds icon to JButton.
• Icon getIcon()-retrieves icon used in JButton.
• void setMnemonic(int a)-used to set JButton mnemonic.
• void addActionListener(ActionListener listener)-used to add action listener to the JButton. 

Java JButton Example

[

import javax.swing.JFrame;
import javax.swing.JButton;
public class JavaJButton {

    public static void main(String args[])
    {
        JFrame frame=new JFrame("Jbutton Example");
        JButton button=new JButton("Save");

        button.setBounds(50,100,95,30);
        frame.add(button);
        frame.setSize(400,400);
        frame.setLayout(null);
        frame.setVisible(true);

    }
}

]

 Example to Display Icon to the JButton.

[

import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.ImageIcon;
public class JavaJButton {

    public static void main(String args[])
    {
        JFrame frame=new JFrame("Jbutton Example");
        JButton button=new JButton();
        button.setIcon(new ImageIcon(JavaJButton.class.getResource("save.png")));

        button.setBounds(100,100,95,30);
        frame.add(button);
        frame.setSize(400,400);
        frame.setLayout(null);
        frame.setVisible(true);



    }

}

]

Result

Adding ActionListener to JButton

[

import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.ImageIcon;
import javax.swing.JTextField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class JavaJButton {

    public static void main(String args[])
    {
        JFrame frame=new JFrame("Jbutton Example");
        JButton button=new JButton("Save");

        JTextField field=new JTextField();
        field.setBounds(50,50, 150,20);
        frame.add(field);
        button.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent event)
            {
                field.setText("I Love Java");

            }


        });


        button.setBounds(100,100,95,30);
        frame.add(button);
        frame.setSize(400,400);
        frame.setLocationRelativeTo(null);
        frame.setLayout(null);
        frame.setVisible(true);



    }

}

]

Output:

When button is clicked below code is executed that set text in the JTextField to I love Java

[

button.addActionListener(new ActionListener()
{
    public void actionPerformed(ActionEvent event)
    {
        field.setText("I Love Java");

    }


});

]

Read more about JButton Methods here.