JButton is a Swing component that represents a button on a graphical user interface (GUI) in Java. It is a simple component to add to a JPanel, JFrame, or other Swing container, and can be used to perform actions when clicked by the user.

Here's an example of how to create a JButton in Java:

import javax.swing.*;

public class ButtonExample {

    public static void main(String[] args) {
        JFrame frame = new JFrame("Button Example");

        // Create a new JButton object with the label "Click Me"
        JButton button = new JButton("Click Me");

        // Add an ActionListener to the JButton to perform an action when it is clicked
        button.addActionListener(e -> {
            System.out.println("Button was clicked");
        });

        // Add the JButton to the JFrame
        frame.add(button);

        // Set up the JFrame
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 300);
        frame.setVisible(true);
    }
}

In this example, we create a new JButton object with the label "Click Me". We then add an ActionListener to the JButton to perform an action when it is clicked. Finally, we add the JButton to a JFrame and set up the basic attributes of the JFrame.

When the user clicks the JButton, the ActionListener will be triggered and print a message to the console. You can replace this with any action you like, such as opening a new window or performing a database query.