JScrollPane is a Swing component in Java that provides a scrollable view of a component that is too large to be displayed at once, such as a large text area or table. It can be added to any component, and provides a scrollbar that allows the user to scroll through the component's contents.

Here is an example of how to use JScrollPane with a JTextArea:

import javax.swing.*;

public class ScrollPaneExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Scroll Pane Example");
        JTextArea textArea = new JTextArea(20, 30);
        JScrollPane scrollPane = new JScrollPane(textArea);
        frame.getContentPane().add(scrollPane);
        frame.pack();
        frame.setVisible(true);
    }
}

In this example, a JTextArea is created with a size of 20 rows and 30 columns, and then it is added to a JScrollPane. The JScrollPane is then added to the content pane of a JFrame. When the frame is displayed, the text area will be displayed in a scrollable pane. If the contents of the text area are too large to fit in the visible area, a vertical scrollbar will be displayed.