What is the importance of JViewport class in Java?

JViewport

• A JViewport class defines the basic scrolling model and it is designed to support both logical scrolling and pixel-based scrolling.
• The viewport's child called the view is scrolled by calling JViewport.setViewPosition() method.
• A JViewport class supports logical scrolling, that is a kind of scrolling in which view coordinates are not pixels.
• To support a logical scrolling, JViewport defines a small set of methods that can be used to define the geometry of a viewport and a view. By default, these methods just report the pixel dimensions of the viewport and view.

Example

import java.awt.*; import javax.swing.*; public class JViewportTest extends JFrame {    public JViewportTest() {       setTitle("JViewport Test");       setLayout(new FlowLayout());       JLabel label = new JLabel(new ImageIcon("C:/Users/User/Desktop/Java Answers/logo.jpg"));       JViewport viewport = new JViewport();       viewport.setView(label);       viewport.setExtentSize(new Dimension(350, 350));       viewport.setViewPosition(new Point(50, 25));       viewport.setPreferredSize(new Dimension(350, 275));       add(viewport);       setSize(400, 300);       setLocationRelativeTo(null);       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       setVisible(true);    }    public static void main(String[] args) {       new JViewportTest();    } }

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