Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.Graphics;
import java.awt.Panel;
import java.awt.image.BufferedImage;
import java.io.FileInputStream;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import javax.swing.JFrame;

public class Main extends Panel {
    private BufferedImage images[];

    private int imageIndex = 0;

    public Main() throws Exception {
        String filename = "a.png";
        FileInputStream inputStream = new FileInputStream(filename);
        String extensionName = filename.substring(filename.lastIndexOf('.') + 1);
        Iterator readers = ImageIO.getImageReadersBySuffix(extensionName);
        ImageReader imageReader = (ImageReader) readers.next();
        ImageInputStream imageInputStream = ImageIO.createImageInputStream(inputStream);
        imageReader.setInput(imageInputStream, false);
        int num = imageReader.getNumImages(true);
        images = new BufferedImage[num];
        for (int i = 0; i < num; ++i) {
            images[i] = imageReader.read(i);
        }
        inputStream.close();
    }

    public void paint(Graphics g) {
        if (images == null)
            return;
        g.drawImage(images[imageIndex], 0, 0, null);
        imageIndex = (imageIndex + 1) % images.length;
    }

    static public void main(String args[]) throws Exception {
        JFrame frame = new JFrame();
        Panel panel = new Main();
        frame.add(panel);
        frame.setSize(400, 400);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}