Reader.java

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;

public class Reader extends JFrame implements KeyListener {
    private Manga book;
    private int totalPages = 0;
    private int currentPage = 1;
    private Page pageImage = null;

    public Reader(Manga book) {
        this.book = book;
        totalPages = book.length();
        
        Toolkit tooklit = Toolkit.getDefaultToolkit();
        
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
		updateTitle();
        setSize(1280, (int)tooklit.getScreenSize().getHeight());

        try {
            pageImage = new Page(book.getPage(currentPage));
        } catch (Exception e) {
            e.printStackTrace();
        }

        setLayout(new BorderLayout());
        add(pageImage, BorderLayout.CENTER);

    }

	private void updateTitle() {
		setTitle(book.getName() + " - Page " + currentPage + " of " + totalPages);
	}

	public void run() {
		addKeyListener(this);

        setVisible(true);
	}

    public void keyTyped(KeyEvent e) {}
    public void keyPressed(KeyEvent e) {

		boolean isRight = e.getKeyCode() == KeyEvent.VK_RIGHT || e.getKeyCode() == KeyEvent.VK_D;
		boolean isLeft = e.getKeyCode() == KeyEvent.VK_LEFT || e.getKeyCode() == KeyEvent.VK_A;

        if(isRight && currentPage + 1 < totalPages) {
            currentPage += 1;
			pageImage.updatePage(book.getPage(currentPage));
        }
        
		if(isLeft && currentPage - 1 > 0) {
            currentPage -= 1;
			pageImage.updatePage(book.getPage(currentPage));
		}

        if (pageImage != null) {
            pageImage.repaint();
        }

        updateTitle();
    }
    
    public void keyReleased(KeyEvent e) {}
}