BUT2/DEV/DEV3.1/TP02/Part1/ImageManager.java

import java.io.File;

import javax.swing.ImageIcon;

public class ImageManager {

    private ImageIcon[] images; 
    public int cursor;
    
    public ImageManager() {
        File resourcesDirectory = new File("../resources/");

        if(resourcesDirectory.exists() && resourcesDirectory.isDirectory()) {
            File[] files = resourcesDirectory.listFiles();

            if(files != null) {
                this.images = new ImageIcon[files.length];
                this.cursor = 0;

                for(File file : files) {
                    this.images[this.cursor] = new ImageIcon(file.getPath());
                    this.cursor++;
                }

                this.cursor = 0;
            }
        }
    }

    public ImageIcon getNextImage() {
        if(this.cursor >= this.images.length - 1) {
            this.cursor = 0;
        } else {
            this.cursor++;
        }

        return this.images[this.cursor];
    }

    public ImageIcon getPreviousImage() {
        if(this.cursor <= 0) {
            this.cursor = this.images.length - 1;
        } else {
            this.cursor--;
        }

        return this.images[this.cursor];
    }
}