Main.java

package fr.leroideskiwis.allcolors;

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class Main{


    public Main() throws IOException {
        BufferedImage image = new BufferedImage(4096, 4096, 1);

        int i = 0;
        for (int x = 0; x < image.getWidth(); x++) {

            for (int y = 0; y < image.getHeight(); y++) {
                image.setRGB(x, y, i);
                i++;
            }

            //System.out.println("Repainting with x="+x+" and i="+i+" and hex="+Integer.toHexString(i));

        }
        ImageIO.write(image, "png", getFile("./image", "png"));
    }

    private File getFile(String path, String extension){
        File file = new File(path+"."+extension);
        for(int i = 0; file.exists(); i++){
            file = new File(path+i+"."+extension);
        }

        return file;
    }

    public static void main(String[] args) throws IOException {

        new Main();

    }
}