Tester.java

import java.awt.*;
public class Tester{
  public static void main(String[] args){
    MainFrame m = new MainFrame();
    ACanvas arrayCanvas = new ACanvas();
    Canvas a = new Canvas();
    a.setBackground(Color.red);
    a.setBounds(100,100,200,200);
    ACanvas b = new ACanvas();
    b.setBackground(Color.blue);
    b.setBounds(150, 150, 25, 25);
    arrayCanvas.setSize(200,200);
    arrayCanvas.setBackground(Color.BLACK);
    m.add(arrayCanvas);
    try {
      Thread.sleep(1000);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
    arrayCanvas.setSize(500,500);
    arrayCanvas.add(b);
    arrayCanvas.add(a);
    arrayCanvas.add(new ACanvas(0,0,100,100, Color.white));
    for (int i = 0; i <51; i++){
      arrayCanvas.add(new ACanvas(i*2, i*2, 50,50, new Color((int)(Math.random()*255), (int)(Math.random()*255), (int)(Math.random()*255))));
      arrayCanvas.paint();
      try {
        Thread.sleep(100);
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }
    arrayCanvas.paint();
  }
}