public class Boxes implements Color {
  public static void main(String[] args) {
    Box[] b = { new Box(randColor()), new Box(randColor()), new Box(randColor()) };
    Box target = new Box(Color.BLUE);
    System.out.println(target);
    boolean found = false;
    for (int i=0 ; i < b.length ; i++) {
      System.out.println("Box "+i+": "+b[i]);
      if (target.equals(b[i])) found = true;
    }
    System.out.println("Blue box found? " + found);
  }
  public static int randColor() {
    return MyMath.randInt(Color.BLUE,Color.YELLOW);
  }
}
class Box implements Color {
  private int color = Color.BLUE;
  public Box(int color) {
    this.color=color;
  }
  public int getColor() { return color; }
  public boolean equals(Object other) {
    return color==((Box)other).color;
  }
  public String toString() {
    switch (color) {
      case Color.BLUE:
        return "Blue";
      case Color.RED:
        return "Red";
      case Color.YELLOW:
        return "YELLOW";
      default:
        return "UNKNOWN";
    }
  }
}
interface Color {
  public final int BLUE = 0;
  public final int RED = BLUE+1;
  public final int YELLOW = RED+1;
}

class MyMath {
  public static int randInt(int low, int high) {
    return (int) (Math.random()*(high-low+1)) + (int)low;
  }
}