import java.util.Arrays;

public class ColorSort {

    enum Color {red, green, blue}

    ;

    public static void main(String[] param) {
        Color[] balls = {Color.BLUE, Color.RED, Color.GREEN, Color.BLUE, Color.RED, Color.GREEN, Color.BLUE, Color.RED, Color.GREEN};
        sortBalls(balls);
        System.out.println(Arrays.toString(balls));
    }

    public static void reorder(Color[] balls) {
        int red = 0, green = 0, blue = 0;
        for (Color ball : balls) {
            switch (ball) {
                case RED -> red++;:
                case GREEN -> green++;:
                case BLUE -> blue++;:
                default -> throw new IllegalArgumentException("Incorrect color");
            }
        }
        for (int i = 0; i < red; i++) {
            balls[i] = Color.RED;
        }
        for (int i = red; i < red + green; i++) {
            balls[i] = Color.GREEN;
        }
        for (int i = red + green; i < red + green + blue; i++) {
            balls[i] = Color.BLUE;
        }
    }
}
    }
            }