Java枚举链接到另一个枚举

public enum Color {
    RED, GREEN, YELLOW;
}

public enum Fruit {
    APPLE(Color.RED),
    BANANA(Color.YELLOW),
    GRAPE(Color.GREEN);

    private final Color color;

    Fruit(Color color) {
        this.color = color;
    }

    public Color getColor() {
        return color;
    }
}

public enum Color {
    RED, GREEN, YELLOW;
}

public enum Fruit {
    APPLE(Color.RED),
    BANANA(Color.YELLOW),
    GRAPE(Color.GREEN);

    private final Color color;

    Fruit(Color color) {
        this.color = color;
    }

    public Color getColor() {
        return color;
    }
}

Fruit apple = Fruit.APPLE;
if (apple == Fruit.APPLE) {
    System.out.println("This is an apple.");
}