Java - pass object as parameter in constructor

Question

My gaol is to use an instance of a class as parameter for another class. I will describe my problem with an example.

public class Color {

    public String color;
    public Color (String color) {
        this.color = color;
    }
    public Color grey = new Color("grey");
}

My goal is to build another constructor that uses instances of my fist class as parameters (for example a car):

public class car {

    int PS;
    Color color;

    public Auto (int PS, Color color) {
        this.PS = PS;
        this.color = color;
    }

    public static void main (String args[]) {
        car myCar = new car(80, grey);
}

I get the error "Java cannot find symbol". I tried a lot but can't make it run and I don't fully understand the concepts of classes I guess.

Answer 1

Your constructor name and your class name should be the same. Auto is not the same as car. Just change one of them. Also grey is not defined. I believe you want to use Color.grey which means defining it as static.

public class Color {

    public String color;
    public Color (String color) {
        this.color = color;
    }
    public static Color grey = new Color("grey");
}

public class car {

    int PS;
    Color color;

    public car (int PS, Color color) {
        this.PS = PS;
        this.color = color;
    }

    public static void main (String args[]) {
        car myCar = new car(80, Color.grey);
    }
}