I’m currently studying abstract classes in Java, and I tried to run the abstract example in the lecture video I’m studying, but I’m not getting the results I’m expecting. (The lecture video didn’t show the results/didn’t run the code after, so I ran it myself.)

Here are the codes:

public abstract class AbstractClothing {
    private int id;

    public int getId() {
        return id;
    }

    public void setId(int _id) {
        this.id = _id;
    }

    protected abstract double getPrice();
    protected abstract void display();
}

public class Socks extends AbstractClothing {
    private double price;

    public Socks(int _id, double price) {
        this.setId(_id);
    }

    @Override
    protected double getPrice() {
        System.out.println(price); // I also don't know why there's println here, but I just followed the code in the video
        return price;
    }

    @Override
    protected void display() {
        System.out.println("Price is " + this.getPrice());
        System.out.println("Id is " + this.getId());
    }
}

public class WorkingWithAbstractClasses {
    public static void main(String[] args) {
        Socks mySocks = new Socks(4, 4.50);
        mySocks.setId(3);
        mySocks.display();
    }
}

The output I’m getting is:

0.0
Price is 0.0
Id is 3

I’m expecting the output to be like this:

4.50
Price is 4.50
Id is 3

I don’t understand why the price is 0.0 and not 4.50.

I tried to check the variable price and its value in debug mode (though I admit I’m not yet great at debugging), but it also says 0.0 there. Shouldn’t the value of price be 4.50 because I assigned price = 4.50 when I instantiated mySocks? (I’m not sure if it matters, but I’m using IntelliJ.)