How do so an if statement in with a boolean veriable [closed]

I have made this function where I can change the price of a car if it has not already been but I cannot understand why this still works when if sold is already set as true.

public void changeThePrice(int newPrice)
    {
        if (sold == false)
         {
           price = newPrice;
        }
        
        else
           {System.out.println("This car has already been sold to");
            }
    }