使用变量调用访问器

我通过做一些基本练习来练习我的Java技能,让自己去尝试,我想你可以说,我正在尝试做一个愚蠢的简单“基于文本的比赛游戏”。唯一的逻辑是,无论哪辆车更强大,都会获胜,而我在这里试图学习的要点是OOP。我有4个其他类(Supra、RX7、MX5和S2000)并调用它们。在我的方法“race”中,我将用户选择的汽车设置为一个名为“userCar”的变量。我正在尝试调用userCar上的getHorsepower()访问器,以便计算谁会获胜。我的意图是,如果“userCar”是“supra”,那么“userCar.getHorsepower()”将与“supra.getHorse()”相同。但是,我收到一个错误,说它无法解析if语句中的getHorsepower方法。我相信这是因为我正在尝试调用varable上的访问者,如果是这样,我可以做什么来解决这个问题?或者这可能是一个不同的问题。

非常感谢。 纳什

精确错误: 错误:(100,20)java:找不到符号 符号:方法getHorsepower() 位置:java.lang.String类型的变量userCar

  import java.util.Scanner;

public class Cars{

    private static Scanner in = new Scanner(System.in);

    private int horsepower;
    private int year;
    private String coo;

    public static void main(String args[])
    {
        Supra supra = new Supra();
        RX7 rx7 = new RX7();
        MX5 mx5 = new MX5();
        S2000 s2000 = new S2000();

        supra.specs();
        rx7.specs();
        mx5.specs();
        s2000.specs();

        System.out.println("Supra: " + supra.getHorsepower() + "HP");
        System.out.println("RX7: " + rx7.getHorsepower() + "HP");
        System.out.println("S2000: " + s2000.getHorsepower() + "HP");
        System.out.println("MX5 (Miata): " + mx5.getHorsepower() + "HP");

        race();
    }

    public void setHorsepower(int h)
    {
        this.horsepower = h;
    }
    public int getHorsepower()
    {
        return horsepower;
    }


    public static void race()
    {
        Supra supra = new Supra();
        RX7 rx7 = new RX7();
        MX5 mx5 = new MX5();
        S2000 s2000 = new S2000();

        supra.specs();
        rx7.specs();
        mx5.specs();
        s2000.specs();

        String userCar = "";
        String compCar = "";

        System.out.println("Choose a car to race");
        System.out.println("1) Supra | 2) RX7 | 3) S2000 | 4) MX5 (Miata)");
        int userChoice = in.nextInt();
        System.out.println("Choose a car to race against");
        int compChoice = in.nextInt();

        if(userChoice == 1)
            userCar = "supra";
        else if(userChoice == 2)
            userCar = "rx7";
        else if(userChoice == 3)
            userCar = "s2000";
        else if(userChoice == 4)
            userCar = "mx5";

        if(compChoice == 1)
            compCar = "supra";
        else if(compChoice == 2)
            compCar = "rx7";
        else if(compChoice == 3)
            compCar = "s2000";
        else if(compChoice == 4)
            compCar = "mx5";

        if (userCar.getHorsepower() > compCar.getHorsepower())
        {
            System.out.println("You won!");
        } else { System.out.println("That's embarrassing."); }

    }

}