退出代码0而不是打印？

Question

我编写了以下Java代码，运行时它说：“进程以退出代码0完成”，而不是打印totalNumCars（）。为什么会这样，我该如何解决？

public class ParkingGarage extends Module5{

    public int numAutomobiles;
    public int numLargeAutomobiles;
    public static int numGarages;

    public ParkingGarage(int automobiles, int largeAutomobiles){
        numAutomobiles = automobiles;
        numLargeAutomobiles = largeAutomobiles;
        numGarages++;
    }

    public void addCars(int newAutomobiles, int newLargeAutomobiles){
        numAutomobiles += newAutomobiles;
        numLargeAutomobiles += newLargeAutomobiles;
    }

    public int totalNumCars(){
        int totalCars = numLargeAutomobiles + numAutomobiles;
        return totalCars;
    }

    public static void main(String[] args){
        ParkingGarage garage1 = new ParkingGarage(5,5);
        garage1.addCars(5, 5);
        System.out.println("Number of Cars: " + garage1.totalNumCars());
    }
}