Question

所以我在这里遇到麻烦。我应该写一个程序，要求在汽车中加速/制动方法。我在代码的前半部分收到语法错误，但后半部分被标记为正确。

Car上课：

public class Car {
    private int yearModel;
    private String make;
    private int speed;

    public Car(String m, int year) {
        yearModel = year;
        make = m;
        speed = 0;
    }

    // Declare mutators (methods).

    // Declare accessors (methods).
    public int getModel() { // Model year of car.
        return yearModel;
    }

    public String getMake() {
        return make;
    }

    public int getSpeed() {
        return speed;
    }

    public void setModel(int year) {
        yearModel = year;
    }

    public void setMake(String carMake) {
        make = carMake;
    }

    public void setSpeed(int s) { // Incorrect??? Possible outSpeed = speed;
        speed = s;          // Not sure if correct; should be "0" | or equal to "carSpeed"
    }

    public void accelerateSpeed() {
        speed += 5;
        // Each call will increase by 5.
    }

    public void brakeSpeed() {
        speed -= 5;
        // Each call will decrease by 5.
    }
}

CarResults上课：

import javax.swing.JOptionPane;

class CarResults {
    public static void main(String[] args) {
        String input, carMake;
        int model, yearModel, year, s;

        Car myCar = new Car("Car", 2011);

        // Retrieve car's Make & Model.
        carMake = JOptionPane.showInputDialog("What is the Make of your car? ");
        myCar.setMake(carMake);

        year = Integer.parseInt(JOptionPane.showInputDialog("What is the Model Year of your car? "));
        myCar.setModel(year);

        input = JOptionPane.showInputDialog("Enter your car's speed: ");
        s = Integer.parseInt(input);
        myCar.setSpeed(s);

        for (int i = 0; i < 5; i++) {
            myCar.accelerateSpeed();
            System.out.println();
            System.out.println("The " + " " + myCar.getModel() + " " + myCar.getMake() +
                " is gradually accelerating. ");

            // Apply acceleration.
            System.out.println("Your current speed is: " + myCar.getSpeed());
        }

        // Begin applying brakes.
        System.out.println();
        System.out.println("\t>>> Now, let's get the results for applying the brakes... ");
        System.out.println();

        for (int i = 0; i < 5; i++) {
            myCar.brakeSpeed();
            System.out.println();
            System.out.println("[Braking] Your" + " " + myCar.getModel() + " " + myCar.getMake() + " is now traveling at: ");

            // Apply brakes.

            System.out.println("Now your speed is: " + myCar.getSpeed());
        }

        // End the program.
        System.exit(0);
    }
}

Answer 1

我不认为这有什么不妥。我能够编译并运行它就好了。尝试使用

在命令行上进行编译

javac CarResults.java Car.java

然后用

运行它

java CarResults

令牌上的语法错误，Eclipse中错误放置的构造

1 个答案: