java - 自从我添加了 super 关键字后，代码就没有输出任何内容

Question

使用继承概念，我在卡车和汽车类之间有共同的变量，例如气缸数量和颜色，最重要的是，卡车类有一个用于牵引能力的变量，而汽车类有一个用于数量的变量座位。因此，我决定使用关键字super来引用父类，但似乎没有输出。

import java.util.Scanner;
class Vehicle {
    String color;
    int noOfCylinders;
    public Vehicle(String color, int noOfCylinders) {
        this.color = "Black";
        this.noOfCylinders = 0;
    }
    public void setColor(String c) {
        color = c;
    }
    public String getColor() {
        return color;
    }
    public void setNoOfCylinders(int noOfCyl) {
        noOfCylinders = noOfCyl;
    }
    public int getNoOfCylinders() {
        return noOfCylinders;
    }
    public String toString() {
        String information;
        information = "is " + color + " and it has " + noOfCylinders + " cylinders";
        return information;
    }
}
public class CreateVehicle {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        Car CarObject = new Car(s.nextLine(), s.nextInt(), s.nextInt());
        Truck TruckObject = new Truck(s.nextLine(), s.nextInt(), s.nextInt());
        System.out.print("Enter the color of the car: ");
        CarObject.setColor(s.nextLine());
        System.out.print("Enter the number of cylinders in the car: ");
        CarObject.setNoOfCylinders(s.nextInt());

        System.out.print("Enter the number of seats in the car: ");
        CarObject.setNoOfSeats(s.nextInt());
        s.nextLine();
        System.out.print("\nEnter the color of the truck: ");
        TruckObject.setColor(s.nextLine());
        System.out.print("Enter the number of cylinders in the truck: ");
        TruckObject.setNoOfCylinders(s.nextInt());

        System.out.print("Enter the towing capacity of the truck (lbs): ");
        TruckObject.setTowingCapacity(s.nextInt());
        System.out.print(("\nThe car ") + CarObject.toString() + ". ");
        System.out.print(("\nThe truck ") + TruckObject.toString()+ ". ");  
    }
}
class Car extends Vehicle {
    private int noOfSeats;
    public Car(String color, int noOfCylinders, int seatNum) {
        super(color, noOfCylinders);
        this.noOfSeats = seatNum;
    }
    public void setNoOfSeats(int noOfSeat) {
        noOfSeats = noOfSeat;
    }

    public String toString() {
        System.out.print("The car has " + noOfSeats + " seats."); 

        return super.toString();
    }   
}
class Truck extends Vehicle {
    private int towingCapacity;
    public Truck(String color, int noOfCylinders, int capacityTowing) {
        super(color, noOfCylinders);
        this.towingCapacity = capacityTowing;
    }

    public void setTowingCapacity(int towingCapacityTruck) {
        towingCapacity = towingCapacityTruck;
    }

    public String toString() {
        System.out.print ("The truck has a towing capacity of " + towingCapacity + " lbs."); 
        return super.toString();
    }
}

*

Answer 1

    package problems;

import java.util.Scanner;

public class CreateVehicle {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        Car CarObject = new Car(s.next(), s.nextInt(), s.nextInt());
        Truck TruckObject = new Truck(s.next(), s.nextInt(), s.nextInt());
        System.out.print("Enter the color of the car: ");
        CarObject.setColor(s.next());
        System.out.print("Enter the number of cylinders in the car: ");
        CarObject.setNoOfCylinders(s.nextInt());

        System.out.print("Enter the number of seats in the car: ");
        CarObject.setNoOfSeats(s.nextInt());
        s.nextLine();
        System.out.print("\nEnter the color of the truck: ");
        TruckObject.setColor(s.next());
        System.out.print("Enter the number of cylinders in the truck: ");
        TruckObject.setNoOfCylinders(s.nextInt());

        System.out.print("Enter the towing capacity of the truck (lbs): ");
        TruckObject.setTowingCapacity(s.nextInt());
        System.out.print(("\nThe car ") + CarObject.toString() + ". ");
        System.out.print(("\nThe truck ") + TruckObject.toString() + ". ");
    }
}

class Truck extends Vehicle {
    private int towingCapacity;
    public Truck(String color, int noOfCylinders, int capacityTowing) {
        super(color, noOfCylinders);
        this.towingCapacity = capacityTowing;
    }

    public void setTowingCapacity(int towingCapacityTruck) {
        towingCapacity = towingCapacityTruck;
    }

    public String toString() {
        System.out.print ("The truck has a towing capacity of " + towingCapacity + " lbs."); 
        return super.toString();
    }
}


class Car extends Vehicle {
    private int noOfSeats;
    public Car(String color, int noOfCylinders, int seatNum) {
        super(color, noOfCylinders);
        this.noOfSeats = seatNum;
    }
    public void setNoOfSeats(int noOfSeat) {
        noOfSeats = noOfSeat;
    }

    public String toString() {
        System.out.print("The car has " + noOfSeats + " seats."); 

        return super.toString();
    }   
}

class Vehicle {
    String color;
    int noOfCylinders;
    public Vehicle(String color, int noOfCylinders) {
        this.color = "Black";
        this.noOfCylinders = 0;
    }
    public void setColor(String c) {
        color = c;
    }
    public String getColor() {
        return color;
    }
    public void setNoOfCylinders(int noOfCyl) {
        noOfCylinders = noOfCyl;
    }
    public int getNoOfCylinders() {
        return noOfCylinders;
    }
    public String toString() {
        String information;
        information = "is " + color + " and it has " + noOfCylinders + " cylinders";
        return information;
    }
}

我刚刚将 nextLine 更改为 next，假设您只期望一个单词作为输入，它是一个颜色字符串。结果成功了。