Question

需要一些作业帮助，并且在控制台上有一些奇怪的输出。

这是作业问题：

创建一个名为Horse的类，其中包含名称，颜色和出生日期的数据字段年。为这些字段包括get和set方法。接下来，创建一个名为 RaceHorse，其中包含一个附加字段，用于保存其中的比赛数量这匹马曾参加过的比赛以及获得和设置新领域的其他方法。编写一个演示使用每个类的对象的应用程序。将文件另存为 Horse.java，RaceHorse.java和DemoHorses.java。

这是我的代码：

Horse.java

public class Horse {

    private String name;
    private String color;
    private int birthYear;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getColor() {
        return color;
    }
    public void setColor(String color) {
        this.color = color;
    }
    public int getBirthYear() {
        return birthYear;
    }
    public void setBirthYear(int birthYear) {
        this.birthYear = birthYear;
    }


}

RaceHorse.java

public class RaceHorse extends Horse {

    private int races;

    public int getRaces() {
        return races;
    }

    public void setRaces(int races) {
        this.races = races;
    }


}

DemoHorse.java

import java.util.Scanner;
public class DemoHorses {

    public static void main(String[] args) {

        Horse aHorse = new Horse();
        RaceHorse aRaceHorse = new RaceHorse();

        String DemoName;
        String DemoColor;
        String RaceDemoName;
        String RaceDemoColor;
        int DemoYear;
        int RaceDemoYear;
        int DemoRace;

        Scanner input = new Scanner(System.in); // Horse
        System.out.print("Enter the name of the horse >> ");
        DemoName = input.nextLine();
        aHorse.setColor(DemoName);
        System.out.print("Enter the color of the horse >> ");
        DemoColor = input.nextLine();
        aHorse.setColor(DemoColor);
        System.out.print("Enter the birth year of the horse >> ");
        DemoYear = input.nextInt();
        aHorse.setBirthYear(DemoYear);

        System.out.print("Enter the name of the racehorse >> "); //Racehorse
        RaceDemoName = input.nextLine();
        aRaceHorse.setName(RaceDemoName);
        System.out.print("Enter the color of the racehorse >> ");
        RaceDemoColor = input.nextLine();
        aRaceHorse.setColor(RaceDemoColor);
        System.out.print("Enter the birth year of the racehorse >> ");
        RaceDemoYear = input.nextInt();
        aRaceHorse.setBirthYear(RaceDemoYear);
        System.out.print("Enter the number of races the racehorse has completed >> ");
        DemoRace = input.nextInt();
        aRaceHorse.setRaces(DemoRace);

        System.out.println(aHorse.getName() + " is " + aHorse.getColor() + " and was born in " + aHorse.getBirthYear());
        System.out.println(aRaceHorse.getName() + " is " + aRaceHorse.getColor() + " and was born in " + aRaceHorse.getRaces());

        input.close();

    }

}

这是我得到的输出：

Enter the name of the horse >> Old Paint
Enter the color of the horse >> black
Enter the birth year of the horse >> 2005
Enter the name of the racehorse >> Enter the color of the racehorse >> black
Enter the birth year of the racehorse >> 2222
Enter the number of races the racehorse has completed >> 12
null is black and was born in 2005
 is black and was born in 12

我不知道为什么它在控制台上显示为Enter the name of the racehorse >> Enter the color of the racehorse >>，而且我认为用户输入的数据没有正确保存。有谁知道我该如何解决？

Answer 1

添加

input.nextLine();

之后

RaceDemoYear = input.nextInt();
aRaceHorse.setBirthYear(RaceDemoYear);

作业帮助-Java继承和Getters / Setters

1 个答案: