抽象的类方法该如何调用？

Question

想要化简一下代码，该如何实现？希望能具体点

import java.util.Scanner;

abstract class Plane {

    int jy;
    int js;
    float wy;
    int hc;
    int psg;
//    如果要用以下的构造方法，在主方法中如何调用输入？
//    public Plane(int jy, int js, float wy, int hc, int psg) {
//        super();
//        this.jy = jy;
//        this.js = js;
//        this.wy = wy;
//        this.hc = hc;
//        this.psg = psg;
//    }

    public abstract void display();
}

class Fighter extends Plane {

    
    public void display() {

        System.out.println("This is a fighter!");
    }

    private int dd;

    public void setDd(int dd) {

        this.dd = dd;
    }

    public int getDd() {

        return dd;
    }

    @Override
    public String toString() {
        return jy + " " + js + " " + wy + " " + hc + " " + psg + " " + dd;
    }

}

class Bomber extends Plane {

    public void display() {

        System.out.println("This is a bomber!");
    }

    private int zd;

    public void setZd(int zd) {

        this.zd = zd;
    }

    public int getZd() {

        return zd;
    }

    public String toString() {

        return jy + " " + js + " " + wy + " " + hc + " " + psg + " " + zd;
    }
}

public class oj1417 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc = new Scanner(System.in);
        Fighter fit = new Fighter();
        Bomber bmb = new Bomber();
        while (sc.hasNext()) {

            char c = sc.next().charAt(0);
            if (c == 'f') {

//                fit.jy = sc.nextInt();
//                fit.js = sc.nextInt();
//                fit.wy = sc.nextFloat();
//                fit.hc = sc.nextInt();
//                fit.psg = sc.nextInt();
//                fit.setDd(sc.nextInt());
//               想要省去上面繁琐的fit.对象，下面的形式该如何实现？
                Plane p2 = new Fighter();
                p2.Plane(sc.nextInt(),sc.nextInt(),sc.nextFloat(),sc.nextInt(),sc.nextInt());
                fit.display();
                System.out.println(fit);
            }
            if (c == 'b') {

                bmb.jy = sc.nextInt();
                bmb.js = sc.nextInt();
                bmb.wy = sc.nextFloat();
                bmb.hc = sc.nextInt();
                bmb.psg = sc.nextInt();
                bmb.setZd(sc.nextInt());
                bmb.display();
                System.out.println(bmb);

            }
        }
        sc.next();
    }
}

Answer 1

• 子类 要 有对应的构造方法，并在子类的构造方法中 调用 super 先初始化父类【即调用父类的构造方法】
• 参考如下：

import java.util.Scanner;

abstract class Plane {
    int jy;
    int js;
    float wy;
    int hc;
    int psg;

    public Plane(int jy, int js, float wy, int hc, int psg) {
        this.jy = jy;
        this.js = js;
        this.wy = wy;
        this.hc = hc;
        this.psg = psg;
    }

    public abstract void display();
}

class Fighter extends Plane {


    public Fighter(int jy, int js, float wy, int hc, int psg) {
        super(jy, js, wy, hc, psg);
    }

    public void display() {

        System.out.println("This is a fighter!");
    }

    private int dd;

    public void setDd(int dd) {

        this.dd = dd;
    }

    public int getDd() {

        return dd;
    }

    @Override
    public String toString() {
        return jy + " " + js + " " + wy + " " + hc + " " + psg + " " + dd;
    }

}

class Bomber extends Plane {

    public Bomber(int jy, int js, float wy, int hc, int psg) {
        super(jy, js, wy, hc, psg);
    }

    public void display() {

        System.out.println("This is a bomber!");
    }

    private int zd;

    public void setZd(int zd) {

        this.zd = zd;
    }

    public int getZd() {

        return zd;
    }

    public String toString() {

        return jy + " " + js + " " + wy + " " + hc + " " + psg + " " + zd;
    }
}

public class oj1417 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            char c = sc.next().charAt(0);
            if (c == 'f') {
                Plane fighter = new Fighter(sc.nextInt(), sc.nextInt(), sc.nextFloat(), sc.nextInt(), sc.nextInt());
                fighter.display();
                System.out.println(fighter);
            }
            if (c == 'b') {
                Plane fighter = new Bomber(sc.nextInt(), sc.nextInt(), sc.nextFloat(), sc.nextInt(), sc.nextInt());
                fighter.display();
                System.out.println(fighter);
            }
        }
        sc.next();
    }
}