父类 抽象类 Car 定义了两个抽象方法

package com.dada;

public abstract class Car {
    private int num;//序号
    private String name;//车名
    private int price;//价格
    int pNum;//载入数
    private int tNum;//载货数
    public int getNum() {
        return num;
    }
    public void setNum(int num) {
        this.num = num;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getPrice() {
        return price;
    }
    public void setPrice(int price) {
        this.price = price;
    }
    public int getpNum() {
        return pNum;
    }
    public void setpNum(int pNum) {
        this.pNum = pNum;
    }
    public int gettNum() {
        return tNum;
    }
    public void settNum(int tNum) {
        this.tNum = tNum;
    }
    public abstract void run();
    public abstract void show();
}

奥迪A4类

package com.dada;

public class Aodi extends Car {

    @Override
    public void run() {
        setNum(1);
        setName("奥迪A4");
        setPrice(500);
        setpNum(4);
        settNum(0);
    }

    @Override
    public void show() {
        System.out.print(getNum() + ".t" + getName() + "t" + getPrice() + "元/天   ");
        if (getpNum() > 0)
            System.out.print(" 载人：" + getpNum() + "人");
        if (gettNum() > 0)
            System.out.print(" 载货：" + gettNum() + "吨");
        System.out.println();
    }

}

马自达6类

package com.dada;

public class Mazida extends Car{

    @Override
    public void run() {
        setNum(2);
        setName("马自达6");
        setPrice(400);
        setpNum(4);
        settNum(0);
    }

    @Override
    public void show() {
        System.out.print(getNum() + ".t" + getName() + "t" + getPrice() + "元/天   ");
        if (getpNum() > 0)
            System.out.print(" 载人：" + getpNum() + "人");
        if (gettNum() > 0)
            System.out.print(" 载货：" + gettNum() + "吨");
        System.out.println();
    }

}

皮卡雪6类

package com.dada;

public class Pika extends Car{

    @Override
    public void run() {
        setNum(3);
        setName("皮卡雪6");
        setPrice(450);
        setpNum(4);
        settNum(2);
    }

    @Override
    public void show() {
        System.out.print(getNum() + ".t" + getName() + "t" + getPrice() + "元/天   ");
        if (getpNum() > 0)
            System.out.print(" 载人：" + getpNum() + "人");
        if (gettNum() > 0)
            System.out.print(" 载货：" + gettNum() + "吨");
        System.out.println();
    }

}

金龙类

package com.dada;

public class Jinlong extends Car{

    @Override
    public void run() {
        setNum(4);
        setName("金龙");
        setPrice(800);
        setpNum(20);
        settNum(0);
    }

    @Override
    public void show() {
        System.out.print(getNum() + ".t" + getName() + "t" + getPrice() + "元/天   ");
        if (getpNum() > 0)
            System.out.print(" 载人：" + getpNum() + "人");
        if (gettNum() > 0)
            System.out.print(" 载货：" + gettNum() + "吨");
        System.out.println();
    }

}

松花江类

package com.dada;

public class Songhua extends Car{

    @Override
    public void run() {
        setNum(5);
        setName("松花江");
        setPrice(400);
        setpNum(0);
        settNum(4);
    }

    @Override
    public void show() {
        System.out.print(getNum() + ".t" + getName() + "t" + getPrice() + "元/天   ");
        if (getpNum() > 0)
            System.out.print(" 载人：" + getpNum() + "人");
        if (gettNum() > 0)
            System.out.print(" 载货：" + gettNum() + "吨");
        System.out.println();
    }

}

依维柯类

package com.dada;

public class Yiweike extends Car{

    @Override
    public void run() {
        setNum(6);
        setName("依维柯");
        setPrice(1000);
        setpNum(0);
        settNum(20);
    }

    @Override
    public void show() {
        System.out.print(getNum() + ".t" + getName() + "t" + getPrice() + "元/天 ");
        if (getpNum() > 0)
            System.out.print(" 载人：" + getpNum() + "人");
        if (gettNum() > 0)
            System.out.print(" 载货：" + gettNum() + "吨");
        System.out.println();
    }

}

开始类

package com.dada;

import java.util.Scanner;

public class Start {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        while (true) {
            System.out.println("欢迎使用答答租车系统：");
            System.out.println("您是否要租车：1是 0否");
            String s = sc.next();
            if (s.equals("1")) {
                System.out.println("您可租车的类型及其价目表：");
                System.out.println("序号t汽车名称t租金t   容量");
                Aodi c1 = new Aodi();
                Mazida c2 = new Mazida();
                Pika c3 = new Pika();
                Jinlong c4 = new Jinlong();
                Songhua c5 = new Songhua();
                Yiweike c6 = new Yiweike();
                c1.run();
                c2.run();
                c3.run();
                c4.run();
                c5.run();
                c6.run();
                c1.show();
                c2.show();
                c3.show();
                c4.show();
                c5.show();
                c6.show();
                System.out.println("请输入您要租汽车的数量：");
                int num = sc.nextInt();//租车数
                String[] name = new String[num];
                int[] price = new int[num];
                int[] pNum = new int[num];
                int[] tNum = new int[num];
                for (int i = 0; i  0)
                        if (pName.indexOf(name[i]) == -1)
                            pName = pName + name[i] + " ";
                    if (tNum[i] > 0)
                        if (tName.indexOf(name[i]) == -1)
                            tName = tName + name[i] + " ";
                }
                if (pSum > 0)
                    System.out.println("可载人的车有：" + pName + "共载人：" + pSum + "人");
                if (tSum > 0)
                    System.out.println("可载货的车有：" + tName + "共载货：" + tSum + "吨");
                System.out.println("租车总价格：" + prSum + "元");
                sc.close();
                break;
            } else if (s.equals("0")) {
                break;
            } else {
                System.out.println("输入错误！请重新输入！");
            }
        }
    }
}

源码压缩包可以在http://javatest.ys168.com下载
本人新手，欢迎各位提出意见