整理了一下，把多个对象保存起来，这样后期如果需要统计载人量或者载货量相关的也可以。
package com.car;
public class Car {
protected String carName; //汽车名称
protected Double rent; //租金
public Car(String carName, double rent){
this.carName = carName;
this.rent = rent;
}
public String getCarName(){
return this.carName;
}
public Double getRent(){
return this.rent;
}
}AManned
package com.car;
/**
* 载人汽车
*/
public class AManned extends Car{
protected int personCount;
public AManned(String carName, double rent, int personCount){
super(carName, rent);
this.personCount = personCount;
}
public int getPersonCount(){
return this.personCount;
}
}ATruck:
package com.car;
/**
* 货车
*/
public class ATruck extends Car{
protected int productCount;
public ATruck(String carName, double rent, int productCount){
super(carName, rent);
this.productCount = productCount;
}
public int getProductCount(){
return this.productCount;
}
}AMulti:
package com.car;
/**
* 多功能汽车
*/
public class AMulti extends Car{
protected int productCount;
protected int personCount;
public AMulti(String carName, double rent, int personCount, int productCount){
super(carName, rent);
this.productCount = productCount;
this.personCount = personCount;
}
public int getPersonCount(){
return this.personCount;
}
public int getProductCount(){
return this.productCount;
}
}index:
package com.car;
import java.util.Scanner;
public class index {
public static void main(String[] args){
//引导语
System.out.println("欢迎使用租车系统");
System.out.println("您是否要租车？1-是，0-否");
Scanner input = new Scanner(System.in);
int isRent = input.nextInt(); //是否租车
if (isRent == 1) {
System.out.println("您可租车的类型和价目表：");
System.out.println("序号 汽车名称 租金 容量");
//声明所有汽车并显示
Car[] cars = {
new AManned("奥迪",500, 4),
new AManned("马自达",400, 4),
new AMulti("皮卡雪",450, 4, 2),
new AManned("金龙",800, 20),
new ATruck("松花江", 400, 4),
new ATruck("依维柯",1000, 20)
};
for (int i = 0; i < cars.length; i++) {
int index = i+1;
if (cars[i] instanceof AManned) {
//载人
AManned car = (AManned) cars[i];
System.out.println(
index + " "+
car.getCarName()+ " "+
car.getRent()+ "元/天 "+
"载人："+ car.getPersonCount()+ "人 "
);
} else if(cars[i] instanceof ATruck) {
//载货
ATruck car = (ATruck) cars[i];
System.out.println(
index +" "+
car.getCarName()+ " " +
car.getRent()+ "元/天 " +
"载货："+ car.getProductCount()+"吨"
);
} else {
AMulti car = (AMulti) cars[i];
System.out.println(
index+ " "+
car.getCarName()+ " " +
car.getRent()+ "元/天 " +
"载人："+car.getPersonCount()+ "人 "+
"载货："+car.getProductCount()+"吨");
}
}
//选择要租的车,并记录下来
System.out.println("请选择要租车的数量：");
int carsCount = input.nextInt();
Car[] chooseCar = new Car[carsCount];
for (int j = 0; j < carsCount; j++) {
int cycle = j+1;
System.out.println("请选择第"+ cycle +"辆车：");
int carNum = input.nextInt();
chooseCar[j] = cars[carNum-1];
}
//选择租车天数，并计算出租金
System.out.println("请输入要租的天数:");
int days = input.nextInt();
double singleSum = 0;
double sum = 0;
for (Car aCar: chooseCar) {
singleSum += aCar.getRent();
}
sum = singleSum * days;
System.out.println("您的租金是："+sum);
}
}
}
