package com.sun; public class Car { int number; public String name; public int rent; } package com.sun; public class PassengerCar extends Car { private int peopleCapacity; public PassengerCar(){ } public PassengerCar(int number,String name,int rent,int peopleCapacity){ this.number=number; this.name=name; this.rent =rent; this.setPeopleCapacity(peopleCapacity); } public double getPeopleCapacity() { return peopleCapacity; } public void setPeopleCapacity(int peopleCapacity) { this.peopleCapacity = peopleCapacity; } } package com.sun; public class Trunk extends Car { private int cargoCapacity; public Trunk(int number,String name,int rent,int cargoCapacity){ this.number=number; this.name =name; this.rent =rent; this.setCargoCapacity(cargoCapacity); } public double getCargoCapacity() { return cargoCapacity; } public void setCargoCapacity(int cargoCapacity) { this.cargoCapacity = cargoCapacity; } } package com.sun; public class PickUp extends Car { private int peopleCapacity; private int cargoCapacity; public PickUp(int number,String name,int rent,int peopleCapacity,int cargoCapacity){ this.number=number; this.name=name; this.rent =rent; this.peopleCapacity=peopleCapacity; this.cargoCapacity=cargoCapacity; } public double getPeopleCapacity() { return peopleCapacity; } public void setPeopleCapacity(int peopleCapacity) { this.peopleCapacity = peopleCapacity; } public double getCargoCapacity() { return cargoCapacity; } public void setCargoCapacity(int cargoCapacity) { this.cargoCapacity = cargoCapacity; } } package com.sun; import java.util.*; public class Demo { @SuppressWarnings("resource") public static void main(String[] args) { // TODO Auto-generated method stub ArrayList<Car> l=new ArrayList<Car>();//载人 ArrayList<Car> l2=new ArrayList<Car>();//载货 int sum = 0; int j=0; Car[] carsForRent={new PassengerCar(1,"奥迪A4",500,4),new PassengerCar(2,"马自达6",400,4),new PickUp(3,"皮卡雪6",450,4,2),new PassengerCar(4,"金龙",800,20),new Trunk(5,"松花江",400,4),new Trunk(6,"依维柯",1000,20)}; System.out.println("欢迎使用答答租车系统\n您是否要租车:1 是 0否"); Scanner input=new Scanner(System.in); switch(input.nextInt()){ case 0: System.out.println("谢谢使用"); break; case 1: System.out.println("您可租车的类型及其价目表:\n序号\t汽车名称\t租金\t容量"); for(Car car: carsForRent){ if(car instanceof PassengerCar){ PassengerCar c=(PassengerCar) car; System.out.println(car.number+"\t"+car.name+"\t"+car.rent+"元/天\t载人:"+c.getPeopleCapacity()+"人"); } if(car instanceof PickUp){ PickUp p=(PickUp) car; System.out.println(car.number+"\t"+car.name+"\t"+car.rent+"元/天\t载人:"+p.getPeopleCapacity()+"人 载货: "+p.getCargoCapacity()+"吨"); } if(car instanceof Trunk){ Trunk t=(Trunk) car; System.out.println(car.number+"\t"+car.name+"\t"+car.rent+"元/天\t载货: "+t.getCargoCapacity()+"吨"); } } System.out.println("请输入您要租汽车的数量:"); int n=input.nextInt(); for(int i=1;i<=n;i++){ System.out.println("请输入第"+i+"辆车的序号:"); j=input.nextInt(); for(Car car: carsForRent){ if(j==car.number){ sum+=car.rent; if(j==1||j==2||j==4){ l.add(car); }else if(j==5||j==6){ l2.add(car); }else{ l.add(car); l2.add(car); } } } } System.out.println("请输入租车天数:"); int k=input.nextInt(); System.out.println("您的账单:"); System.out.println("**********可载人的车有"); int s=0; for(Car car:l){ if(car instanceof PassengerCar){ PassengerCar c1=(PassengerCar) car; s+=(int) c1.getPeopleCapacity(); if(car instanceof PickUp){ PickUp p1=(PickUp) car; s=(int) (s+p1.getPeopleCapacity()); }} System.out.print(car.name+" ");} System.out.println(" 共可载"+s+"人"); System.out.println("**********可载货的车有"); int s1=0; for(Car car:l2){ if(car instanceof Trunk){ Trunk t1=(Trunk) car; s1+=(int) t1.getCargoCapacity();} if(car instanceof PickUp){ PickUp p2=(PickUp) car; s1=(int) (s1+p2.getCargoCapacity()); } System.out.print(car.name+" "); } System.out.println(" 共可载"+s1+"吨"); System.out.println("租车总价格:"+sum*k); } } }
大神啊
for(Car car:l)这个foreach是什么意思?
没有封装吧