四個(gè)定義類：

package?com.imooc;
//Truck類
public?class?Truck?extends?Car?{
????private?int?goods;
????public?Truck(String?name,?int?price,?int?goods){
????????this.name=name;
????????this.price=price;
????????this.goods=goods;
????}
????public?int?getGoods(){
????????return?goods;
????}
????public?void?setGoods(int?goods){
????????this.goods=goods;
????}
}
//皮卡類
package?com.imooc;

public?class?Pickup?extends?Car?{
????private?int?men;
????private?int?goods;
????public?Pickup(String?name,int?price,int?men,int?goods){
????????this.name=name;
????????this.price=price;
????????this.men=men;
????????this.goods=goods;
????}
????public?int?getMen()?{
????????return?men;
????}
????public?void?setMen(int?men)?{
????????this.men?=?men;
????}
????public?int?getGoods()?{
????????return?goods;
????}
????public?void?setGoods(int?goods)?{
????????this.goods?=?goods;
????}
????
}
//載人類
package?com.imooc;

public?class?Man_pick?extends?Car?{
????private?int?men;
????public?Man_pick(String?name,int?price,int?men){
????????this.name=name;
????????this.price=price;
????????this.men=men;
????}
????public?Man_pick(){
????????
????}
????public?int?getMen()?{
????????return?men;
????}
????public?void?setMen(int?men)?{
????????this.men?=?men;
????}
}
//大類：Car類
package?com.imooc;

public??class?Car?{
????public?int?price;
????public?String?name;
????public?int?getPrice()?{
????????return?price;
????}
????public?void?setPrice(int?price)?{
????????this.price?=?price;
????}
????public?String?getName()?{
????????return?name;
????}
????public?void?setName(String?name)?{
????????this.name?=?name;
????}
????
}
//主函數(shù)：?Carsystem
package?com.imooc;
import?java.util.*;
public?class?Carsystem?{

????/**
?????*?@param?args
?????*/
????public?static?void?main(String[]?args)?{
????????//?TODO?Auto-generated?method?stub
????????Car[]?cars=?{new?Man_pick("奧迪A4",500,4),new?Man_pick("馬自達(dá)6",400,4),new?Pickup("皮卡雪6",450,4,2),
????????????????new?Man_pick("金龍",800,20),new?Truck("松花江",400,4),new?Truck("依維柯",1000,20)};
????????System.out.println("歡迎使用答答租車系統(tǒng)");
????????System.out.println("您是否要租車？1是?0否");
????????Scanner?sc=?new?Scanner(System.in);
????????int?sel=sc.nextInt();
????????if(sel==0)?System.exit(0);
????????else?if(sel?==?1){
????????????System.out.println("您可租車的類型及其價(jià)目表：");
????????????System.out.println("序號(hào)\t汽車名稱\t租金\t\t容量");
????????????int?i=1;
????????????for(Car?car?:?cars){
????????????????if(car?instanceof?Man_pick?)
????????????????{
????????????????????Man_pick?mtemp?=(Man_pick)?car;
????????????????????System.out.println(i+".\t"+mtemp.getName()+"\t"+mtemp.getPrice()+"元/天\t\t載人："+mtemp.getMen()+"人");
????????????????}
????????????????????
????????????????else?if(car?instanceof?Truck?)
????????????????{
????????????????????Truck?mtemp?=?(Truck)car;
????????????????????System.out.println(i+".\t"+mtemp.getName()+"\t"+mtemp.getPrice()+"元/天\t\t載貨："+mtemp.getGoods()+"噸");
????????????????}
????????????????????
????????????????else?if(car?instanceof?Pickup?)
????????????????{
????????????????????Pickup?mtemp=?(Pickup)car;
????????????????????System.out.println(i+".\t"+mtemp.getName()+"\t"+mtemp.getPrice()+"元/天\t\t載人："+mtemp.getMen()+"人,"
????????????????????????????+"載貨："+mtemp.getGoods()+"噸");
????????????????}
????????????????i++;
????????????}
????????????System.out.println("請(qǐng)輸入您要租車的數(shù)量：");
????????????int?sum=sc.nextInt();
????????????int?b[]=new?int[sum];
????????????for(int?j=0;j<sum;j++){
????????????????System.out.println("請(qǐng)輸入第"+(j+1)+"輛車的序號(hào)：");
????????????????b[j]=sc.nextInt();
????????????}
????????????System.out.println("請(qǐng)輸入租車天數(shù)：");
????????????int?days=sc.nextInt();
????????????System.out.println("您的賬單：");
????????????System.out.println("***可載人的車有：");
????????????int?ren?=?0;
????????????for(int?j=0;j<b.length;j++){
????????????????//System.out.println(cars[b[j]-1].name);????
????????????????if(cars[b[j]-1]?instanceof?Man_pick||?cars[b[j]-1]?instanceof?Pickup?){
????????????????????//System.out.println(ren+"");
????????????????????System.out.print(cars[b[j]-1].name+"?");
????????????????????if(cars[b[j]-1]?instanceof?Man_pick){
????????????????????????Man_pick?mtemp?=(Man_pick)?cars[b[j]-1];
????????????????????????ren+=mtemp.getMen();
????????????????????}
????????????????????else{
????????????????????????Pickup?mtemp=?(Pickup)cars[b[j]-1];
????????????????????????ren+=mtemp.getMen();
????????????????????}
????????????????}
????????????????
????????????????????
????????????}
????????????System.out.println("??共載人："+ren+"人");
????????????System.out.println("***可載貨的車有：");
????????????int?goods=0,all=0;
????????????for(int?j=0;j<b.length;j++){
????????????????all+=cars[b[j]-1].getPrice();
????????????????if(cars[b[j]-1]?instanceof?Truck||?cars[b[j]-1]?instanceof?Pickup?){
????????????????????//System.out.println(ren+"");
????????????????????System.out.print(cars[b[j]-1].name+"?");
????????????????????if(cars[b[j]-1]?instanceof?Truck){
????????????????????????Truck?mtemp?=(Truck)?cars[b[j]-1];
????????????????????????goods+=mtemp.getGoods();
????????????????????}
????????????????????else{
????????????????????????Pickup?mtemp=?(Pickup)cars[b[j]-1];
????????????????????????goods+=mtemp.getGoods();
????????????????????}
????????????????}
????????????????
????????????????????
????????????}
????????????System.out.println("??共載貨："+goods+"噸");
????????????System.out.println("***租車總價(jià)格："+all*days+"元");
????????}
????????else?{
????????????System.out.println("輸入有誤，程序退出！");
????????????System.exit(0);
????????}
????????
????}

}