java练习2：
java实现模拟借书系统：
可实现：
（基本功能）
1.展示可租车辆
2.选择车型、租车量
3.展示租车清单，包含：总金额、总载货量及其车型、总载人量及其车型
（异常处理）
1.输入类型错误，输出“are you kidding me?”，提示重新输入
2.超过车辆库的范围，输出“序号超出范围”，提示重新输入
3.对于不符合常识的数量和日期，输出“请输入大于或等于1的整数！”，提示重新输入
界面：
图片1.png
public class Car {
private int seq;
private String name;
private int money;
public int getSeq() {
return seq;
}
public void setSeq(int seq) {
this.seq = seq;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getMoney() {
return money;
}
public void setMoney(int money) {
this.money = money;
}
}
public class RenCar extends Car {
private int people;
public RenCar(int seq,String name,int money,int people) {
this.setSeq(seq);
this.setName(name);
this.setMoney(money);
this.people=people;
}
public int getPeople() {
return people;
}
public void setPeople(int people) {
this.people = people;
}
}
public class picar extends Car {
private int people;
private int thing;
public picar(int seq,String name,int money,int people,int thing) {
this.setSeq(seq);
this.setName(name);
this.setMoney(money);
this.people=people;
this.thing=thing;
}
public int getPeople() {
return people;
}
public void setPeople(int people) {
this.people = people;
}
public int getThing() {
return thing;
}
public void setThing(int thing) {
this.thing = thing;
}
}
public class Trunk extends Car {
private int thing;
public Trunk(int seq,String name,int money,int thing) {
this.setSeq(seq);
this.setName(name);
this.setMoney(money);
this.thing=thing;
}
public int getThing() {
return thing;
}
public void setThing(int thing) {
this.thing = thing;
}
}
import java.util.Scanner;
public class Initail {
private static Scanner sc=new Scanner(System.in);
public static void main(String[] args) {
// TODO Auto-generated method stub
//车辆信息
Car[] cars= {new RenCar(1,"奥迪A4",500,4),new RenCar(2,"马自达6",400,4),new picar(3,"皮卡雪6",450,4,2),new RenCar(4,"金龙",800,20),new Trunk(5,"松花江",400,4),new Trunk(6,"依维柯",1000,20)};
System.out.println("******欢迎使用哒哒租车系统：");
System.out.println("*****您是否要租车：1是 0否；");
while(true) {
int a1=selectNum();
switch(a1) {
case 1://租车
// 租车表显示
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(元)"+"\t载人(人)"+"\t载货(吨)");
for(Car car:cars) {
if(car instanceof RenCar) {
System.out.println(car.getSeq()+"\t"+car.getName()+"\t"
+car.getMoney()+"\t"+((RenCar) car).getPeople());
}else if(car instanceof picar) {
System.out.println(car.getSeq()+"\t"+car.getName()+"\t"
+car.getMoney()+"\t"+((picar) car).getPeople()+"\t"+((picar) car).getThing());
}else {
System.out.println(car.getSeq()+"\t"+car.getName()+"\t"
+car.getMoney()+"\t"+"\t"+((Trunk) car).getThing());
}
}
//开始租车
System.out.println("****请输入您要租汽车的数量：");
int a2=selectDateOrNumber();
int[] seq=new int[a2];
for(int i=0;i<a2;i++) {
System.out.println("****请输入第"+(i+1)+"辆车的序号：");
seq[i]=selectSeq(cars)-1;
}
System.out.println("****请输入租车天数：");
int date=selectDateOrNumber();
System.out.println("****您的账单：");
System.out.println("*****可载人的车有：");
int price=0;
int zairen=0;
int zaihuo=0;
for(int j=0;j<a2;j++) {
if(cars[seq[j]] instanceof RenCar) {
System.out.print(cars[seq[j]].getName()+" ");
zairen+=((RenCar) cars[seq[j]]).getPeople();
}
if(cars[seq[j]] instanceof picar) {
System.out.print(cars[j].getName()+" ");
zairen+=((picar) cars[seq[j]]).getPeople();
}
price+=cars[seq[j]].getMoney()*date;
}
System.out.println("共载人："+zairen+"人");
System.out.println("*****可载货的车有：");
for(int k=0;k<a2;k++) {
if(cars[seq[k]] instanceof Trunk) {
System.out.print(cars[seq[k]].getName()+" ");
zaihuo+=((Trunk) cars[seq[k]]).getThing();
}
if(cars[seq[k]] instanceof picar) {
System.out.print(cars[seq[k]].getName()+" ");
zaihuo+=((picar) cars[seq[k]]).getThing();
}
}
System.out.println("共载货："+zaihuo+"吨");
System.out.println("*****租车总金额："+price+"元");
System.out.println("期待您下次使用！");
break;
case 0:
//不租车
System.out.println("祝您生活愉快！");
break;
case -1:
//输入了字符串或小数
System.out.println("Are you kidding me???!");
continue;
default:
//输入其他数字均为错误
System.out.println("？？请输入正确的选择！");
continue;
}
break;
}
}
//数字型输入
public static int selectNum() {
int number;
try {
number=sc.nextInt();
} catch (Exception e) {
// 输入字符型的异常
sc=new Scanner(System.in);
number=-1;
}
return number;
}
// 日期和租车数量的处理
public static int selectDateOrNumber() {
while(true) {
int date=selectNum();
if(date<1) {
System.out.print("请输入大于或等于1的整数！");
continue;
}
return date;
}
}
//租车序号处理
public static int selectSeq(Car[] cars){
while(true) {
int seq=selectDateOrNumber();
if(seq>cars.length) {
System.out.print("序号超出范围！");
continue;
}
int number=cars[seq-1].getSeq();
return number;
}
}
}
