写完了，对老师讲的面向对象的三个特性确实有了更深的理解，贴上代码，请大神指点
package prj6;
public class InputInvalidException extends Exception {
private int max;
public InputInvalidException(int max){
this.max = max;
}
public String toString(){
return "Invalid input, please try again(1-"+ max+")";
}
}
package prj6;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
int isRent; //value for using the system or not
RenVehi renv=new RenVehi();
renv.welMsg(); //print welcome message
Scanner input=new Scanner(System.in);
System.out.println("Are you going to use the XXX rental system? ");
isRent=input.nextInt();
if (isRent==1){
int i=1;
renv.disHead(); //print title
Vehicle[] vehi = {new PasVehi("奥迪A4",500,4), new PasVehi("马自达6",400,4), new PasCargoVehi("皮卡雪6",450,4,2), new PasVehi("金龙",800,20),new CargoVehi("松花江",400,4),new CargoVehi("依维柯",1000,20)};//initial assignment
for (Vehicle v:vehi){ //traversal all the elements in the object and then print
System.out.print(i+"\t");
v.displayCarList();
i++;
}
int vID[]= renv.getVehicleID(vehi.length); //get all the choices number of customer
int days=renv.getDays(); // get the days when customer want to rent
renv.displayBill(vehi, vID, days); //print bill
}else{
renv.disQuit(); //quit the system
}
}
}
package prj6;
public class Vehicle { //the class has 4 attributes
//private int type;
private String name;
private Double rental;
private int passenger;
private int cargo;
public String getName(){
return(name);
}
public Double getRental(){
return(rental);
}
public int getPassenger(){
return(passenger);
}
public int getCargo(){
return(cargo);
}
public Vehicle(String name, Double rental,int passenger,int cargo){ //constructor, get all 4 attribes
this.name=name;
this.rental=rental;
this.passenger = passenger;
this.cargo = cargo;
}
public void displayCarList(){ //print all available choice for customers
if (cargo==0){ //if coach, print name, rent, and capacity of passenger
System.out.println(name+"\t$"+rental+" /day\t"+"load passenger\t"+passenger);
}else if(passenger==0){ //if truck, print name, rent, and capacity of cargo
System.out.println(name+"\t$"+rental+" /day\t"+"load cargo\t"+cargo);
}else{ //if pickup, print name, rent, and capacity both of passenger and cargo
System.out.println(name+"\t$"+rental+" /day\tload passenger "+passenger+" load cargo "+cargo+"T");
}
}
}
package prj6;
public class PasVehi extends Vehicle { //coach class
public PasVehi(String name, double rental, int passenger ){
super(name, rental, passenger,0); //call father consturctor with 0 cargo
}
}
package prj6;
public class CargoVehi extends Vehicle { //truck class
public CargoVehi(String name,double rental,int cargo){
super(name,rental,0,cargo); //call the father constructor with 0 passenger
}
}
package prj6;
public class PasCargoVehi extends Vehicle { //pickup class
public PasCargoVehi(String name,double rental,int passenger,int cargo){
super(name, rental,passenger,cargo); //call father constructor
}
}
package prj6;
import java.util.Scanner;
public class RenVehi{
//boolean renFlag;
public void welMsg(){ //print welcome message
System.out.println("Welcome to XXX rental system!");
System.out.println();
}
public void disHead(){ //print the titles for both system and vehicles
System.out.println("Price list of XXX rental system");
System.out.println("Number\t"+"Model\t"+"Price\t\t"+"Capacity");
}
public void disQuit(){ //print quit message
System.out.println("You already quit the XXX rental system");
}
public int[] getVehicleID(int totalNum){ //get the array of ID for those selected vehicles
Scanner input = new Scanner(System.in);
//int numVehi;
System.out.println("How many vehicles are you going to rent?(1-"+totalNum+")");
int numVehi=input.nextInt();//the number should between 1 and the value of all availble vehicle
boolean inputFlag = false;
do {
try{
checkInput(numVehi,totalNum);
inputFlag = true;
}catch (InputInvalidException e){
System.out.println(e);
numVehi=input.nextInt();
}
}while (inputFlag==false);
int ID[] = new int[numVehi];
inputFlag = false;
for (int j=0;j<numVehi;j++){
System.out.println("Please input the vehicle's ID(1-"+totalNum+")");
ID[j]=input.nextInt();
do{
try{
checkInput(ID[j],totalNum);
inputFlag = true;
}catch (InputInvalidException e){
System.out.println(e);
ID[j]=input.nextInt();
}
}while (inputFlag==false);
}
return ID;
}
public void checkInput(int id, int max) throws InputInvalidException{
if ((id>max) || (id<1)){
throw new InputInvalidException(max);
}
}
public int getDays(){ //get the days that customer want to rent
Scanner input = new Scanner(System.in);
int days;
System.out.println("Please input the days(>0):");
days = input.nextInt();
while (days<1){ //days should be positive number
System.out.println("Invalid days, please try again");
System.out.println("Please input the days(>0):");
days=input.nextInt();
}
return(days);
}
public void displayBill(Vehicle[] v, int[] id, int days){ //print all the names and capacity of selected vehicles, and calculated the total rent
double totalAmount=0; //total rent
int totalPassenger=0, totalCargo=0; //total capacity for passenger and cargo
String vPasName[]=new String[id.length]; //store all the names of selected coach
String vCargoName[]=new String[id.length]; //store all the names of selected truck
int j;
int passNum=0,cargoNum=0; //the number of selected coach, and truck respectively
for (int i=0;i<id.length;i++){
j = id[i]-1; //the subscript of vehicle array should be the printed number showing on the menu minus 1
totalAmount = totalAmount+v[j].getRental()*days; //get the total rent
if (v[j] instanceof PasVehi){ //for coach, dealing with the coach way: put name in the coach name array, total number of passengers, counter++
//String h = v[j].getName();
vPasName[passNum]=v[j].getName();
totalPassenger+=v[j].getPassenger();
passNum++;
//flag[i]=1;
}else if (v[j] instanceof CargoVehi){ //for truck, dealing with the truck way: put name in the truck name array, total capacity, counter++
vCargoName[cargoNum]=v[j].getName();
totalCargo+=v[j].getCargo();
cargoNum++;
}else if (v[j] instanceof PasCargoVehi) { //for pickup, dealing with both ways: put name both in truck name array and coach name array,
vPasName[passNum]=v[j].getName();
vCargoName[cargoNum]=v[j].getName();
totalPassenger+=v[j].getPassenger();
totalCargo+=v[j].getCargo();
passNum++;
cargoNum++;
}
}
if (passNum>=1){ //if there's more than one coach in costomer's choice, print all the vehicles and total capacity
this.displayVehicle(vPasName, 1, totalPassenger, passNum);
}else{
System.out.println("You didn't choose any vehicle for passenger");//if no coach, print result
}
if (cargoNum>=1){ //if there's more than one truck in costomer's choice, print all the vehicles and total capacity
this.displayVehicle(vCargoName, 0, totalCargo, cargoNum);
}else{
System.out.println("You didn't choose any vehicle for cargo"); //if no truck, print the result
}
System.out.println("You have to pay $"+totalAmount);//print the total rent
}
public void displayVehicle(String[] vName, int flag, int total, int num){//print all the names of selected vehicle and the total capacity
if (flag==1){
System.out.println("the Vehicles for loading passengers are: ");
}else {
System.out.println("the Vehicles for loading cargo are: ");
}
for (int i=0;i<num;i++){
System.out.print(vName[i]+"\t");
}
if (flag==1){
System.out.println("the total number of loading passenger is "+total);
}else {
System.out.println("the total number of loading cargo is "+total+"T");
}
}
}
