我有一个名为＆＃34;游乐园编程项目＆＃34;
的学校项目它需要创建四个类：
AmusementPark类是我需要帮助的地方 - 我了解需要按照说明进行操作但我不清楚如何访问在Ticket和Merchandise中定义的getter / setter方法和ArrayLists以使事情发生 - 我正在阅读指导，观看视频但无法使其发挥作用？：
我已经粘贴了我的代码（例如它） - 任何指导都表示赞赏不寻找要编写的实际代码 - 只是为了清除我的困惑。提前谢谢。
---------------- TICKET CLASS ----------------------------- -----
import java.util.*;
public class Ticket {
//Ticket Class models admission tickets
//Instance Variables called for in the instructions
private long number;
private String category;
private String holder;
private Date date;
private double price;
private boolean purchased;
// Constructor Ticket -- The instructions did not call for instance field "number" as a parameter and left "purchased" out of the UML???
public Ticket (long number, String category, String holder, Date date, double price, boolean purchased){
this.number = number; //Stores unique ticket ID Number
this.category = category; //Stores adult, child, or senior
this.holder = holder; //Stores name of purchaser
this.date = date; //Stores admission date for the ticket
this.price = price; //Stores price of the ticket
this.purchased = purchased; //Stores true if purchased, false if reserved
} // End Brace Constructor Ticket
// MUTATOR METHODS..............................................
// setPrice Mutator Method
public void setPrice(double price){
this.price = price;
} // End Brace setPrice
//changePurchaseStatus Mutator Method
public void setchangePurchaseStatus(boolean newStatus){
this.purchased = newStatus;
} // End Brace changePurchasedStatus
// ACCESSOR METHODS.............................................
//getnumber Accessor Method
public long getnumber(){
return number;
}
//getcategory Accessor Method
public String getcategory(){
return category;
}
//getholder Accessor Method
public String getholder(){
return holder;
}
//getdate Accessor Method
public Date getdate(){
return date;
}
//getprice Accessor Method
public double getprice(){
return price;
}
//getpurchased Accessor Method
public boolean getpurchased(){
return purchased;
}
} // End Brace Ticket Class
--------------------------MERCHANDISE CLASS------------------------------
public class Merchandise {
//Instance Variables called for in the instructions
private long ID; //ID of specific merchandise item
private String category; //Stores type of item (T-Shirt, Sweatshirt, Stuffed Animal) - if invalid display "Unknown"
private String description; //Stores description of item
private double price; //Stores price of item
private boolean instock; //True = in stock False = on order
// Constructor Merchandise
public Merchandise(long ID, String category, String description, double price, boolean instock){
this.ID = ID;
this.category = category;
this.description = description;
this.price = price;
this.instock = instock;
} // End Brace Constructor Merchandise
// MUTATOR METHODS..............................................
public void setPrice(double price){
this.price = price;
}
public void setInstock(boolean newStatus){
this.instock = newStatus;
}
// ACCESSOR METHODS.............................................
public long getID(){
return ID;
}
public String getcategory(){
return category;
}
public String getdescription(){
return description;
}
public double getprice(){
return price;
}
public boolean getinstock(){
return instock;
}
// toString Method.............................................
@Override
public String toString(){
return("Merchandise ID:" + "\t" + this.ID + "\n" + "Merchandise Category:" + "\t" + this.category + "\n"
+ "\t" + "Merchandise Description:" + "\t" + this.description + "$" + this.price + "\t"
+ "In-Stock Status" + "\t" + this.instock);
}
} //End Brace Merchandise Class
------------------------AMUSEMENT PARK CLASS---------Where I Need Help!!--------
import java.util.ArrayList;
import java.util.Date;
public class AmusementPark {
//Instance Variables called for in the instructions
private String name = "Walden Gift Shop"; // Assigned a value that I think is needed to support "getName" Accessor Method
private Date date; // Not called for in the instruction but I believe it is needed
//ArrayLists
public static ArrayList<Ticket> tickets = new ArrayList<Ticket>(); //Stores ticket objects
public static ArrayList<Merchandise> merchandise = new ArrayList<Merchandise>(); //Stores Merchandise objects
// Stores ArrayList of type Date called "ticketDate" that has all dates for which tickets are still available
// This ArrayList was not clearly called for in the instructions but is required to return dates for which tickets are still available -
// if no tickets are available return empty list
/** public ArrayList<Date> ticketDate(){
ArrayList<Date> ticketDate = new ArrayList<Date>();
Date.(2014, 03, 01);
} */
// Constructor AmusementPark
public AmusementPark(String name){ //How should I be referencing / using the ArrayLists tickets & merchandise in the constructor??????
this.name = name;
}
// ACCESSOR METHODS.............................................
public String getName(){ // Returns the name of the amusement park shop
return name;
}
//--------------------- Have 3 getters to return various Ticket data - Need to fix the stubs for them shown below----------------------
// Need to fix this getTicketDates getter
/** public getTicketDates(){ //Returns an ArrayList<Date> of all dates tickets are still available
return
} */
// Need to fix this getTickets getter
/** public Date getTickets(){ // Returns an integer indicating number of tickets available for specified date
return date;
} */
// Need to fix this getTicket getter
/** public long getTicket (long id){ //Returns Ticket number / ID that matches the specified ticket
Ticket myTicketID = new Ticket();
id.getnumber();
}*/
//---------------------------END the 3 "getMerchandise" getters----------------------------------------------------------------------
//--------------------- Have 3 "getMerchandise" getters to define - Need to fix the stubs for them shown below----------------------
// Need to fix this getMerchandise getter
/** public getMerchandise(){ //Returns an Arraylist<Merchandise> of all inventory - if no match return empty list
return ;
} */
//Need to fix this getMerchandise getter
/** public getMerchandise (String category){ //Returns a list of Merchandise objects whose category matches the specified (e.g., T-Shirts), no match return empty list
return
}*/
//Need to fix this getMerchandise getter
/** public getMerchandise (long id){ //Returns the merchandise item that matches the specified id number, if not match return null
return
}*/
//---------------------------END the 3 "getMerchandise" getters----------------------------------------------------------------------
//Need to fix this addTicket Mutator method
/** public addTicket (Ticket) { // Adds a new Ticket to the inventory of AmusementPark Class
} */
//Need to fix this buyMerchandise Mutator method
/** public buyMerchandise (String id){ //Removes a Merchandise object from teh list of merchandise of the AmusementPark Class, if no match throw exception
} */
//Need to fix this buyTicket Mutator method
/** public buyMerchandise (String id){ //Removes a Ticket object from the list of ticket items of the AmusementPark Class - If not match throw exception
} */
} // End Brace AmusementPark Class
答案 0 :(得分：1)
您需要在需要的地方实例化Ticket对象。
Ticket yourTickecObject = new Ticket(constructor parameters);
然后只需调用getter获取数据
int price = yourTicketObject.getPrice();
并设置设置数据
yourTicketObject.setPrice(someValue);
对于ArrayList，票证声明：
ArrayList<someTipe> yourArrayListName = new ArrayList<someTipe>();
吸气剂：
完整数组列表：
public ArrayList getYourArrayListName(){
return this.yourArrayListName;
}
具体项目：
public yourArrayListType getItem(index){
return this.yourArrayListName.get(index)
}
设定器：
如果您想添加一个项目：
public void addObjectToYourArrayListName(SomeValidType argument){
this.yourArrayListName.add(argument);
}
如果要设置ArrayList：
public void setYourArrayListName(ArrayList<someValidType> argument){
this.yourArrayListName = argument;
}
要访问数组列表：
设定器：
添加项目：
yourTicketObject.addObjectToYourArrayListName(SomeValidType argument)
添加完整的ArrayList：
yourTicketObject.setYourArrayListName(ArrayList<someValidType>)
吸气剂：
获取完整数组列表：
Arraylist<someType> someName = yourTicketObject.getYourArrayListName()
获取具体索引：
YourArrayListType variableName = yourTicketObject.getItem(index)
所有这些代码都是抽象的，您可以在每个适应的地方使用它，注意变量的类型。
希望这有帮助