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"Real-world" Full Example of Multiple OOP Class Interaction

 1 package spartaticketingjohn;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.IOException;
 5 import java.io.InputStreamReader;
 6 
 7 /**
 8  *
 9  * @author John Rayworth
10  */
11 public class MainForTicketing {
12 
13     public static void main(String[] args) {
14         try {
15             BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
16             System.out.println("What is your name?");
17             String name = br.readLine();
18             System.out.println("How much money would you like to put in your account?");
19             int money = Integer.parseInt(br.readLine());
20             System.out.println("What year were you born? (Example 1996)");
21             int year = Integer.parseInt(br.readLine());
22             System.out.println("What month were you born? (Example 07)");
23             int month = Integer.parseInt(br.readLine());
24             System.out.println("What day were you born? (Example 22)");
25             int day = Integer.parseInt(br.readLine());
26             TicketingAccount user = new TicketingAccount(name, money, year, month, day);
27 
28             System.out.println("");
29             System.out.println("How many tickets would you like to buy - wait for 30 seconds if you want a discount...?");
30             int numTickets = Integer.parseInt(br.readLine());
31             int ticketPrice = 200;
32             user.calculateDiscount();
33             ticketPrice *= (1 - user.getDiscountedAmount());
34             int moneyToSpend = numTickets * ticketPrice;
35 
36             if (moneyToSpend > user.getAccountBalance()) {
37                 System.out.println("Sorry " + user.getName() + " you don't have enough money for this purchase.");
38                 System.out.println("You would need " + (moneyToSpend - user.getAccountBalance()) + " more crowns deposited to your account for this.");
39             } else {
40 
41                 System.out.println("For " + numTickets + " tickets you owe us " + moneyToSpend + ".");
42                 user.makePurchase(moneyToSpend);
43                 System.out.println("And after payment, " + user.getName()
44                         + " your balance will be: " + user.getAccountBalance() + ".");
45             }
46 
47         } catch (IOException ex) {
48             System.out.println("Problem in main method.");
49         }
50 
51     }
52 }
53 
54

 1 
 2 package spartaticketingjohn;
 3 
 4 import java.util.Date;
 5 import java.util.GregorianCalendar;
 6 
 7 /**
 8  *
 9  * @author John Rayworth
10  */
11 public class TicketingAccount {
12 
13     private String name = "not set yet";
14     private String userID = "not set yet";
15     private double accountBalance = 0;
16     //private boolean isDiscountedMember = false; //From the original uniform rate way of determining if discounted.
17     private double discountAmount = 0;
18     private Date birthdayDate = new Date();//Records dates in a numeric way, as one number down to the millisecond
19     private Date dateCreatedDate = new Date();
20     private int age = -999;
21 
22     public TicketingAccount() {
23     }
24 
25     public TicketingAccount(String name, double accountBalance, int year, int month, int day) {
26         this.name = name;
27         this.accountBalance = accountBalance;
28         GregorianCalendar gcForBirthday = new GregorianCalendar(year, month, day);
29         birthdayDate = gcForBirthday.getTime();
30         userID = name + "_" + birthdayDate;
31         dateCreatedDate = new GregorianCalendar().getTime();//gets current time
32         System.out.println("The current date, which will be recorded as your account creation date is: " + dateCreatedDate);
33 
34     }
35 
36     public double getDiscountedAmount() {
37         return discountAmount;
38     }
39 
40     public double getAccountBalance(){
41         return accountBalance;
42     }
43 
44     public void makePurchase(double amount){
45         accountBalance -= amount;
46     }
47 
48     public void addCredit(double amount){
49         accountBalance += amount;
50     }
51 
52     public String getName(){
53         return name;
54     }
55 
56     public void calculateDiscount() {
57 
58         //User is discounted if they are under 5 year old, over 70 years old,
59         //or if they have had this account for more than a certain time period - for this demo, 1 minute.
60 
61         //First calculate the value for the date and time right now:
62         Date nowDate = new Date();//Takes the current date and time.
63         long nowValue = nowDate.getTime();
64         //System.out.println("Now value including up to miliseconds: " + nowValue);
65 
66 
67         //They are under 5 years old if the difference between the time now and their birthday is less than 5 years' days.
68         //And they are over 70 if the difference is greater than 70 years worth of days.
69         //So first calculate the numeric value for the birthday of the user, in terms of days only:
70         long birthdayValueDays = birthdayDate.getTime() / (24 * 60 * 60 * 1000);//To bring it to just the nearest day.
71         //---->                                            hr  min  sec  millisec
72         //System.out.println("Birthday value: " + bDayValue);
73         long fiveYearsValueDays = 5 * 365;
74         long seventyYearsValueDays = 70 * 365;
75         long nowValueDays = nowValue / (24 * 60 * 60 * 1000);//Like above because Date stores values to the millisecond.
76         long numDaysDifference = nowValueDays - birthdayValueDays;
77         if (numDaysDifference < fiveYearsValueDays) {
78             System.out.println("User get's a discount since they are under 5 years old");
79             discountAmount += 0.1;
80         } else if (numDaysDifference > seventyYearsValueDays) {
81             System.out.println("User get's a discount since they are over 70 years old");
82             discountAmount += 0.15;
83         }
84 
85         //Next see how long they have been a member:
86         long dateCreatedValue = dateCreatedDate.getTime();
87         //System.out.println("Date created value: " + dateCreatedValue);
88 
89         if (nowValue - dateCreatedValue > 30000) {
90             System.out.println("User get's a discount since they have been a member for more than 30 seconds.");
91             discountAmount += 0.2;
92         }
93     }
94 }
95 
96