CS2030 Lab 2-Cruise Loaders Solution

Topic Coverage
Inheritance
Polymorphism
Method overriding
String formatting
Problem Description
Normal Cruise:
Takes 30min for a loader to fully load
Requires only one loader
Big Cruise (with a cruise code that starts with 'B'):
Takes 60min for loaders to fully load
Requires two loaders
Furthermore, as the Cruise Centre wants to go green, their policy states that every third loader purchased must be a loader made from recycled materials (referred to as a recycled loader), which undergoes maintenance for one hour after each service. The recycled loader is unable to serve a cruise during the maintenance period.
For each cruise, check through the inventory of loaders, starting from the loader first purchased and so on.
The first (or first two) loaders available will be used to serve the cruise.
If there are not enough loaders, purchase a new one(s), and that loader(s) will be used to serve the cruise. Every third loader purchased must be a recycled loader.
Task
The program will output
The number of cruises
The number of big cruises
The number of loaders required
The number of recycled loaders required
Take note of the following assumptions:
Input cruises are presented chronologically by arrival time
There can be up to 30 cruises in one day
There are no duplicate cruises in the input
Although the solution to this problem can be implemented procedurally, you should learnt to model the solution using an object-oriented approach instead.


Level 1
Represent a Cruise
The following is a sample run of the program. User input is underlined.
$ java Main
1
A1234 0
A1234@0000
$ java Main
6

Check the format correctness of the output by typing the following Unix command
$ java Main < test.in | diff - test1.out
Make a copy of your Java programs to the level directory by typing the Unix commands
$ jar cvf cruise1.jar *.java
$ mkdir cruise1
$ cp *.java cruise1
$ cp cruise1.jar cruise1



Level 2
Ensure that each line denoting the cruise served is prefixed with four spaces.
In this level, all cruises (even those with codes that begin with 'B') will be taken as a normal cruise.
The Cruise Centre's go-green policy has not been in place as of yet. All loaders purchased are not recycled.
The following is a sample run of the program. User input is underlined.
$ java Main
1
A1234 0
Loader 1 serves:
A1234@0000

Loader 1 serves:
A1111@0900
B1113@0940
B1115@1030
D1115@1130 Loader 2 serves: B1112@0901
C2030@1000
Check the format correctness of the output by typing the following Unix command
$ java Main < test.in | diff - test2.out
Make a copy of your Java programs to the level directory by typing the Unix commands
$ jar cvf cruise2.jar *.java
$ mkdir cruise2
$ cp *.java cruise2
$ cp cruise2.jar cruise2



Level 3
Serve Big Cruises
Big cruises require two loaders and 60 minutes to serve.
The following is a sample run of the program. User input is underlined.
$ java Main
1
B1111 0
Loader 1 serves:
B1111@0000 Loader 2 serves:
B1111@0000

Loader 1 serves:
A1111@0900
B1113@0940
D1115@1130 Loader 2 serves:
B1112@0901
B1115@1030 Loader 3 serves:
B1112@0901
B1115@1030 Loader 4 serves:
B1113@0940 Loader 5 serves:
C2030@1000
Check the format correctness of the output by typing the following Unix command
$ java Main < test.in | diff - test3.out
Make a copy of your Java programs to the level directory by typing the Unix commands
$ jar cvf cruise3.jar *.java
$ mkdir cruise3
$ cp *.java cruise3
$ cp cruise3.jar cruise3


Level 4
Purchase recycled loaders
Note that every third loader purchased must be recycled, and recycled loaders require 60 minutes of maintenance after each cruise served.
The following is a sample run of the program. User input is underlined.



$ java Main
4
Loader 1 serves:
A1111@1300
C1113@1359 Loader 2 serves:
B1112@1300
B1114@1400 Loader 4 serves:
B1114@1400
Loader 3 (recycled) serves: B1112@1300

Loader 1 serves:
A1111@0900
B1113@0940
D1115@1130 Loader 2 serves:
B1112@0901
B1115@1030 Loader 4 serves:
B1113@0940 Loader 5 serves:
C2030@1000
B1115@1030
Loader 3 (recycled) serves: B1112@0901

Loader 1 serves:
A1234@0000
C1238@0030
X1241@0100
B1242@0200
B1243@0300 Loader 2 serves:
B1235@0001
B1242@0200
B1243@0300 Loader 4 serves:
B1236@0002 Loader 5 serves:
B1236@0002 Loader 7 serves:
B1237@0003 Loader 8 serves:
V1239@0031 Loader 10 serves:
B1240@0032
Loader 3 (recycled) serves:
B1235@0001
Loader 6 (recycled) serves:
B1237@0003
Loader 9 (recycled) serves: B1240@0032
Check the format correctness of the output by typing the following Unix command
$ java Main < test.in | diff - test4.out



$ java Main
4
A1111 1300
B1112 1300
C1113 1359
B1114 1400
+==================================+
| Cruise Statistics |
+----------------------------------+
| Number of normal cruises = 2 |
| Number of big cruises = 2 |
+==================================+
| Equipment statistics |
+----------------------------------+
| Number of loaders = 3 |
| Number of recycled loaders = 1 |
+==================================+
| Loader 1 serves: |
| A1111@1300 |
| C1113@1359 |
+==================================+
| Loader 2 serves: |
| B1112@1300 |
| B1114@1400 |
+==================================+
| Loader 4 serves: |
| B1114@1400 |
+==================================+
| Loader 3 (recycled) serves: |
| B1112@1300 |
+==================================+







$ java Main
6
A1111 0900
B1112 0901
B1113 0940
C2030 1000
B1115 1030
D1115 1130
+==================================+
| Cruise Statistics |
+----------------------------------+
| Number of normal cruises = 3 |
| Number of big cruises = 3 |
+==================================+
| Equipment statistics |
+----------------------------------+
| Number of loaders = 4 |
| Number of recycled loaders = 1 |
+==================================+
| Loader 1 serves: |
| A1111@0900 |
| B1113@0940 |
| D1115@1130 |
+==================================+
| Loader 2 serves: |
| B1112@0901 |
| B1115@1030 |
+==================================+
| Loader 4 serves: |
| B1113@0940 |
+==================================+
| Loader 5 serves: |
| C2030@1000 |
| B1115@1030 |
+==================================+
| Loader 3 (recycled) serves: |
| B1112@0901 |
+==================================+









Make a copy of your Java programs to the level directory by typing the Unix commands
$ jar cvf cruise5.jar *.java
$ mkdir cruise5
$ cp *.java cruise5
$ cp cruise5.jar cruise5