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COMP2100

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COMP 2100/2500/6442: Lab 2 - Tools for Software Development

The objective of this lab is to master the use of practicing revision control with git. The mini-test aims to evaluate your ability to complete some basic tasks along with further sharpening your Java programming skills.

Pre-lab Tasks - Mastering key tools [1 mark]

The first 10 minutes of the lab session time may be spent by your tutor to mark pre-lab tasks.

GIT

Using the command line on a Linux machine:

• Create a public and private key within your lab account. Add the public key to your gitlab profile.
• Create a project and clone it to two different directories. Now you have two clones of the project on your local machine.
• See how a change in one repo can be reflected into the other repo on your local system (via the gitlab server)
• Modify the same line in both of the local repos to create a conflict, resolve this conflict
• Login to the gitlab server and have a look at the projects "Files", "commits", "network", and "graphs".
• Click on the nodes in the "network" view to see the difference a particular commit has made. How can you see the conflict being resolved?

Mini-test - Java Programming [3 marks]

Guidelines

• Create a project called mini_tests on your CECS gitlab server
• Add your tutor as master to this project
• Any code that is written in this mini-test must be committed and pushed to your mini_tests repo before it is evaluated by your tutor
• Solutions must be written in Java
• Any text editor or IDE may be used

Your tutor will select one problem at random from the four options below and ask you to complete it correctly in the duration of the lab time. You may ask your tutor for a problem as soon as your pre-lab excercise is marked off. Start coding as soon as you are handed a problem!

In order to attain full marks, your solution must be correct. Your tutor may also decide to award some marks for a good attempt, in case of an incorrect or unfinished solution.

Remember, this is an individual exercise and must not be attempted collaboratively. However, feel free to discuss solutions to these problems with your colleagues before you attend this lab session.

Problem 1

Print out n using a recursive function. A fibonacci number is calculated by adding the previous two numbers in the series. A fibonacci series starts with 0, 1. The program must accept as input the value of n. For example, given n=6, the program must print 0, 1, 1, 2, 3, 5. The minimum value of n is 2.

Problem 2

Create an interface called TextDraw that has a method signature "void draw();". Create two classes, one called Box and the other Triangle. Both must implement the TextDraw interface. The draw() method in Box must draw a box to standard out using the '#' character. Whereas, Triangle triangle must draw a triangle. Create a class called DemoTextDraw which only has a main() method that contains:

   TextDraw box = new Box();   TextDraw tri = new Triangle();   box.draw();   System.out.println("-------------------");   tri.draw():

This would output:

############------------------##########

Problem 3

Print the following quadrilateral pattern, where n depicts the maximum horizontal width. For example, if n=5, the following pattern is printed:

  # ######## ###  #

The program must accept n as input. Assume that n is an odd integer with values ranging between [3,15]

Problem 4

Create a class called Shape that has an abstract method signature "void draw();". Create two classes, one called Box and the other Triangle, both extending the Shape class. The draw() method in Box must draw a box to standard out using the '#' character. Whereas, Triangle must draw a triangle. Create a class called DemoTextDraw which only has a main() method that contains:

   Shape box = new Box();   Shape tri = new Triangle();   box.draw();   System.out.println("------------------");   tri.draw():

This would output:

############------------------##########

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