University of Leicester – Department of Computer Science

M.Sc. of Software Engineering in The E-economy

2004/2005 - System Reengineering CO7206

Labs 2 (19 Nov.), 3 (24 Nov.) and 4 (26 Nov.)

Objective: (1) Applying Refactoring on a code base. (2) Learning to use a tool, IntelliJ, for Refactoring java code. (3) Learning to automate testing using JUnit.

In these three labs, students will try out a java integrated development environment (IDE) that supports refactoring. We will try IntelliJ IDEA from JetBrains, which is a rich java IDE with built-in refactorings. This allows you to mark the variable, code, etc. of interest and then ask IntelliJ IDEA to apply a particular Refactoring with a mouse click. However, it is important to remember that the tool does not think. In other words, it is your job to examine a subject system carefully, discover the bad smells, and then remove them with an appropriate refactoring(s). The tool’s job is to automate the refactoring application. Also, it is important to know that refactoring depends on the programmer’s experience, style and preferences. So, there is not one right solution for every refactoring exercise.


These are the activities to perform in the three labs assigned to refactoring. My estimate is that each lab will need about an hour to perform the basic tasks. If you finish one set of activities in less than an hour, proceed to the next set.

Lab 2: 19 Nov. @ 9:30 am

1-     Start IntelliJ and follow the instructions emailed to you to enter the required password and license key and to set your project directory.

2-     Familiarize yourself with IntelliJ and read the relevant documentation (e.g., there is an overview, online help and tutorials)

3-     Load, compile and run the original version of the refactoring example given in the class.

4-     Load or write, compile and run your own java examples and programs.

5-     Review the refactoring example given in the class and see how code evolved step by step. Think of the relational behind each step and think for yourself whether you agree or not with doing this step.

Lab 3: 24 Nov. @ 11:30 am

6-     Try out JUnit, read its Cookbook and other documentation

7-     Read the online help of IntelliJ to see how to use JUnit from IntelliJ

8-     Use JUnit to build a comprehensive test suite for the original version of the refactoring example given in the class. Try this test suite for some of the later (refactored) versions of the program and see if they pass the test.

9-     Read the about the refactors supported by IntelliJ and how to perform them (this info is in the online help and possibly in other documentasions as well)

Lab 4: 26 Nov. @ 9:30 am

10- Review this example code, compile it and run it. You may need to adjust some directory

Some Useful Resources:

q (JUnit is integrated with IntelliJ)

q       JUnit Cookbook

q       CO7206 Reading List under Blackboard

q       The class example code, step by step