Computer Science

Faculty of Engineering, LTH

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Lab and exercise information

Lab enrollment

When the enrollment system is open (see News section for time info and the link for enrollment). Two at a time or single persons can register. The enrollment system will place each person that signs up individually in a random group. There is no strict rule that you have to work with the one you are paired with, but it should be the normal case. You can develop your solution by yourself prior to the lab session, and just present it there (but most often enhancements are needed before you pass). After a passed lab each person is required to have a running solution, and you must be able to explain how it works.


The problems and instructions for each exercise/lab can be found at the end of the course booklet, available as pdf in the material and reading section. At the very end of that document there are even the solutions to the exercises (but not to the labs; you should have your well-working solution), to be checked after you solved it.

Handout code

The zip as of the last year (2015) is available here, including Eclipse projects containing handout code for the labs (and some of the exercises). See coding/design issue below concerning the use of this workspace.

Installation (with slight variations depending on eclipse version): create a workspace in Eclipse, choose "file->import", pick "general/existing projects into workspace", select archive file and browse to your zip, import all projects.

Coding/design issue: The workspace from 2015 has AlarmClock as a Thread subclass, as a simple way of having the handout code runnable. If this (AlarmClock being a Thread object) is what you really want you can keep the code as it is. However, consider another design with AlarmClock corresponding to main (as it is in this simulator inside an applet). Then you remove the inheritance from Thread, and you add a start method that simply starts whatever Thread objects you created in the main program (i.e. in the AlarmClock constructor).

A new zip with an eclipse HT16 workspace for lab 1 is available here. However, there are changes that should have been reflected in the course material, i.e., for exercise 1 and 2. You can either:

  1. Stick to the above HT15 workspace and the instructions already distributed, and ignore HT16 workspace.
  2. Use the above HT15 workspace as it agrees with the exercises and documentation, but download and look into the HT16 workspace in case there are some useful/interesting hints/details.
  3. Only use the new HT16 workspace (import as for HT15) and change/write your code accordingly (as should be more or less clear from the sources).

In particular the following has been changed in the HT 16 workspace:

  • The AlarmClock class is not a thread, the start method is changed, the semaphore from ClockInput has a new name, a terminate method is added for the optional task, changes in the ClockOutput is reflected, and the example Runnable code more completely demonstrates the input and output features.
  • The ClockGUI no longer periodically (in a system dependent manner) signals the semaphore when buttons are held down.
  • The ClockOutput has some methods for console printout, and the beep is added as AWT bell sound.

There is still (to be fixed in the next version) a race condition when buttons are pushed very frequently on a loaded computer, so your programs do not need to be robust with respect to that specific situation.


For the lab-preparation parts of the exercises, you have your fully working implementation as the solution. Solutions to the other exercises will be published here on Wednesdays at 8PM after each exercise session.

Currently defined Lab/Exercise groups

The following is a snapshot from the database.
Group D is recommended for exchange students.