This repository contains solved homework problems from the Java Course at the Faculty of Electrical Engineering and Computing, held by lecturer izv. prof. dr. sc. Marko Čupić.
- wrote a few simple programs in Java; no object-oriented paradigm is used here
- implemented a custom array-backed and linked-list-backed collections
- created a ComplexNumber class, which supports various features, including parsing a string into a ComplexNumber
- implemented a lexer and a parser for a custom script language - SmartScript
- implemented a custom hash table collection, which uses a linked list for collision resolution
- wrote a simple database emulator (which relies on the previously created collection) which allows query commands for fetching various items from the database
- implemented a simple notification system for numerical changes which uses the Observer design pattern
- created a collection for generating prime numbers
- created the ObjectMultistack collection which behaves in a map-like way, but instead of mapping a single key to a single value, it maps a key to a stack of values. Talk about abstraction...
- used the Java Stream API for manipulating various collections
- created a program which allows encryption and decryption of files using the AES algorithm and offers calculation and verification of the SHA-256 file digest.
- implemented a custom shell interface, MyShell, with which the user can interact with. This is a list of available commands:
- cat - writes the contents of the specified file onto the console
- copy - copies the specified file to another location
- exit - terminates the shell
- hexdump - dumps a hex representation of the contents of the specified file onto the console
- charsets - lists all available system charsets onto the console
- ls - lists all files and directories in the specified directory
- mkdir - creates a new directory on the specified location
- symbol - prints out or replaces the shell prompt symbol
- tree - writes a tree-like structure of the specified directory to the standard output, recursively listing all files and subdirectories under the given directory
- help - provides help for the specified command (
help helpis also allowed — how meta is that?!)
- implemented a lexer which accepts the following logical operators: AND, OR, NOT, XOR
- implemented a recursive descent parser which supports the following grammar:
E1 -> E2 (OR E2)*
E2 -> E3 (XOR E3)*
E3 -> E4 (AND E4)*
E4 -> NOT E4 | E5
E5 -> VAR | CONST | '(' E1 ')'- implemented a truth table generator
- implemented an expression evaluator for evaluating boolean expressions
- implemented a few other boolean expression details
- implemented the Quine McCluskey algorithm for minimizing boolean functions
- the minimizer uses the services of the Boolean Expression Parser implemented in the previous homework, for evaluating boolean expressions during the minimization
- implemented a logger which displays the current progress of the algorithm (to the console by default, but this can be changed by modifying the
logging.propertiesfile
- implemented a simple library for working with 3D vectors, complex numbers and polynomials
- using the previously written complex number and polynomial libraries, implemented an algorithm for calculating Newton-Raphson fractals and displaying the obtained result visually
- using the 3D vector library, implemented a ray-caster for rendering 3D scenes and visually displaying the obtained result
- implemented a custom layout manager - CalcLayout - for managing the elements of a custom calculator
- implemented a custom calculator which supports default calculating operations (addition, subtraction, multiplication, division) as well as some scientific operations (trigonometric and inverse trigonometric functions, exponents, logarithms etc.)
- implemented a bar chart for dynamically displaying a collection of (x, y) pairs
- implemented a simple generator of prime numbers in Swing
- created JNotepad++ - a simple Notepad++ clone with the following funcionality:
- creating a new blank document,
- opening existing document,
- saving document,
- saving-as document,
- closing currently open document,
- cut/copy/paste text,
- statistical info,
- exiting application.
- various tools such as changing case, sorting the lines, removing duplicate lines etc.
- upgraded the basic version of the program to support internationalization (i18n): the program supports Croatian, English and German languages
- created SmartScriptHttpServer - a multithreaded HTTP server
- the server supports executing SmartScript script files, by using the SmartScript parser implemented in the Homework #03
- server properties are configured in the file
server.propertiesand it's supported MIME types are configured in themime.propertiesfile - implemented several "workers" - simple programs whose job it is to produce some result and deliver it to the user. The implemented workers are:
- SumWorker - obtains URL parameters from the user, performs an addition operation among them and displays the result in a table on an HTML document which is delivered to the user
- HelloWorker - displays a simple "Hello World" message when a user navigates to a certain URL of the server
- CircleWorker - obtains URL parameters from the user representing several circle parameters, creates the circle and sends it back to the user in the image/png MIME type format (a .png image)
- implemented Cookie handling - the user can access a certain resource on the server, and the server will remember this user in a session map for a certain amount of time (defined in
server.properties)