Tasks about input from keyboard
Tasks about conditional statements and loops
0502 and 0505 - Method of implementing a fight between two cats (fight(Cat anotherCat))
Tasks about initialization (constructor analog), getters / setters, constructors
0521 - Calling a constructor from a constructor
Finalize and Garbage Collector
0612 - Casting of primitive types
Tasks about statics
0621 - Family relations of cats (about objects within another objects)
Arrays and ArrayLists
0724 - Family relations, objects within another objects
Tasks about sets and maps, a difference between LinkedList and ArrayList
0822 - Usage of built-in Collections class
0823 - An algorithm that capitalizes a first letters of words in a string
0824 - Family relations (objects within another objects + ArrayList usage)
0826 - Sorting and reversing an order of numbers in an array via Collections
0809 and 0810 - Calculating a time difference
0816 - Date parsing and removal from the map by date
0827 - Counting a number of days since the beginning of the year (even / odd) from a parameter - string
0830 - Arrays.sort and compareTo
0818 - Iterator implementation
Tasks about StackTrace, Exceptions
0922 - String to Date conversion by SimpleDateForman pattern
0927 - Map to Set conversion
0928 - Reading data from a file and writing to another
0929 - Reading data from a file and writing to another
0930 - After entering as input numbers and strings mixed - sorting numbers in ascending order, rows in descending order.
Collections methods usage
Type Casting
1012 - Entering 10 lines as input and counting letters of the alphabet in them using a map
1016 - Entering 10 lines as input and counting the number of identical words using a map
1020 - Array Sort implementation
Inheritance, incapsulation, access modifiers
1123 - Return min and max values in an array
1204-1205, 1224-1225 instanceOf
Tasks about Overriding and Overloading
Tasks about abstract methods, classes and interfaces
1233 - Method for finding a minimum element in an array and its index
Tasks about abstract methods, classes and interfaces
1307, 1322 - Generics
1318 - Reading data from a file and writing to the console
1319 - Writing data to a file
1326 - Reading numbers from a file, printing sorted even numbers to the console
1327 - "Repka" tale implementation
1328 - "Robots fight" implementation
Tasks about polymorphism, upcasting/downcasting of objects
1401-1402, 1407, 1411, 1412, 1415 - instanceOf
1408 - Factory pattern example
1419 - Filling out an Exceptions list
1420 - Finding the greatest common divisor
1421 - Singleton pattern example
Tasks about inheritance, interfaces, method overloading
1517 - Exception in a static block
1522 - Singleton pattern example
1524 - An order of loading variables into memory
1527 - Reading an URL and removing the parameter list from it
1530 - Template pattern example
1531 - Factorial calculation via BigInteger
Tasks about multithreading (interrupt, join)
1628 - Reader.ready implementation
1630 - Reading data from file + threads
1631 - Factory pattern example
1633 - ExceptionHandler implementation
1706 ΠΈ 1707 - Singleton pattern example
Tasks about syncronized, volatile
1721 - Reading data from file
1710 - Command line arguments and CRUD operations, parsing a string into a date
1711 - Command line arguments, CRUD and multithreading, parsing string to date
1712 - Task about ConcurrentQueue
Tasks about input/output streams
1803 - Finding a byte with the maximum number of repetitions using a map
1805 - Sorting by bytecode via Collections
1808 - Bitwise writing to a different files
1811-1815 - Wrapper pattern example
1817 - Command line arguments + rounding a decimal number to a specified precision (String.formatOf)
1820 - Reading a double value from a file, rounding through Math.round and writing as a string to another file
1821 - Reading from a file, sorting by bytes in the map and displaying to console a number of bytes encountered
(using SortedMap)
1823 - Finding a frequently occurring byte via creating streams in different threads and adding to the map
1824 - Closing streams via try-catch with resources
1825 - Creating a file through a file class, writing to it using a map
1826 - Encryption and decryption when writing and reading from a file
1827 - Reading and writing to a file from command line arguments using StringBuilder
1901-1905 - Adapter pattern implementation example
1903 - StringBuilder implementation
Using the split method with a limit
1906-1910 - Tasks about FileReader/Writer
1910 - checking char for regex
1911-1915 - Replacing System.out by reader-wrapper
1914 - String.format implementation
1919 - Value update in Map
1917 - Creating a FileConsoleWriter adapter (writes to both file and a console)
1921 - String split using regex, parsing strings into dates by using patterns
1923 - Regex usage
1924 - Extracting map value by key
1926 - StringBuilder reverse method
1928 - ClassLoader example
1918 - Removing tags from an HTML file using the JSOUP library
Tasks about serialization/deserialization
2001-2005 - Saving an array of objects to a file and reading from a file, creating a temporary file
2002 - Conversion string to Enum, Date and vice versa
2003 - Properties example
2006-2013 - Tasks about Serializable, Externalizable
2008 - Singleton deserialization via readResolve method
2014-2015 - Tasks about serialization and transient fields, 2015 - with multithreading
2018 - Derived classes serialization and overriding (read write) methods
2020 - transient fields
2023 - Chain of method calls from superclasses
2025 - Armstrong numbers calculation
2026 - Calculating "1" rectangles from within a square-shaped two-dimensional array
2101 - Determining the network address, conversion of a number casted to byte into int, bitwise operations
2102 - getModifiers example
2104-2106 - equals and hashcode
2107-2109 - Task about clone method
2110-2112 - Try with resources
2112 - Example how to use an object created in try brackets inside a try block
2113 - Hyppodrome game
2201 - Threads that truncate strings by tabs, UncaughtExceptionHandler, String.format
2202, 2203 - regex + substring
2204-2206 - String.format, 2206 - Date format
2207-2209 - StringBuider
2207 - StringBuilder reverse, adding words from the list for which there are inversions
2209 - Sticking words when first letter matches a last previous one and vice versa
2210 - String Tokenizer
2211 - reading data from a file, converting to another encoding and writing to another file
2212 - Regex for finding correct phone number
2312 - Snake game console
Tasks about final
2304 - Mock with anonymous classes usage
2305-2311 - Tasks about nested, inner, anonymous classes
2413 - Arkanoid console game
2401-2403 - Marker-interfaces
2404-2405, 2407-2409 - Classes within methods, anonymous classes
2409 - getSimpleName of a class
2406 - Nested classes inheritance
2410 - Iterator pattern implementation by anonymous class
2412 - Comparator, ChoiceFormat, MessageFormat
3608 - MVC pattern big task
2501-2503 - Tasks about Enum
2504 - Enum thread state
2505 - UncaughtExceptionHandler and Daemon, String format
2506 - State logging inside other thread
2508 - interrupting Thread, Task Manipulator
2510-2512 - UncaughtExceptionHandler
2512-2513 - yield
2909 - Refactoring big task
2601-2603 - Comparator
2604-2606 - Volatile
2607-2609 - Synchronized blocks
2610 - Concurrent BlockingQueue
2611 - Concurrent Map
2612 - Concurrent Lock
3008 - Chat creating big task (Socket, Serialization, Syncronized blocks and wait/notify inside them)
2701, 2702 - break, continue, goto
2703-2708 - deadlock
2707 - Determining an order of synchronizations in a block by intentionally organizing a deadlock
2790-2710 - wait notify
2711 - countdownlatch
2801 - Enums + Switch
2802 - ThreadFactory simulation, ThreadGroup
2803 - ThreadLocalRandom
2805 - Setting thread priorities
2806 - Executors, ExecutorService
2807 - ThreadPoolExecutor
2808 - Callable
2809 - Phaser
2811 - ReentrantReadWriteLock, ReadLock, WriteLock
2812 - List of not executed tasks with ExecutorService usage
2813 - Callable, Future
3209 - HTML parser (Swing, HTML)
2901-2903 - Naming conventions
2904, 2906, 2907 - Wrappers autoboxing principles
2912 - Chain of responsibility pattern example
3001-3002, 3009, 3010 - Radixes (number systems), BigInteger and Integer methods with radixes
3003 - TransferQueue example with multithreading (consumer/producer)
3004 - RecursiveTask, ForkJoin
3006 - 3007, 3013 - bitwise operators
3012 - ternary balanced number system conversion into decimal system and vice versa
3513 - 2048 game (two-dimensional array rotations)
3101 - Reading and writing to files
3111 - SimpleFileVisitor example
3102-3104, 3113 - Operations with file trees, SimpleFileVisitor
3106 - SequenceInputStream + ZipInputStream
3112 - writing data from URL to file
3105 - reading/writing from/to ZipInputStream, ZipInputStream
3107 - Null Object pattern example
3109 - Properties class, converting files data to Properties objects
3108 - relativize method demo (Path)
2028 - custom tree implementation(big task)
3201, 3210 - RandomAccessFile examples
3202, 3203, 3213 - StringWriter/StringReader
3211 - MessageDigest/MD5 hash with ByteArrayInputStream example
3205, 3206 - Dynamic proxy/reflection example (3206 - +generics)
3207, 3208 - RMI (remote method invocation example)
3212 - Service Locator pattern example
2213 - Tetris big quest (two-dimensional array + Swing)
3301-3305, 3311, 3312 - Jackson library usage example, serialization and deserialization of JSON format
3306-3309 - XML serialization/deserialization examples
2515 - Space big task
3401-3404, 3411 - Recursion tasks (3411 - tower of Hanoi problem)
3405-3407, 3413 - Garbage collector, WeakReference, SoftReference, PhantomReference
3408 - Generics and reflection API
3409, 3412 - Logger, slf4j, log4j
3707 - HashSet manual implementation
All tasks about Generics, parametrized types, wildcards
Big task - Factory method and Abstract factory patterns example
3601, 3609 - MVC pattern implementation example
3602 - Reflection API task (getting methods, constructors etc on a fly)
3604 - Binary Tree/ Red/Black Tree implementation
3605 - FileReader, TreeSet usage
3611 - Binary Tree usage
3612 - A representation of problem: HashSet cannot find element by hash if it is mutable and has been changed
3701 - Iterator custom implementation
3708, 3709 - Proxy pattern implementation example
3710 - Decorator pattern implementation example
3711 - Facade pattern implementation example
3712 - Template method pattern implementation example
3713 - Chain of responsibility pattern implementation example
3801-3806 - Exceptions, checked and unchecked
3804 - Exception factory
3807-3812 - Annotations in java, examples of creation and using
3902-3903 - working with bits, BitSet API
4001-4002, 4010-4011 - working with HTTP in Java
4003 - communication via email in Java (embedded java EE library)
4005-4006 - working with Sockets
4007-4009, 4012 - Dates in Java, DateTime, Calendar
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent