CoreJava

• Map
• Comparable & Comparator
• Immutable Class
• Java 8 (Stream, Predicate, Optional)

DataStructure

• LinkedList
• Doubly LinkedList
• Circular LinkedList
• Queue
• Stack
• Binary Tree
• Binary Search Tree
• Searching (Binary Search & Linear Search)

MultiThreading

• ThreadPool
• DeadLock
• Callable
• Future

Concurrent API

• Blocking Queue
• CountDownLatch
• Cyclic Barrier
• Semaphore
• Exchanger
• Locks

Design Pattern

• Singleton
• Factory
• Abstract Factory
• Observer
• Builder

HackerRank Solution

GeeksForGeeks

Note: Token Generation Issue : https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens