ayeujjawalsingh / Java-Practice-Codes-And-Notes

Java Notes & Codes for better understanding and it contains all the funtions with examples and also added Cheat Sheet for Revision...

Complete Java + DSA Syllabus

Syallbus

• Functions

  • Scoping in Java
  • Shadowing
  • Variable Length Arguments
  • Overloading

• Arrays

  • Memory management
  • Input and Output
  • ArrayList Introduction
  • Searching
    • Linear Search
    • Binary Search
    • Modified Binary Search
    • Binary Search on 2D Arrays
  • Sorting
    • Insertion Sort
    • Selection Sort
    • Bubble Sort
    • Cyclic Sort

• Pattern questions(Self Practice)

• Strings

  • How Strings work
  • Comparison of methods
  • Operations in Strings
  • StringBuilder in java

• Maths for DSA

  • Complete Bitwise Operators
  • Range of numbers
  • Prime numbers
  • Sieve of Eratosthenes
  • Newton's Square Root Method
  • Factors
  • Modulo properties
  • Number Theory
  • HCF / LCM
  • Euclidean algorithm

• Recursion

  • Flow of recursive programs - stack
  • Tree building of function calls
  • Tail recursion
  • Sorting
    • Merge Sort
    • Quick Sort
  • Backtracking
    • N-Queens
    • N-Knights
    • Sudoku Solver
    • Maze problems
  • Recursion String Problems
  • Recursion Google, Amazon Questions
  • Recursion Array Problems
  • Recursion Pattern Problems
  • Subset Questions

• Space and Time Complexity Analysis

  • Comparisons of various cases
  • Solving Linear Recurrence Relations
  • Solving Divide and Conquer Recurrence Relations
  • Big-O, Big-Omega, Big-Theta Notations
  • Little Notations
  • Get equation of any relation easily - best and easiest approach
  • Complexity discussion of all the problems we do
  • Space Complexity
  • NP-Completeness Introduction

• Object Oriented Programming

  • Classes & its instances
  • this keyword in Java
  • Properties
    • Inheritance
    • Abstraction
    • Polymorphism
    • Encapsulation
  • Overloading & Overriding
  • Static & Non-Static
  • Packages
  • Access Control
  • Interfaces
  • Abstract Classes
  • Annotations
  • Singleton Class
  • final, finalize, finally
  • Object Cloning
  • Object Class
  • Generics
  • Exception Handling
  • Collections Framework
  • Vector Class
  • Lambda Expression
  • Enums

• Linked List

  • Singly + Doubly + Circular LinkedList
  • Fast and slow pointer
  • Cycle Detection
  • Reversal of LinkedList
  • Linked List + Recursion

• Stacks & Queues

  • Push efficient
  • Pop efficient
  • Circular Queue
  • Queue using Stack and Vice versa
  • Interview problems

• Trees

  • Binary Trees
  • Binary Search Trees
  • DFS
  • BFS
  • AVL Trees
  • Segment Tree

• Heaps

  • Theory
  • Priority Queue
  • Heapsort
  • Two Heaps Method
  • k-way merge
  • Top k elements
  • Interval problems

• HashMap

  • Theory - how it works
  • Comparisons of various forms
  • Limitations and how to solve
  • Map using LinkedList
  • Map using Hash
  • Count Sort
  • Radix Sort
  • Chaining
  • Probing
  • Huffman-Encoder

• Subarray Questions: Sliding window, Two Pointer, Kadane's Algorithm

• Graphs

  • BFS
  • DFS
  • Working with graph components
  • Minimum Spanning Trees
  • Kruskal Algorithm
  • Prims Algorithm
  • Dijkstra’s shortest path algorithm
  • Topological Sort
  • Bellman ford
  • A* pathfinding Algorithm

• Dynamic Programming

  • Recursion + Recursion DP + Iteration + Iteration Space Optimized
  • Complexity Analysis
  • 0/1 Knapsack
  • Subset Questions
  • Unbounded Knapsack
  • Subsequence questions
  • String DP

• Greedy Algorithms

• Tries

Advanced concepts apart from interviews

• Fast IO
• File handling
• Bitwise + DP
• Extended Euclidean algorithm
• Modulo Multiplicative Inverse
• Linear Diophantine Equations
• Matrix Exponentiation
• Mathematical Expectation
• Catalan Numbers
• Fermat’s Theorem
• Wilson's Theorem
• Euler's Theorem
• Lucas Theorem
• Chinese Remainder Theorem
• Euler Totient
• NP-Completeness
• Multithreading
• Fenwick Tree / Binary Indexed Tree
• Square Root Decomposition