
Book: Data Structures and Algorithms Made Easy In Java
by Narasimha KarumanchiThe official companian source code for the book Data Structures and Algorithms Made Easy In Java by Narasimha Karumanchi
The following topics are covered: Introduction
 Recursion and Backtracking
 Linked Lists
 Stacks
 Queues
 Trees
 Priority Queue and Heaps
 Disjoint Sets ADT
 Graph Algorithms
 Sorting
 Searching
 Selection Algorithms [Medians]
 Symbol Tables
 Hashing
 String Algorithms
 Algorithms Design Techniques
 Greedy Algorithms
 Divide and Conquer Algorithms
 Dynamic Programming
 Complexity Classes
 Miscellaneous Concepts

Data Structures and Algorithms in Java
by indy256Full version of library on github.
Collection of algorithms and data structures in Java written by indy256
The following topics are covered:
 Trees: segment tree, Fenwick tree, kd tree, Rtree, metric tree, quadtree, persistent tree, link/cut tree, binary heap, disjointsets, treap
 Graph algorithms: shortest paths, maximum flow, maximum matching, spanning tree, connectivity, biconnectivity, LCA
 String algorithms: suffix tree, suffix automata, suffix array, trie, AhoCorasick algorithm, KnuthMorrisPratt algorithm, Zfunction, hashing, parsing
 Sorting algorithms: quick, merge, heap, bubble, selection, insertion, counting, radixsorting; Kth order statistic
 Geometry algorithms: segments/lines/circles intersection, point in polygon query, convex hull, closest/furthest pair of points
 Combinatorics: permutations, combinations, arrangements, partitions
 Other: big numbers multiplication via fast Fourier transform, simplex algorithm

Popular Algorithms in Java
by jeandersonbcFull version of library on github.
Clean and readable Java implementation for popular algorithms like sorting, searching and many more written by github user jeandersonbc.
The following topics are covered:
 Sorting algorithms: Multiple variants of quick sort, insertion sort and merge sort
 Search algorithms: Linear and Binary search algorithms
 Other: Fast implementation of power function, maximum sum subarray, inversions.