Collection framework provides a way to store group of similar objects as a single unit/entity

Collection Framework

• Introduction to collection framework
• Collection interface
• Collection overview for interview preparation

List

• List interface
• ArrayList class
• LinkedList class
• Vector class
• Stack class
• ArrayList v/s Vector
• ArrayList v/s LinkedList
• List v/s Set

Set

• Set interface
• HashSet class
• LinkedHashSet class
• SortedSet interface
• NavigableSet interface
• TreeSet class
• HashSet v/s LinkedHashSet
• HashSet v/s LinkedHashSet v/s TreeSet
• List v/s Set
• HashMap v/s HashSet

Queue

• Queue interface
• PriorityQueue class

Cursors

• Enumeration
• Iterator
• List Iterator
• Enumeration v/s Iterator v/s ListIterator

Iterating Collection

• Java – Various ways to iterate through ArrayList
• Java – Various ways to iterate through Vector – 5 ways
• Java – Various ways to iterate through LinkedList – 5 ways
• Java – Various ways to iterate through HashSet – 3 ways
• Java – How to reverse LinkedHashSet contents ?
• Java – Various ways to iterate through TreeSet – 3 ways
• Java – Various ways to iterate over List of HashMap
• Java – Ways to iterate over HashMap of ArrayList
• Java – Various ways to iterate Arrays – 5 ways
• Java – How to remove elements while iterating collection object ?
• Java – How to add/remove/modify an element in List while iterating ?

Iterating Collection in Java 8

• Java 8 – Iterating List using forEach() method
• Java 8 – Iterating Set using forEach() method
• Java 8 – Iterating Map using forEach() method

Comparable & Comparator 

• Comparable
• Comparator
• Comparable v/s Comparator

Sorting Collection

• Java – Sorting ArrayList using Comparable and Comparator
• Java – Sorting ArrayList in descending order
• Java – How to sort LinkedList using Collections.sort() method ?
• Java – How to sort Vector using Collections.sort() method ?
• Java – Sorting list of objects on multiple fields using Comparator
• Java – Sorting HashSet contents in ascending and descending order
• Java – How to Sort HashSet in 2 ways ?
• Java 8 – How to sort HashSet ?
• Java – How to sort LinkedHashSet contents ?
• Java – How to sort TreeSet in descending order using Comparator ?
• Java – Sorting Collection of String, StringBuffer and StringBuilder
• Java – Sorting ArrayList in descending order
• Java 8 – Sorting ArrayList using sort() method of List
• Java – How to Sort String List by its length in Ascending/Descending order ?

Map

• Map interface
• Entry interface
• HashMap class
• LinkedHashMap class
• IdentityHashMap class
• WeakHashMap class
• SortedMap interface
• NavigableMap interface
• TreeMap class
• Hashtable class
• HashMap vs LinkedHashMap
• HashMap v/s LinkedHashMap v/s TreeMap
• HashMap v/s HashSet
• HashMap v/s Hashtable
• Properties class

Iterating Map

• Java – Various ways to iterate through HashMap – 5 ways
• Java – To reverse the order of LinkedHashMap contents
• Java – Various ways to iterate through TreeMap – 5 ways
• Java – Various ways to iterate through Hashtable – 6 ways
• Java – Various ways to iterate over HashMap of ArrayList

Sorting Map

• Java – Sorting HashMap by Keys and Values
• Java – Converting Unordered HashMap into Sorted TreeMap
• Java – How to sort LinkedHashMap by its Keys ?
• Java – How to sort LinkedHashMap by its Values ?
• Java – How to Sort TreeMap by it Keys in descending-order ?
• Java – Sorting Hashtable contents
• Java 8 – Sorting HashMap by Keys and Values using Stream
• Java 8 – How to Sort HashMap entries by its Keys – 6 ways ?
• Java 8 – How to Sort HashMap entries by its Values – 6 ways ?

Collections class

• Java – Collections class a utility class for Collection
• Java – Sorting ArrayList using Comparable and Comparator
• Java – Searching element from ArrayList using Binary Search Algorithm
• Java – How to Reverse order of elements in ArrayList ?
• Java – How to Reverse order of Comparator ?
• Java – How to count duplicate elements of ArrayList ?
• Java – How to swap elements of ArrayList ?
• Java – How to copy elements of one ArrayList to another List ?
• Java – How to shuffle elements of ArrayList and Arrays ?

Unmodifiable version or Read-only

• Java – How to make List or ArrayList unmodifiable List or read-only ?
• Java – How to make Set or HashSet unmodifiable Set or read-only ?
• Java – How to make Map or HashMap unmodifiable Map or read-only ?
• Java – How to make any Collection class as unmodifiable Collection or read-only ?

Synchronized version

• Java – How to get synchronized version of List ?
• Java – How to get synchronized version of Set ?
• Java – How to get synchronized version of Map ?
• Java – How to get synchronized version of Collection ?

Arrays

• Arrays class
• Arrays v/s ArrayList
• Java – Various ways to iterate Arrays in 5 ways
• Java – How to Iterate over char[] Arrays ?
• Java – How to print an Arrays elements in 8 ways ?
• Java – How to find duplicate in String Arrays ?
• Java – Various ways to remove duplicate elements from Arrays in 5 ways
• Java – Searching element from Arrays using Binary Search Algorithm
• Java – How to check whether a number exists in an Arrays or List ?

Arrays Sorting

• Byte Arrays sorting
• char Arrays sorting
• short Arrays sorting
• Integer Arrays sorting
• Float Arrays sorting
• Double Arrays sorting
• Long Arrays sorting
• String Arrays sorting
• Java – How to Sort Arrays in Ascending and Descending order ?
• Java – String Arrays sorting in ascending & descending order
• Java – Sorting after merging two String[] Arrays
• Java – Sorting Arrays using Comparable and Comparator interface
• Java – How to Sort String[] arrays by its length in Ascending/Descending order ?

ArrayList operations

• Java – Creating ArrayList using nCopies method of Collections class
• Java – How to get size or length of an ArrayList ?
• Java – Adding element to ArrayList at specified index position
• Java – Remove element from ArrayList at specified index position
• Java – How to delete a element and delete all elements of an ArrayList ?
• Java- How to get sublist from ArrayList ?
• Java – How to check whether particular element is present in ArrayList ?
• Java – Comparing two ArrayList objects using containsAll() method
• Java – Adding one ArrayList to another ArrayList using addAll() method
• Java – Replacing ArrayList element with new value using set() method
• Java – Various ways to iterate through ArrayList
• Java – How to reverse ArrayList contents ?
• Java – Remove duplicate elements from ArrayList
• Java – How to remove duplicate elements of ArrayList maintaining insertion-order ?

LinkedList operations

• Java – Iterating LinkedList in reverse order
• Java – LinkedList specific method examples
• Java – Push and pop operations with LinkedList

Set operations

• Java – How to get size or length of HashSet ?
• Java – How to delete a element and delete all elements of HashSet ?
• Java – retainAll() method explanation with HashSet
• Java – How to check whether particular element is present in HashSet ?
• Java – Comparing two HashSet objects using containsAll() method
• Java – Adding one HashSet to another HashSet using addAll() method
• Java – Various ways to iterate through HashSet
• Java – How to reverse LinkedHashSet contents ?
• Java – Sorting HashSet contents in ascending and descending order
• Java – How to Sort HashSet in 2 ways ?

Map operations

• Java – How to get all keys of a HashMap ?
• Java – How to get all values of a HashMap ?
• Java – How to get all Entries or Key-Value pairs of HashMap ?
• Java – How to get size or length of HashMap ?
• Java – How to check whether a particular key is present in HashMap ?
• Java – How to check whether a particular value is present in HashMap ?
• Java – How to check whether HashMap is empty or not ?.
• Java – Adding one HashMap to another HashMap using putAll method
• Java – How to delete an entry of HashMap ?
• Java – How to delete all entries of HashMap ?
• Java 8 – How to remove an entry from HashMap by comparing values
• Java 8 – How to remove an entry from HashMap by comparing keys
• Java 8 – How to store multiple values for single key in HashMap ?
• Java – Various ways to iterate through HashMap
• Java – To reverse order the LinkedHashMap contents
• Java – How ConcurrentModificationException can be handled ?

Conversion and how-to programs

• Java – Conversion of List to Map
• Java – Conversion of Map to List
• Java – Conversion of Arrays to List
• Java – Conversion of List to Arrays
• Java 8 – Conversion of List to Map
• Java 8 – Conversion of Map to List
• Java 8 – Conversion of Arrays to List
• Java 8 – Conversion of List to Arrays
• Java – Conversion of ArrayList to Arrays in 2 ways
• Java – Conversion of Arrays to Vector
• Java – Conversion of Arrays to HashSet
• Java – Conversion of HashSet to Arrays
• Java – Conversion of LinkedList into Vector
• Java – Converting Ordered ArrayList into Sorted TreeSet
• Java – Conversion of ArrayList into HashSet to remove duplicate elements
• Java – How to convert LinkedList to contain unique elements in ascending-order ?
• Java 8 – How to convert HashMap to ArrayList ?

Min/Max or Largest/Smallest programs

• Java – How to get maximum element from ArrayList ?
• Java – How to get minimum element from ArrayList ?
• Java – Find Largest number in an Arrays or List ?
• Java – Find Smallest number in an Arrays or List ?
• Java – Find 2^nd Largest number in an Arrays or List ?
• Java – Find 2^nd Smallest number in an Arrays or List ?
• Java – Find sum of Largest 2 numbers in an Arrays or List ?
• Java – Find sum of Smallest 2 numbers in an Arrays or List ?
• Java – Find 1^st and Last elements in an Arrays ?
• Java – Find 1^st and Last elements in a List or ArrayList ?
• Java – Find 1^st and Last elements in a Set or HashSet ?
• Java – Find 1^st and Last entries in a Map or HashMap ?
• Java – Find sum and average of a List or ArrayList ?
• Java – How to calculate sum and average of an Arrays ?

Longest & Shortest programs

• Java – Find Longest String in an Arrays or List ?
• Java – Find Shortest String in an Arrays or List ?
• Java – Find 3^rd Longest String in an Arrays or List ?
• Java – Find 3^rd Shortest String in an Arrays or List ?
• Java – Find all longest Strings in List or Arrays ?
• Java – Find all shortest Strings in List or Arrays ?

Interview Question & Answers

• Java Collection Interview question and answers

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