Java Collections Coding Practice Problems Last Updated : 05 Mar, 2025 Summarize Comments Improve Suggest changes Share Like Article Like Report Java Collections provides dynamic and efficient data structures for handling and processing data. This collection of Java practice problems covers fundamental concepts of ArrayLists, LinkedLists, Stacks, Queues, Deques, PriorityQueues, HashMaps, and TreeSets, helping you master data manipulation, searching, sorting, and advanced operations. Whether you are a beginner or looking to enhance your problem-solving skills, these exercises will build a strong foundation in Java Collections.Java Collections Practice QuestionsBasic:ArrayList InsertionArrayList OperationsArrayList Iterate Front to BackAverage of an ArrayListCheck Sorted ArrayListMax and Min In ArrayListGet Smaller ElementsArrayList Separate Even OddLinkedList InsertionLinkedList TraversalStack DesignerOperations on StackQueue OperationsQueue TraversalQueue ReversalDeque ImplementationsInsertion in DequeDequeue TraversalDeque DeletionRotate Deque By KPriorityQueue Insertion - 1PriorityQueue Insertion - 2HashMap OperationsTreeSet OperationsTreeMap OperationsFill LinkedListEasy:Minimum Vertical SumMaximum Neighbours In ArrayListLinkedList Josephus CircleDelete Mid of a StackRemoving Consecutive DuplicatesRemoving Consecutive Duplicates - 2Parenthesis CheckerShopkeeper ProfitGet Min at PopQueue using Two StacksReverse First K Elements of QueueGenerate Binary NumbersK Sized Subarray MaximumOperations on PriorityQueueHashing for Pair - 1Hashing for Pair - 2Union of Arrays with DuplicatesUnique SubstringsIntersection of Arrays with DistinctDistinct SortedPrint Different Characters in Sorted MannerElected CandidateTie BreakerFrequency CountCount Non-Repeated ElementsFirst Repeating ElementSubarray with 0 SumSorted FrequencyCommon ElementsSort an ArrayListAre LinkedLists EqualMedium:Maximize Number of ToysMinimum Cost of RopesKth Largest ElementKth Smallest ElementRotate LinkedList By KThis set of practice questions covers everything from basic operations on ArrayLists and LinkedLists to more advanced topics like priority queues and hashing. Whether you're just starting out or want to sharpen your problem-solving skills, these exercises will help you get comfortable with essential data structures. Comment More infoAdvertise with us Next Article Java Methods Coding Practice Problems S swetadash2000 Follow Improve Article Tags : Java Java-Collections Practice Questions Practice Tags : JavaJava-Collections Similar Reads Java Fundamentals Coding Practice Problems Understanding Java fundamentals is the first step to becoming a proficient Java programmer. This collection of Java basic coding practice problems covers essential topics such as input/output operations, arithmetic and logical operators, type conversion, conditional statements, loops, and more. Thes 1 min read Java OOPs Coding Practice Problems Object-Oriented Programming (OOP) is a core concept in Java that enables code modularity, reusability, and scalability. This collection of Java OOPs coding practice problems covers essential topics like class design, constructors, encapsulation, inheritance, and abstraction. Whether you are a beginn 2 min read Java Arrays Coding Practice Problems Arrays are a fundamental data structure in Java programming, enabling efficient storage, manipulation, and retrieval of elements. This collection of Java array practice problems covers essential operations, including array traversal, sorting, searching, matrix manipulations, and element-wise calcula 2 min read Java Methods Coding Practice Problems Methods in Java help in structuring code by breaking it into reusable blocks. They improve readability, maintainability, and modularity in programming. This collection of Java method coding practice problems covers functions with return values, functions with arguments, and functions without argumen 1 min read Java Strings Coding Practice Problems Strings are a fundamental part of Java programming, used for handling and manipulating textual data efficiently. This collection of Java string practice problems covers key operations such as finding string length, slicing, case conversion, palindrome checking, anagram detection, and pattern matchin 2 min read Introduction to Java Java is a high-level, object-oriented programming language developed by Sun Microsystems in 1995. It is platform-independent, which means we can write code once and run it anywhere using the Java Virtual Machine (JVM). Java is mostly used for building desktop applications, web applications, Android 4 min read Like