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Java-Collections

1.1K+ posts

How does LinkedHashMap maintain Insertion Order?

Last Updated: 05 February 2024

LinkedHashMap in Java maintains the order of elements based on which they were inserted. It achieves this by using a doubly-linked list internally to maintain the order of...read more

Split a Vector into Multiple Smaller Vectors in Java

Last Updated: 09 February 2024

In the realm of Java programming, the manipulation of vectors is a common task. One particularly useful operation is splitting a vector into multiple smaller vectors. This...read more

Calculate the Sum and Average of Elements in an ArrayList in Java

Last Updated: 12 February 2024

A Dynamic and Adaptable method for storing and managing collections of elements is to use ArrayList. Finding the total and average of an ArrayList's items is frequently re...read more

How to Convert an ArrayList or an Array into a TreeSet in Java?

Last Updated: 05 February 2024

In Java, ArrayList allows random access because it works like an array. It means you can access any element by its index in O(1) at any time. A TreeSet is a sorted set imp...read more

How to Add or Append Elements to End of a TreeSet in Java?

Last Updated: 05 February 2024

A TreeSet is a sorted set implementation of the Set interface based on a TreeMap. It uses a Red-Black tree to store elements. Elements are sorted according to their natura...read more

How to Retrieve a Specific Value From a HashMap Using Key?

Last Updated: 09 February 2024

A HashMap is a data structure that implements a map interface in Java. It stores key-value pairs. On the key object's hashcode, it uses a hashing function for computing an...read more

How to Initialize a Vector with a Specific Initial Capacity in Java?

Last Updated: 12 February 2024

In Java, Vector Class allows to creation of dynamic arrays that can grow or shrink as per the need. If we know the approximate size of elements, we will store this in the ...read more

How to Copy Key-Value Pairs from One TreeMap to Another in Java?

Last Updated: 06 February 2024

In Java, a TreeMap is a Map implementation that stores key-value pairs in a red-black tree structure. It allows insertions and deletions of key-value pairs due to its tree...read more

How to Customize the Ordering of Elements in a PriorityQueue Using a Comparator in Java?

Last Updated: 15 February 2024

A PriorityQueue is a data structure that allows elements to be processed based on their priority. By default, it orders elements according to their natural ordering (e.g.,...read more

How to Handle Concurrent Access and Modification of a TreeMap Using Concurrent Collections in Java?

Last Updated: 14 February 2024

To solve data corruption in a multithreaded context, and thread safety, Java offers concurrent collections in the java.util.concurrent package. In this article, we will le...read more

Java Collection Exercise

Last Updated: 12 March 2024

The Java Collection framework is a fundamental part of the Java programming language, It covers a major part of Java and acts as a prerequisite for many Advanced Java Topi...read more

Java-Collection-Programs

How to Optimize Memory Usage and Performance for large HashSet Datasets in Java?

Last Updated: 05 April 2024

HashSet is mainly used for the data structures in Java offers fast access and prevents duplicate elements. So, the size of the dataset will be improved and it can raise me...read more

How to Sort an Arrays of Object using Arrays.sort()

Last Updated: 13 June 2024

To sort the array of objects in both ascending and descending order in Java, we can use the Arrays.sort() method with the Comparator. In this article, we will learn how to...read more

Last Updated: 03 November 2024

In Java, there are multiple ways to use built-in libraries for Stack.Stack Class It is a legacy collection from early Java versions. It is outdated and rarely used in mod...read more

Java Collections Coding Practice Problems

Last Updated: 05 March 2025

Java Collections provides dynamic and efficient data structures for handling and processing data. This collection of Java practice problems covers fundamental concepts of ...read more

Java

Java-Collections

Practice Questions

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