java core

Implementing custom iterators in Java involves creating classes that implement the Iterator interface or extend classes that provide iterator functionality (Iterator or ListIterator). Custom iterators are useful when you need to define specialized traversal logic or filter elements during iteration. Let’s create an example of a custom iterator for a list of student names. Implementing […]

Creating custom collection classes in Java involves defining classes that implement the core collection interfaces (List, Set, Map, etc.) or extending existing collection classes to add custom behavior or constraints. Let’s create custom implementations for a List and a Set that store student names, focusing on simplicity and basic functionality. Here’s a simple custom implementation

1. Understand Your Requirements Criteria Description Data Operations Identify primary operations: insert, delete, search, traversal, etc. Concurrency Will multiple threads access/modify the structure concurrently? Order Is ordering important (sorted, FIFO, LIFO)? Memory Efficiency Is minimal memory usage critical, especially for large datasets? Performance How frequent and large are the operations? Optimize for speed if needed.

CopyOnWriteArrayList in Java is a thread-safe variant of ArrayList that allows concurrent access for reading while maintaining thread safety for modifications. It achieves this by creating a fresh copy of the underlying array whenever an element is added, modified, or removed, hence the name “copy-on-write.” This makes it suitable for scenarios where reads are more

ConcurrentLinkedQueue in Java is a concurrent, unbounded queue implementation that provides thread-safe operations for high-performance, scalable handling of elements in a FIFO (First-In-First-Out) manner. It is part of the java.util.concurrent package and is designed for scenarios where multiple threads need to access a queue concurrently without explicit synchronization. The syntax for creating a ConcurrentLinkedQueue is

java.util.concurrent.ConcurrentHashMap is a part of the Java Concurrency package and is designed for highly concurrent applications. It is an advanced version of HashMap that allows safe access and modification by multiple threads without the need for external synchronization. Let’s consider a ConcurrentHashMap<String, Integer> that stores the marks of 5 students: Paani, Mahesh, Datta, Ganesh, and

In Java, Collections.synchronizedMap() is used to create a thread-safe map. It wraps any existing map with synchronization to ensure safe concurrent access by multiple threads. This is particularly useful in scenarios where multiple threads may add, remove, or query elements from the map simultaneously. The syntax for creating a synchronized map is similar to other

In Java, Collections.synchronizedSet() is a method used to create a thread-safe set. It wraps any existing set with synchronization to ensure safe concurrent access by multiple threads. This is particularly useful in scenarios where multiple threads may add, remove, or query elements from the set simultaneously. The syntax for creating a synchronized set is similar

In Java, Collections.synchronizedList() is a method used to create a thread-safe list. This method is part of the java.util.Collections class and ensures that the list can be accessed by multiple threads without causing concurrency issues. This is particularly useful in multi-threaded environments where multiple threads might be adding, removing, or updating elements in a list