Category: Java

Posted on: January 21, 2025 Posted by: rahulgite Comments: 0

Notes on volatile in Java

The volatile keyword in Java is used as a lightweight synchronization mechanism for variables shared between threads. It ensures visibility and ordering guarantees for multithreaded applications. Key Features of volatile: Syntax: Use Cases: Example of Visibility Problem Without volatile: Fixed With volatile: Limitations of volatile: Key Points to Remember: Summary: The volatile keyword is a simple yet powerful tool for ensuring visibility and ordering in multithreaded Java applications. While it…

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Posted on: January 21, 2025 Posted by: rahulgite Comments: 0

Context-Specific Deserialization Filters in Java

Context-Specific Deserialization Filters were introduced in Java 9 to enhance security during object deserialization. These filters allow developers to define custom rules for controlling and restricting the deserialization of objects, helping to prevent vulnerabilities such as deserialization attacks. What Are Context-Specific Deserialization Filters? Key Features Example: Basic Usage Code: Explanation of the Example Updates in Java 17 Java 17 introduced enhancements to deserialization filtering to simplify configuration and strengthen security:…

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Posted on: January 21, 2025 Posted by: rahulgite Comments: 0

Garbage Collectors in Java: An Overview

Java provides several garbage collection (GC) algorithms, each designed to optimize memory management for specific application requirements. This document explores the major garbage collectors available in Java, their features, algorithms (detailed), use cases, configurations, and default settings in modern Java versions. Key Concepts: Young Generation, Old Generation, Eden, Survivor, and Old Regions 1. Young Generation: 2. Old Generation: 3. Eden Region: 4. Survivor Regions: 5. Old Region: 1. Serial Garbage…

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Posted on: January 21, 2025 Posted by: rahulgite Comments: 0

Deprecation of SecurityManager and Alternatives

The SecurityManager class has been deprecated starting from Java 17 and is expected to be completely removed in future Java releases. Its deprecation stems from its outdated security model and its inability to address modern application security requirements effectively. Below, we explore why it was deprecated, the associated issues, and the recommended alternatives. Why SecurityManager Was Deprecated Recommended Alternatives to SecurityManager 1. Java Security Features Modern Java provides other security…

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Posted on: January 21, 2025 Posted by: rahulgite Comments: 0

Deprecated Thread.stop() and Alternatives

The Thread.stop() method was deprecated in Java 1.2 and officially removed in Java 17. It was deemed unsafe for use due to its inherent risks and unpredictability. Below, we explore why it was removed, the associated issues, and the recommended alternatives. Why Thread.stop() Was Removed Recommended Alternatives to Thread.stop() 1. Using a Volatile Flag Use a volatile boolean flag to signal a thread to stop execution gracefully. Example: Output: 2.…

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Posted on: January 21, 2025 Posted by: rahulgite Comments: 0

CompletableFuture in Detail

CompletableFuture is part of Java’s java.util.concurrent package introduced in Java 8. It is a powerful tool for asynchronous programming, allowing non-blocking execution, chaining of tasks, and efficient handling of results and exceptions. Key Features of CompletableFuture Key Methods in CompletableFuture Method Description supplyAsync(Supplier) Executes a Supplier task asynchronously and returns a CompletableFuture. runAsync(Runnable) Executes a Runnable task asynchronously without returning a result. thenApply(Function) Transforms the result of a previous computation.…

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Posted on: January 21, 2025 Posted by: rahulgite Comments: 0

Java Multithreading Frameworks: Detailed Overview

Java provides various frameworks and tools for multithreading and concurrency. Below is an in-depth guide to these frameworks, their features, advantages, disadvantages, Java version introduction, example implementations with explanations, and expected outputs. 1. ExecutorService Framework The ExecutorService simplifies thread management by providing a pool of threads for executing tasks. Key Features: Introduced in: Advantages: Disadvantages: Example: Explanation: Output: 2. Fork/Join Framework Designed for divide-and-conquer tasks, the Fork/Join Framework splits tasks…

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Posted on: January 21, 2025 Posted by: rahulgite Comments: 0

ExecutorService in Java: Overview, Functions, and Examples

The ExecutorService is part of the java.util.concurrent package in Java and provides a powerful framework for managing threads. It simplifies concurrent programming by abstracting the creation, management, and termination of threads. Key Features of ExecutorService Common Methods in ExecutorService 1. execute(Runnable command) Executes a Runnable task asynchronously. Example: 2. submit(Callable<T> task) or submit(Runnable task) Submits a task for execution and returns a Future object. With Callable, you can get a…

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Posted on: January 18, 2025 Posted by: rahulgite Comments: 0

Comparable vs Comparator

Comparable Comparator Key Differences Aspect Comparable Comparator Sorting Sequence Provides a single sorting sequence based on one element (e.g., id, name). Provides multiple sorting sequences based on multiple elements (e.g., id, name, price). Class Modification Affects the original class; the class must implement Comparable. Does not modify the original class; comparison logic can be in a separate class. Method Uses compareTo() method for sorting. Uses compare() method for sorting. Package…

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