https://aamernabi.github.io/tags/java8/ Recent content in Java8 on Aamer Paul Hugo en-us Tue, 26 Mar 2024 21:25:32 +0530 https://aamernabi.github.io/posts/java-functional-interface/ Tue, 26 Mar 2024 21:25:32 +0530 https://aamernabi.github.io/posts/java-functional-interface/ <p>A <strong>functional interface</strong> in Java is an interface that contains exactly one abstract method. Introduced in Java 8, they are the backbone of lambda expressions and the Stream API, enabling a more functional style of programming. They are also known as <strong>Single Abstract Method (SAM)</strong> interfaces.</p> <p>To ensure an interface is a functional interface, you can use the <code>@FunctionalInterface</code> annotation. The compiler will then trigger an error if the interface does not meet the requirements.</p> https://aamernabi.github.io/posts/deep-dive-into-java-stream-api/ Mon, 07 Jun 2021 18:12:23 +0530 https://aamernabi.github.io/posts/deep-dive-into-java-stream-api/ <p>The <strong>Stream API</strong>, introduced in Java 8, is a powerful tool for processing sequences of elements. It provides a functional approach to working with collections and arrays, allowing for expressive and efficient data manipulation. Streams don&rsquo;t store data; instead, they operate on a data source, such as a <code>Collection</code> or an array, and enable aggregate operations.</p> <h2 id="core-concepts">Core Concepts</h2> <p>A stream pipeline consists of three parts:</p> <ol> <li><strong>A source</strong>: Where the stream originates from (e.g., a <code>List</code>, <code>Set</code>, or array).</li> <li><strong>Zero or more intermediate operations</strong>: These transform the stream into another stream. Examples include <code>filter</code>, <code>map</code>, and <code>sorted</code>.</li> <li><strong>A terminal operation</strong>: This produces a result or a side-effect, and triggers the execution of the pipeline. Examples include <code>forEach</code>, <code>collect</code>, and <code>reduce</code>.</li> </ol> <p>One of the key features of streams is <strong>laziness</strong>. Intermediate operations are not executed until a terminal operation is invoked. This allows the Stream API to optimize the execution of the pipeline.</p> https://aamernabi.github.io/posts/java-completable-future/ Mon, 27 Jul 2020 12:09:10 +0530 https://aamernabi.github.io/posts/java-completable-future/ <p>Introduced in Java 8, <code>CompletableFuture</code> is a powerful class for asynchronous programming. It extends the traditional <code>Future</code> interface with a rich set of features for composing, combining, and handling asynchronous tasks, enabling you to write non-blocking, highly concurrent applications with ease.</p> <h2 id="why-completablefuture">Why <code>CompletableFuture</code>?</h2> <p>Before <code>CompletableFuture</code>, Java&rsquo;s <code>Future</code> was limited. You could start an asynchronous task, but you had to block your main thread using <code>get()</code> to retrieve the result. This defeated the purpose of non-blocking code.</p>