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Introduction to RxJava Observable

Introduction: RxJava is a popular reactive programming library that brings the concept of Observables and Observers to the Java language. Observables are an essential component of RxJava, allowing developers to work with asynchronous and event-based programming in a more elegant and manageable way. In this blog post, we will explore the basics of RxJava Observable and how it can be used.

What is an Observable? In RxJava, an Observable represents a stream of data or events that can be observed and processed by Observers. It acts as a data source that emits items(events) over time. Observables can emit different types of items, such as integers, strings, objects, or even custom data types. Observers can subscribe to an Observable and receive these emitted items, performing operations on them as needed.

Creating an Observable: RxJava provides various ways to create Observables. Here are a few common methods:

1. Create: The Observable.create() method allows you to manually create an Observable. Within the create() method, you define the logic for emitting items to the Observers. For example:

Observable<String> observable = Observable.create(emitter -> {
    emitter.onNext("Hello");
    emitter.onNext("World");
    emitter.onComplete();
});