int size() : Get the size of Collection.Some other common operations possible with Collection are: List newList = new ArrayList(newCollection) We do the conversion by passing the newCollection: Now let's assume we need in the ArrayList form to perform List specific operations on it. For example, it provides a constructor for each Data Structure to work with the generic collection and perform conversions.Īssume we define a generic collection that holds String objects. The collections interface makes it easier to pass around the above-mentioned collection of objects as needed. The Collection Interface declares a bunch of utility methods common across all the Java Data Structures implementing it example ArrayList, HashSet and others. ![]() ![]() Java Collections Framework - Interfaces and Implementations The figure below gives a high-level overview of the Collections Framework implementation in Java. A container that can hold data in some format, you can retrieve it in different ways, and perform operations on that data depending on the type of container. Similarly in Java, you can think of a Collection as a means to store your data. In layman terms, a Collection represents a group of objects. As an experienced Software Engineer, I cannot imagine a day without having used the Java Collections API. One of the main libraries that come built-in with the JDK is the Java Collections Framework. Java might be a verbose language but it is one of the most mature programming languages of all time. ![]() Out of which I spent 4 years building college projects and 3+ years building Enterprise-grade applications at my full-time job. Java has been my primary programming language for almost 7+ years now.
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