Moreover, since Generics eliminates the need to use casting and instanceof function, it makes the code clean and precise. Thus, by showing an error during the compilation, it helps prevent ClassCastException at runtime. If you try to add an element of a different type, Generics will display a compile-time error. Generics lets you specify or define the type of objects that a collection can store. What is the role of Generics in the Collections framework? While arrays do not offer ready-to-use methods (searching, sorting, insertion, etc.) for user requirements, collections always include ready-to-use methods.ģ.An array can only store homogeneous (similar or same) objects, whereas a collection can store a heterogeneous group of objects.However, you can alter a collection’s size according to your scaling needs. You cannot increase or decrease the length of an array according to your runtime requirements – arrays are fixed in size.Distinguish between Array and Collection.Īlthough array and collection are used for storing objects and manipulating data, they have a few innate differences: The collection classes shipped with JDK reduces the efforts required for code maintenance.Ģ. The usage of core collection classes substantially reduces the development effort and time. It facilitates code reusability and interoperability. Here are a few benefits of the Java Collections framework: Also, it comes equipped with blocking interfaces along with their implementations in Java concurrent packages. Java Collections includes both Generics and Concurrent collection classes for thread-safe operations. What is the advantage of using the Collections framework? Java Collections Interview Questions & Answersġ.
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