Expect to come across this popular question in java collection interview questions. The collection framework provides all the implementation of the available data structures, which reduces the development time. All the classes are growable classes, that means we don’t need to provide the size at compile time. Later release Collection framework also starts supporting the Generics. Collection framework also starts supporting the thread collection class like ConcurrentHashMap and CopyOnWriteArrayList. Code quality also getting improved by using well-tested collection API. Reduce code maintenance by using the collection framework. Collection API also provides the utility class called Collections. Enhance the reusability and interpretability of the code base.