Optional in collections

Sometime it is argued that the type Optional is worth being used in collections. It allegedly solves the problem of…

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Consuming java.util.concurrent.BlockingQueue as rx.Observable

Classical producer-consumer pattern is relatively simple in Java since we have java.util.concurrent.BlockingQueue. To avoid busy waiting and error-prone manual locking…

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Transforming Collections

Did you ever want to substitute the equals and hashCode methods a HashSet or HashMap uses? Or have a List…

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Simple benchmarking : Immutable Collections VS Persistent Collections

Often you need to add new elements to a collection. Because you are a good and careful developer you want…

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How to Use Java 8 Streams to Swiftly Replace Elements in a List

Imagine you have a list of items: List<String> books = Arrays.asList( "The Holy Cow: The Bovine Testament", "True Hip Hop",…

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Transforming Collections with Decorators

The Decorator Pattern Ever since first learning the programming design patterns, the decorator pattern has been my favorite. It seemed…

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Stream-Powered Collections Functionality in JDK 8

This post presents application of JDK 8 – introduced Streams with Collections to more concisely accomplish commonly desired Collections-related functionality.…

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How to use CopyOnWriteArraySet in Java with Example

CopyOnWriteArraySet is little brother of CopyOnWriteArrayList class. These are special purpose collection classes which was added on JDK 1.5, along…

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Code4ReferenceList Recently Used(LRU) implementation using LinkedHashMap

Recently I stumbled on one of the Java interview questions: “Implement List-Recently-Used (LRU) Cache using Java collection class?” If you…

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