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Get the Key for a Value from a Java Map 1. Introduction In this quick tutorial, we’re going to demonstrate three different approaches for retrieving the key from a map for a given value. We’ll also discuss the positives and negatives of the various solutions. To learn more about the Map interface, you… Continue Reading java-map-key-from-value
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A Guide to ConcurrentMap 1. Overview Maps are naturally one of the most widely style of Java collection. And, importantly, HashMap is not a thread-safe implementation, while Hashtable does provide thread-safety by synchronizing operations. Even though Hashtable is thread safe, it is not very efficient. Another fully synchronized Map, Collections.synchronizedMap,… Continue Reading java-concurrent-map
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Comparing Two HashMaps in Java 1. Overview In this tutorial, we’re going to explore different ways to compare two HashMaps in Java. We’ll discuss multiple ways to check if two HashMaps are similar. We’ll also use Java 8 Stream API and Guava to get the detailed differences between different HashMaps.… Continue Reading java-compare-hashmaps
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An Introduction to Synchronized Java Collections 1. Overview The collections framework is a key component of Java. It provides an extensive number of interfaces and implementations, which allows us to create and manipulate different types of collections in a straightforward manner. Although using plain unsynchronized collections is simple overall, it… Continue Reading java-synchronized-collections
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A Guide to TreeMap in Java 1. Overview In this article, we are going to explore TreeMap implementation of Map interface from Java Collections Framework(JCF). TreeMap is a map implementation that keeps its entries sorted according to the natural ordering of its keys or better still using a comparator if… Continue Reading java-treemap
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Guide to the ConcurrentSkipListMap 1. Overview In this quick article, we’ll be looking at the ConcurrentSkipListMap class from the java.util.concurrent package. This construct allows us to create thread-safe logic in a lock-free way. It’s ideal for problems when we want to make an immutable snapshot of the data while other… Continue Reading java-concurrent-skip-list-map
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Convert a Map to an Array, List or Set in Java 1. Overview This short article will show how to convert the values of a Map to an Array, a List or a Set using plain Java as well as a quick Guava based example. This article is part of… Continue Reading convert-map-values-to-array-list-set
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Guide to Apache Commons MultiValuedMap 1. Overview In this quick tutorial, we’ll have a look at the MultiValuedMap interface provided in the Apache Commons Collections library. MultiValuedMap provides a simple API for mapping each key to a collection of values in Java. It’s the successor to org.apache.commons.collections4.MultiMap, which was deprecated in Commons Collection 4.1. 2. Maven… Continue Reading apache-commons-multi-valued-map
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Combining Different Types of Collections in Java 1. Introduction In this quick tutorial, we’ll explore different ways of combining collections in Java. We’ll explore various approaches using Java and external frameworks like Guava, Apache, etc. For the introduction to Collections, have a look at this series here. 2. External Libraries… Continue Reading java-combine-collections
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A Guide to LinkedHashMap in Java 1. Overview In this article, we are going to explore the internal implementation of LinkedHashMap class. LinkedHashMap is a common implementation of Map interface. This particular implementation is a subclass of HashMap and therefore shares the core building blocks of the HashMap implementation. As… Continue Reading java-linked-hashmap
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