If you want to learn 'Java Design Patterns' in less time without missing any concept, you are at the right place. Moreover, if you want to appear in a Java interview, go through this article once. Additionally, If you want to have a quick revision of your concepts on Java Design Patterns which you had learnt a log time before, then also you are at the right place. However, if you are looking for one liner definition of each Design Pattern to memorize them, then also you are at the right place. Then, visit the last section of this article (Design Pattern's Cheat Sheet). In this article, we will discuss about all GoF (Gang of Four) design patterns. The 23 design