Understanding the basic design patterns of the Java world

All GoF patterns have a good purpose and solve major problems of object-oriented design, but some patterns are most commonly used in the Java and Java EE ecosystem. In this book, these patterns are treated as basic design patterns because they are most commonly used to implement solutions on Java's APIs, frameworks, and algorithms. Consequently, understanding these patterns will help us to understand these APIs, frameworks, and algorithms, and we'll, in turn, be able to create a better solution using Java. These patterns are Singleton, Abstract Factory, Facade, Iterator, and Proxy.