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lazy-loading/README.md

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+---
+layout: pattern
+title: Lazy Loading
+folder: lazy-loading
+permalink: /patterns/lazy-loading/
+categories: Other
+tags:
+ - Java
+ - Difficulty-Beginner
+ - Idiom
+ - Performance
+---
+
+## Intent
+Lazy loading is a design pattern commonly used to defer
+initialization of an object until the point at which it is needed. It can
+contribute to efficiency in the program's operation if properly and
+appropriately used.
+
+![alt text](./etc/lazy-loading.png "Lazy Loading")
+
+## Applicability
+Use the Lazy Loading idiom when
+
+* eager loading is expensive or the object to be loaded might not be needed at all
+
+## Real world examples
+
+* JPA annotations @OneToOne, @OneToMany, @ManyToOne, @ManyToMany and fetch = FetchType.LAZY
+
+##Credits
+* [J2EE Design Patterns](http://www.amazon.com/J2EE-Design-Patterns-William-Crawford/dp/0596004273/ref=sr_1_2)