The Singleton Pattern: Java Design Patterns Part 10
Channel: Cave of Programming
Date: 2013-02-27

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The singleton pattern is a way of allowing only one object of a particular class in your program, and making that object global. Since any part of your program can then access that object, the singleton pattern can lead to impenetrable code with all the disadvantages of global variables, and so is a little bit controversial. Nevertheless, it's widely used and important to understand.
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