本文详细介绍了静态变量的概念，包括其别称、存储位置、生命周期及如何访问。解释了静态变量类似于常量的特点，无论创建多少个对象，每个类仅有一份静态变量副本。
1. Class variable is also known as static variable with "static" keyword inside the class but outside the methods.
2. There is only one copy of class variable is no matter how many objects are initiated from this class.
3. Class variable is accessed as: className.classVariableName.
4. Static variable is pretty like constant, declared with key word "static", stored in static memory, created when program begins and destroyed when program ends.
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