1 Chapter 10 Numbers and Statics • Static method and Variables • Wrapper Class Two types of methods. • Instance methods: associated with an object and use the instance variables of that object. • Static methods (also called class methods ): use no instance variables of any object of the class they are defined in. public static double mean(int p) Static methods can be invoked through the class name. Why declare a method static • Documentation . Anyone seeing that a method is static will know how to call it. • Efficiency . A compiler will usually produce slightly more efficient code because no implicit object parameter has to be passed to the method.