The Fission Theory: This theory proposes that the Moon was once part of the Earth and somehow separated from the Earth early in the history of the solar system.
This provides modular approach to programming. Classes. A class is a concept used in object oriented programming languages such as C++, PHP, and JAVA etc. Apart from holding data, a class is also used to hold functions. An object is an instant of a class. In case of variables, the type is the class whereas the variable is the object.
Methods. 1  Methods do not have independent existence they are always defined with in class. 2  Methods are defined in object oriented languages like C#, Java. 3  Methods are called using instance or object. 4  Methods are used to manipuate instance variable of a class.