In terms of programming we can define object as a self-contained component that contain property and methods needed to make a certain type of data useful. Objects are the things you think about first before designing the program and they are also the unit of the code that derived from the process. As well as objects are made into generic class of object that can share model and reuse of classes in code.
In programming we can define classes as a template definition of methods and variables in particular kind of object. Object is a specific instance of a class that contain real value instead of variables. We can define class in different aspects of programming. A class may contain subclasses that can inherit some or all the characteristics of the parent class and subclasses can also define their own functions and variables that are not the part of parent class. So the structure of parent class and its child class is known as hierarchy. There is no need of class if they can't reused couple of functions. When the functions are grow in the program then the concept of classes comes into existence.
In the field of Object-oriented programming method is a programmed procedure which define in the class including some of the objects of the class. So a class can have more than one method. We can also define objects in method that have only access to the data known to that object that ensure the integrity of the data among the set of objects in any application that can be used in multiple objects.
In programming function is a named procedure that perform some of the distinct service. There are language statements in the function that request for the function known as function call. As we know programming languages usually comes with compiler and set of canned functions that programmer can specify by writing language statement. If we talk about functions in hardware then it is a complete physical movement that have some consequences relative to devices purpose. Let’s take a printer example that might be a carriage return or line feed.