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This document discusses the differences between procedural and object-oriented programming. Procedural programming focuses on functions while object-oriented programming focuses on classes and the methods within them. Object-oriented programming combines data and operations, whereas procedural programming separates them. A class defines the variables and methods that objects of that class will have. An object is an instance of a class, and has the data and behaviors defined by its class. A class can contain fields to store data, methods to manipulate the data, and nested classes and interfaces. An example Pencil class is provided with fields to store attributes and a method to set the color.

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Lecture 2: Object Oriented Programming I
Procedural vs. Object-Oriented Programming  The unit in procedural programming is function, and unit in object-oriented programming is class  Procedural programming concentrates on creating functions, while object-oriented programming starts from isolating the classes, and then look for the methods inside them.  Procedural programming separates the data of the program from the operations that manipulate the data, while object-oriented programming focus on both of them figure1: procedural figure2: object-oriented
Concept of Class and Object  β€œClass” refers to a blueprint. It defines the variables and methods the objects support  β€œObject” is an instance of a class. Each object has a class which defines its data and behavior
Class Members A class can have three kinds of members: ο‚‘ fields: data variables which determine the status of the class or an object ο‚‘ methods: executable code of the class built from statements. It allows us to manipulate/change the status of an object or access the value of the data member ο‚‘ nested classes and nested interfaces
Sample class class Pencil { public String color = β€œred”; public int length; public float diameter; public static long nextID = 0; public void setColor (String newColor) { color = newColor; } }
Sample class class Pencil { public String color = β€œred”; public int length; public float diameter; public static long nextID = 0; public void setColor (String newColor) { color = newColor; } }

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  • 2. Procedural vs. Object-Oriented Programming  The unit in procedural programming is function, and unit in object-oriented programming is class  Procedural programming concentrates on creating functions, while object-oriented programming starts from isolating the classes, and then look for the methods inside them.  Procedural programming separates the data of the program from the operations that manipulate the data, while object-oriented programming focus on both of them figure1: procedural figure2: object-oriented
  • 3. Concept of Class and Object  β€œClass” refers to a blueprint. It defines the variables and methods the objects support  β€œObject” is an instance of a class. Each object has a class which defines its data and behavior
  • 4. Class Members A class can have three kinds of members: ο‚‘ fields: data variables which determine the status of the class or an object ο‚‘ methods: executable code of the class built from statements. It allows us to manipulate/change the status of an object or access the value of the data member ο‚‘ nested classes and nested interfaces
  • 5. Sample class class Pencil { public String color = β€œred”; public int length; public float diameter; public static long nextID = 0; public void setColor (String newColor) { color = newColor; } }
  • 6. Sample class class Pencil { public String color = β€œred”; public int length; public float diameter; public static long nextID = 0; public void setColor (String newColor) { color = newColor; } }