CS8651 IP Notes

Anna University Regulation 2017 CSE CS8651 IP Notes, INTERNET PROGRAMMING Lecture Handwritten Notes for all 5 units are provided below. Download link for CSE 6th Sem INTERNET PROGRAMMING Notes are listed down for students to make perfect utilization and score maximum marks with our study materials.


Introduction to java
Java is an Object-Oriented Language. As a language that has the Object Oriented feature, Java supports the following fundamental concepts: Polymorphism Inheritance Encapsulation Abstraction Classes Objects Instance Method Message Parsing
In this chapter, we will look into the concepts Classes and Objects. Object – Objects have states and behaviors. Example: A dog has states – color, name, breed as well as behaviors -wagging, barking, eating. An object is an instance of a class. Class – A class can be defined as a template/blue print that describes the behaviors/states that object of its type support.
Objects in Java:
Let us now look deep into what are objects. If we consider the real-world we can find many objects around us, Cars, Dogs, Humans, etc. All these objects have a state and behavior.
If we consider a dog, then its state is – name, breed, color, and the behavior is – barking, wagging, running
If you compare the software object with a real world object, they have very similar characteristics.
Software objects also have a state and behavior. A software object’s state is stored in fields and behavior is shown via methods.
So in software development, methods operate on the internal state of an object and the object-to-object communication is done via methods.
Classes in Java:
A class is a blue print from which individual objects are created.

class can contain any of the following variable types. Local variables: Variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and the variable will be destroyed when the method has completed. Instance variables: Instance variables are variables within a class but outside any method. These variables are instantiated when the class is loaded. Instance variables can be accessed from inside any method, constructor or blocks of that particular class. Class variables: Class variables are variables declared with in a class, outside any method, with the static keyword.
A class can have any number of methods to access the value of various kinds of methods. In the above example, barking(), hungry() and sleeping() are methods.
Below mentioned are some of the important topics that need to be discussed when looking into classes of the Java Language.
When discussing about classes, one of the most important sub topic would be constructors. Every class has a constructor. If we do not explicitly write a constructor for a class the Java compiler builds a default constructor for that class.
Each time a new object is created, at least one constructor will be invoked. The main rule of constructors is that they should have the same name as the class. A class can have more than one constructor.

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