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Case study java

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JAVA & J2EE
1
JAVA
Abstraction: Showing the essential and hiding the non-Essential is known as Abstraction.
Encapsulation: The Wrapping up of data and functions into a single unit is known as
Encapsulation.
Encapsulation is the term given to the process of hiding the implementation details of the
object. Once an object is encapsulated, its implementation details are not immediately
accessible any more. Instead they are packaged and are only indirectly accessed via the
interface of the object.
Inheritance: is the Process by which the Objects of one class acquires the properties of
Objects another Class.
A reference variable of a Super Class can be assign to any Sub class derived from the Super
class.
Inheritance is the method of creating the new class based on already existing class ,
the new class derived is called Sub class which has all the features of existing class and its
own, i.e sub class.
Adv: Reusability of code , accessibility of variables and methods of the Base class by the
Derived class.
Polymorphism: The ability to take more that one form, it supports Method Overloading &
Method Overriding.
Method overloading: When a method in a class having the same method name with
different arguments (diff Parameters or Signatures) is said to be Method Overloading. This is
Compile time Polymorphism.
o Using one identifier to refer to multiple items in the same scope.
Method Overriding: When a method in a Class having same method name with same
arguments is said to be Method overriding. This is Run time Polymorphism.
o Providing a different implementation of a method in a subclass of the class that originally
defined the method.
1. In Over loading there is a relationship between the methods available in the same class
,where as in Over riding there is relationship between the Super class method and Sub class
method.
2. Overloading does not block the Inheritance from the Super class , Where as in Overriding
blocks Inheritance from the Super Class.
3. In Overloading separate methods share the same name, where as in Overriding Sub class
method replaces the Super Class.
4. Overloading must have different method Signatures , Where as Overriding methods must
have same Signatures.
Dynamic dispatch: is a mechanism by which a call to Overridden function is resolved at
runtime rather than at Compile time , and this is how Java implements Run time
Polymorphism.
Dynamic Binding: Means the code associated with the given procedure call is not known until
the time of call the call at run time. (it is associated with Inheritance & Polymorphism).
Bite code: Is a optimized set of instructions designed to be executed by Java-run time system,
which is called the Java Virtual machine (JVM), i.e. in its standard form, the JVM is an
Interpreter for byte code.
JIT- is a compiler for Byte code, The JIT-Complier is part of the JVM, it complies byte code
into executable code in real time, piece-by-piece on demand basis.
Final classes : String, Integer
Abstract class : Generic servlet
o variable:An item of data named by an identifier.Each variable has a type,such as int or
Object,andascope

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JAVA & J2EE
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o class variable :A data item associated with a particular class as a whole--not with particular
instances of the class. Class variables are defined in class definitions. Also called a static field.
See also instance variable.
o instance variable :Any item of data that is associated with a particular object. Each instance
of a class has its own copy of the instance variables defined in the class. Also called a field. See
also class variable.
o local variable :A data item known within a block, but inaccessible to code outside the block.
For example, any variable defined within a method is a local variable and can't be used outside
the method.
o class method :A method that is invoked without reference to a particular object. Class
methods affect the class as a whole, not a particular instance of the class. Also called a static
method. See also instance method.
o instance method :Any method that is invoked with respect to an instance of a class. Also
called simply a method. See also class method.

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 JAVA Abstraction: Showing the essential and hiding the non-Essential is known as Abstraction. Encapsulation: The Wrapping up of data and functions into a single unit is known as Encapsulation. Encapsulation is the term given to the process of hiding the implementation details of the object. Once an object is encapsulated, its implementation details are not immediately accessible any more. Instead they are packaged and are only indirectly accessed via the interface of the object. Inheritance: is the Process by which the Objects of one class acquires the properties of Objects another Class. A reference variable of a Super Class can be assign to any Sub class derived from the Super class. Inheritance is the method of creating the new class based on already existing class , the new class derived is called Sub class which has all the features of existing class and its own, i.e sub class. Adv: Reusability of code , accessibility of variables and methods of the Base class by the Derived class. Polymorphism: The ability to take more that one form, it supports Method Overloading & Method Overriding. Method overloading: When a method in a class having the same method name with different arguments (diff Parameters or Signatures) is said to be Method Overloading. This is Compile time Polymorphism. Using one identifier to refer to multiple items in the same scope. Method Overriding: When a method in a Class havin ...
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