The document provides an overview of key Object-Oriented Programming (OOP) concepts including classes, objects, abstraction, inheritance, interfaces, polymorphism, and encapsulation. It explains that classes are logical entities containing sets of objects, while objects are real-time entities identified by their identity, state, and behavior. Additionally, it discusses inheritance as a way to derive new classes from existing ones, and encapsulation as the process of wrapping code and data together.

1. JAVA
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2. OOPS
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3. OOPS
▪ Class
▪ Object
▪ Abstraction
▪ Inheritance
▪ Interface
▪ Encapsulation
▪ Polymorphism
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Identity
State
Behavior

4. Class
▪ Class is logical entity
▪ Class contain set of objects or collection of objects
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5. Objects
▪ Objects are real time entity
▪ Identify the object by its
▪ Identity
▪ State
▪ Behavior
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6. Abstraction
▪ The general meaning for abstraction is ELIMINATION i.e fetching
only the wanted information even though all information is
available based on our need we are eliminating the unwanted
information.
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7. Inheritance
▪ When one Class extends another Class. Deriving new class from the
existing class parent child relationship
Two types
▪ Single level
▪ Multi level
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8. Cont..
Single level
Deriving a new class from the existing class(one to one)
Example
class A
{
}
class B extends class A
{
}
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9. Cont..
Multi Level
Deriving multilevel of new class from the parent
Example
class A{
}
class B extends class A {
}
class C extends class B{
}
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10. Interface
▪ Replacement of multiple inheritance that has methods and method
definition and no implementation
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11. Polymorphism
▪ The general meaning for POLY — many MORPHISM — behavior.
Two types of polymorphism.
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12. Encapsulation
▪ Encapsulation is a process of wrapping code and data together into
a single unit e.g. capsule i.e mixed of several medicines.
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