Java Intermediate Tutorials

Created by Rama

👉 Lesson 1 : Recursion
👉 Lesson 2 : Collections And ArrayList
👉 Lesson 3 : LinkedList
👉 Lesson 4 : List to Array
👉 Lesson 5 : Collections sorting and replacing
👉 Lesson 6 : Collections Copy and Fill
👉 Lesson 7 : Frequency and Disjoint
👉 Lesson 8 : Stacks, push, pop
👉 Lesson 9 : Queue
👉 Lesson 10 : HashSet
👉 Lesson 11 : Generic Methods
👉 Lesson 12 : Implementing Generic Methods
👉 Lesson 13 : Generic Return Types
👉 Lesson 14 : Part 1 - Threads
👉 Lesson 14 : Part 2 - Threads Call

Object Oriented Programming

A - Abstraction
P - Polymorphism
I - Inheritance
E - Encapsulation

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####ABSTRACTION

• Focus on essentials/idea rather than specific details/events
• Ignore the irrelevant or unimportant

Abstract Class

• May or may not contain abstract methods (Eg- method without body: public void get(); )
• But, if a class have at least one abstract method, then the class must be declared abstract.
• If a class is declared abstract it cannot be instantiated.
• To use an abstract class you have to inherit it from another class, provide implementations to the abstract methods in it.
• If you inherit an abstract class you have to provide implementations to all the abstract methods in it

👉 Lesson 15 : Abstract Class
A class which extends an abstract class and defines every method in it is called concrete class

Abstract Method

👉 Lesson 16 : Abstract Method

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####POLYMORPHISM

• Many Forms/Behaviour
• It is of two types
  • Static Binding - Compile time polymorphism
    • Eg: Method Overloading
  • Dynamic Binding - Runtime polymorphism
    • Eg: Method Overridding

Method Overloading

• Same Method name
• Different parameter
• Different behavior

👉 Lesson 17 : Method Overloading

Method Overriding

• Same Method name
• Same parameter
• Different class

👉 Lesson 18 : Method Overriding

Constructor Overloading

• Same Constructor
• Different parameter

👉 Lesson 19 : Constructor Overloading

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####INHERITANCE

• Code reuse - efficient method
• One class acquires the properties (methods and fields) of another Class
• extends is the keyword used to inherit the properties of a class

👉 Lesson 20 : Polymorphism

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####ENCAPSULATION

• Process of wrapping code and data together into a single unit
• Variables of a class is hidden from other classes, and can be accessed only through the methods of their current class [Data hiding]
• To achieve encapsulation in Java
  • Declare the variables of a class as private.
  • Provide public setter and getter methods to modify and view the variables values.
• Benefits
  • The fields of a class can be made read-only or write-only
  • It provides you the control over the data

👉 Lesson 21 : Encapsulation

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####INTERFACE

• Collection of abstract methods
• Writing an interface is similar to writing a class. But a class describes the attributes and behaviors of an object. And an interface contains behaviors that a class implements.
• How it varies from a class
  • You cannot instantiate an interface
  • An interface does not contain any constructors
  • All of the methods in an interface are abstract(by default its public abstract)
  • An interface can extend multiple interfaces

👉 Lesson 22 : Interface

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👉 Lesson 23 : Final Keyword

• Example for variable, method and class

👉 Lesson 24 : Anonymous Class and Object

Added Collections tutorial