Java OOPs Concepts - Javatpoint. In this page, we will learn about basics of OOPs. Object Oriented Programming is a paradigm that provides many concepts such as inheritance, data binding, polymorphism etc. Simula is considered as the first object- oriented programming language. The programming paradigm where everything is represented as an object, is known as truly object- oriented programming language. Smalltalk is considered as the first truly object- oriented programming language. OOPs (Object Oriented Programming System)Object means a real word entity such as pen, chair, table etc. It simplifies the software development and maintenance by providing some concepts: Object. Class. Inheritance. Polymorphism. Abstraction. Encapsulation. Object. Any entity that has state and behavior is known as an object. For example: chair, pen, table, keyboard, bike etc. It can be physical and logical. Class. Collection of objects is called class. It is a logical entity. Inheritance. When one object acquires all the properties and behaviours of parent object i. It provides code reusability. It is used to achieve runtime polymorphism. Polymorphism. When one task is performed by different ways i. For example: to convince the customer differently, to draw something e. Core Java – Tutorials with examples; OOPs Concepts – OOPs in Java; Java Collections – Framework tutorials; JSP – Tutorial for beginners; OOPs concepts in Java. In java, we use method overloading and method overriding to achieve polymorphism. Another example can be to speak something e. For example: phone call, we don't know the internal processing. In java, we use abstract class and interface to achieve abstraction. Encapsulation. Binding (or wrapping) code and data together into a single unit is known as encapsulation. For example: capsule, it is wrapped with different medicines. A java class is the example of encapsulation. Introduction to Object-Oriented Programming. Concept Concept Concept Concept decomposition Concept Concept Concept Concept aggregation. OOP: Introduction 14 Aggregation and Decomposition, Example. Basic OOP Concepts Introduction Goal of OOP: Reduce complexity of software development by keeping details, and especially changes to details, from spreading throughout the entire program. This presentation assumes 'Basic Class. Java bean is the fully encapsulated class because all the data members are private here. Advantage of OOPs over Procedure- oriented programming language. OOPs makes development and maintenance easier where as in Procedure- oriented programming language it is not easy to manage if code grows as project size grows. We can provide the solution of real word problem if we are using the Object- Oriented Programming language. What is difference between object- oriented programming language and object- based programming language?
Object based programming language follows all the features of OOPs except Inheritance. Java. Script and VBScript are examples of object based programming languages. Do You Know ? Can we overload main method ? Constructor returns a value but, what ? Can we create a program without main method ? What are the 6 ways to use this keyword ? Why multiple inheritance is not supported in java ? Why use aggregation ? Can we override the static method ? What is covariant return type ? What are the three usage of super keyword? Why use instance initializer block? What is the usage of blank final variable ? What is marker or tagged interface ? What is runtime polymorphism or dynamic method dispatch ? What is the difference between static and dynamic binding ? How downcasting is possible in java ? What is the purpose of private constructor? What is object cloning ? What we will learn in OOPs Concepts ? Advantage of OOPs. Naming Convention. Object and class. Method overloading. Constructorstatic keywordthis keyword with 6 usage. Inheritance. Aggregation. Method Overriding. Covariant Return Typesuper keyword. Instance Initializer blockfinal keyword. Abstract class. Interface. Runtime Polymorphism. Static and Dynamic Binding. Downcasting with instanceof operator. Package. Access Modifiers. Encapsulation. Object Cloning.
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