What are the main concepts of OOPs:<\/h3>\n\n- \nClass:<\/strong>– A class is the core of Object-Oriented Programming language. It consists of data and functions. It is mandatory to create class in OOPs.
\n
\nClass Employee
\n{
\n Public void addemployee()[Function for adding employee details]\n{
\nString name = \u201cabc\u201d;
\nInt empid = 101;
\n}
\n}
\n<\/code>\n<\/li>\n- \nObject:<\/strong>– Object is the run time entity of the class. We can access the class data of functions by creating an object of that class.
\n
\nEmployee objEmp = new Employee();
\n<\/code>\n<\/li>\n<\/p>\n
- \nAbstraction:<\/strong>– Abstraction is the concept of hiding. It means we show the user What we do<\/strong> not How we do it<\/strong>. We can achieve abstraction by placing the abstract keyword in front of the class name.
\n
\nabstract class MobilePhone {
\n public void Calling();
\n public void SendSMS();
\n}
\n<\/code>
\nFew of the properties of the abstract class are:<\/p>\n\n- Objects of the Abstract class can not be created.<\/li>\n
- It can have both abstract and non-abstract methods<\/li>\n
- It can have both constructors and static methods<\/li>\n
- We must override all the abstract methods of the abstract class in the child class.<\/li>\n<\/ol>\n<\/li>\n
- Encapsulation:<\/strong>
\nWrapping up the data and functioning together is known as Encapsulation.
\nWe can achieve encapsulation by declaring all the variables in the class as private and using properties to get and set those variables.\n<\/li>\n- Polymorphism:<\/strong>
\nPolymorphism means one name and many forms. It provides an ability to have multiple implementations with the same name in a class.
\nThere are 2 types of Polymorphism –<\/p>\n\n- Static \/ Compile Time Polymorphism<\/li>\n
- Dynamic \/ Runtime Polymorphism<\/li>\n<\/ol>\n
![\"polymorphism\"\/](\"https:\/\/studysection.com\/blog\/wp-content\/uploads\/2020\/02\/polymorphism.png\")
<\/p>\n<\/li>\n
- Method Overloading<\/strong>:- In this concept, we create multiple functions with the same name and unique signatures and whenever we will call that function the compiler will decide which function to call based on the signature of the function.
\n
\nSyntax -
\npublic int Add(int a, int b, int c)
\n {
\n return a + b + c;
\n }
\n public int Add(int a, int b)
\n {
\n return a + b;
\n }
\n<\/code>\n<\/li>\n- Operator Overloading:<\/strong>
\nIt gives the ability to use the same operator for various operations.
\n
\nSyntax -
\naccess specifier className operator Operator_symbol (parameters)
\n{
\n \/\/ Code
\n}
\n<\/code>\n<\/li>\n- Method Overriding:<\/strong>
\nIn method overriding we define the function with the same name and signature in the child class.<\/li>\n- Inheritance:<\/strong>
\nIt is a concept of reusing the already written code. We can inherit the code of the superclass and use it again in the child class.<\/p>\nImportant terminology:<\/strong><\/p>\n\n- Super Class – A class whose features are inherited is called a superclass.<\/li>\n
- Child Class – A class that is inheriting the superclass is known as child class.<\/li>\n<\/ul>\n
\nSyntax:
\nclass derived-class : base-class
\n{
\n \/\/ methods and fields
\n}
\n<\/code><\/p>\nTypes of Inheritance:<\/strong><\/h3>\n
\n
\nClass Employee
\n{
\n Public void addemployee()[Function for adding employee details]\n{
\nString name = \u201cabc\u201d;
\nInt empid = 101;
\n}
\n}
\n<\/code>\n<\/li>\n- \nObject:<\/strong>– Object is the run time entity of the class. We can access the class data of functions by creating an object of that class.
\n
\nEmployee objEmp = new Employee();
\n<\/code>\n<\/li>\n<\/p>\n
- \nAbstraction:<\/strong>– Abstraction is the concept of hiding. It means we show the user What we do<\/strong> not How we do it<\/strong>. We can achieve abstraction by placing the abstract keyword in front of the class name.
\n
\nabstract class MobilePhone {
\n public void Calling();
\n public void SendSMS();
\n}
\n<\/code>
\nFew of the properties of the abstract class are:<\/p>\n\n- Objects of the Abstract class can not be created.<\/li>\n
- It can have both abstract and non-abstract methods<\/li>\n
- It can have both constructors and static methods<\/li>\n
- We must override all the abstract methods of the abstract class in the child class.<\/li>\n<\/ol>\n<\/li>\n
- Encapsulation:<\/strong>
\nWrapping up the data and functioning together is known as Encapsulation.
\nWe can achieve encapsulation by declaring all the variables in the class as private and using properties to get and set those variables.\n<\/li>\n- Polymorphism:<\/strong>
\nPolymorphism means one name and many forms. It provides an ability to have multiple implementations with the same name in a class.
\nThere are 2 types of Polymorphism –<\/p>\n\n- Static \/ Compile Time Polymorphism<\/li>\n
- Dynamic \/ Runtime Polymorphism<\/li>\n<\/ol>\n
<\/p>\n<\/li>\n
- Method Overloading<\/strong>:- In this concept, we create multiple functions with the same name and unique signatures and whenever we will call that function the compiler will decide which function to call based on the signature of the function.
\n
\nSyntax -
\npublic int Add(int a, int b, int c)
\n {
\n return a + b + c;
\n }
\n public int Add(int a, int b)
\n {
\n return a + b;
\n }
\n<\/code>\n<\/li>\n- Operator Overloading:<\/strong>
\nIt gives the ability to use the same operator for various operations.
\n
\nSyntax -
\naccess specifier className operator Operator_symbol (parameters)
\n{
\n \/\/ Code
\n}
\n<\/code>\n<\/li>\n- Method Overriding:<\/strong>
\nIn method overriding we define the function with the same name and signature in the child class.<\/li>\n- Inheritance:<\/strong>
\nIt is a concept of reusing the already written code. We can inherit the code of the superclass and use it again in the child class.<\/p>\nImportant terminology:<\/strong><\/p>\n\n- Super Class – A class whose features are inherited is called a superclass.<\/li>\n
- Child Class – A class that is inheriting the superclass is known as child class.<\/li>\n<\/ul>\n
\nSyntax:
\nclass derived-class : base-class
\n{
\n \/\/ methods and fields
\n}
\n<\/code><\/p>\nTypes of Inheritance:<\/strong><\/h3>\n