:(OOP

• Generics


  Parameterized types that allow type (Integer, String, etc. and user-defined types) to be a parameter to methods, classes, and interfaces
• Generic entity


  Class, interface, or method that operates on a parameterized type
• Object is the superclass of all other classes
• Introduced Java Generics


  JDK 5.0
• Purpose of Java Generics

  Reducing bugs and adding an extra layer of abstraction over types
• When to use Generics

  • When you want to create classes or methods that can operate with any data type while maintaining type safety
  • When you want to avoid code duplication by writing reusable components that work with different data types
  • When working with collections to ensure type safety and prevent runtime errors
  • When designing APIs or libraries that need to be flexible and adaptable to different data types
• Code Reuse


  Write a method/class/interface once and use it for any type we want, write code that will work with different types of data
• Type Safety


  Generics make errors appear at compile time rather than at run time
• Type Parameters <T>


  Type parameters, also known as type variables, are used as placeholders to indicate that a type will be assigned to the class at runtime
• Common Type Parameter Names


  • E - Element
  • K - Key
  • N - Number
  • T - Type
  • V - Value
  • S, U, V, and so on: Second, third, and fourth types in a multiparameter situation
• You cannot use Primitive Data Types like int, double, float, char etc. You must use a wrapper class.