Week-1..................................
- 2. Week-1 Agenda Overview of functional programming concepts Lambda expressions Functional interfaces Method References
- 3. Functional Programming Paradigm Functional programming is a programming paradigm in which we try to bind everything in pure mathematical functions style. It is a declarative type of programming style. Its main focus is on “what to solve” in contrast to an imperative style where the main focus is “how to solve”. It uses expressions instead of statements. Java – Object Oriented Programming Java 8 – Functional Programming Let’s c an example
- 4. Java 8 Oracle released a new version of Java as Java 8 in March 18, 2014. It includes various upgrades to the Java programming, JVM, Tools and libraries. Java 8 is the latest release for Java that contains new features, enhancements and bug fixes to improve efficiency to develop and run Java programs. It was a revolutionary release of the Java for software development platform
- 5. Functional Interface: An Interface that contains exactly one abstract method is known as functional interface. It can have any number of default, static methods but can contain only one abstract method. The functional interface is used to support the functional programming approach, lambda expression, and method reference as well.
- 6. Lambda expressions: Lambda expression is also known as an anonymous function. It is designed to provide the implementation of a functional interface. Syntax (list of arguments) -> { expression body} 1. list of arguments can be zero, one, or more. 2. expression body can have one or more statements. Let’s c an example
- 7. Method Reference : Method reference is used to refer method of functional interface. It is compact and easy form of lambda expression. Each time when you are using lambda expression to just referring a method, you can replace your lambda expression with method reference. Types of Method References There are following types of method references. Reference to a static method. Reference to an instance method. Reference to a constructor. Advantages?
- 8. Streams API A Java Stream is a component that is capable to perform internal operations of its elements. For example, it can iterate its elements itself. A stream source can be a Collection, an array, or an I/O channel. Java Example: Filtering Collection without using Stream Java Stream Example: Filtering Collection by using Stream Java Stream Example: Map Collection by using Stream Java Stream Example : reduce() Method in Collection Java Stream Iterating Example
- 9. THANK YOU Will see in Next Class