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Function Functional Interface in Java 8 – Definition, Syntax & Real-World Use Cases
The Function functional interface is a predefined interface introduced in Java 8 as part of the java.util.function package. It represents a function that accepts one input argument and produces one result. This interface is widely used in lambda expressions, Stream API operations, and functional programming. A key feature of the Function interface is that it enables developers to define reusable transformation logic, where an input object is converted into another form. For example, converting a String into its length, a Student object into a grade, or an entity into a DTO. Function is functional interface that takes one argument and produces a result , Syntax: Program1 : Write a program…
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Stream API in Java 8: Complete Guide with Examples
Stream api is a powerful abstraction for processing sequence of elements in a functional and declarative style . it allows developers to perform complex data manipulations such as filtering , mapping , sorting and reducing with minimal boilerplate code . Stream represent a pipeline of operations that can be executed either sequentially or in parallel , improving both readability and performance . Purpose of Stream Api The main goals of the stream api are . 1.Simplify data processing: Replace verbose loops with expressive operations 2.Enable Functional programing : use lambda expressions and method references 3. Improve Performance: Support parallel execution with parallel stream . Pipeline in Java Stream A stream…
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Functional Programming in Java Using Lambda Expressions
A lambda expression is a short and concise way to represent an anonymous function—a function without a name . Key Features 1.Why Lambda expression required Lambda expression required to enable functional programming ,lambda expression allow you to define small functions without naming them . this is useful when the function is simple and used only once or a few times . Lambda Syntax : 2.Lambda Expression Example Example 1: Addition of Number Without Lambda Expressions With Lambda Expressions Example 2: Find the length of String without Lambda Expressions With Lambda Expression if single statements are there then curly bracket not required , if body contained multiple lines of code then…