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Why we use lambda expressions in Java?
A lambda expression can implement a functional interface by defining an anonymous function that can be passed as an argument to some method.
- Enables functional programming: All new JVM based languages take advantage of the functional paradigm in their applications, but programmers forced to work with Object-Oriented Programming (OOPS) till lambda expressions came. Hence lambda expressions enable us to write functional code.
- Readable and concise code: People have started using lambda expressions and reported that it can help to remove a huge number of lines from their code.
- Easy-to-Use APIs and Libraries: An API designed using lambda expressions can be easier to use and support other API.
- Enables support for parallel processing: A lambda expression can also enable us to write parallel processing because every processor is a multi-core processor nowadays.
Syntax
(arg1, arg2...) -> { body }
or
(type1 arg1, type2 arg2...) -> { body }Example
import javax.swing.*;
@FunctionalInterface
interface Action {
void run(String s);
}
public class LambdaExpressionTest {
public void action(Action action) {
action.run("Welcome to TutorialsPoint");
}
public static void main(String[] args) {
new LambdaExpressionTest().action((String s) -> System.out.print("*" + s + "*")); // lambda expression
}
}Output
*Welcome to TutorialsPoint*
Updated on: 11-Jul-2020
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