What Is Lambda Expression In Java

A single expression lambda body contains a simple Java expression. Such a lambda expression is called an expression lambda. When the lambda expression is executed, the expression in the lambda body is evaluated and the result is returned.

What is lambda expression in Java with example?

Java Lambda Expression Example: You can use lambda expression to run thread. In the following example, we are implementing run method by using lambda expression. Java lambda expression can be used in the collection framework. It provides efficient and concise way to iterate, filter and fetch data.

Additionally, what is lambda in Java and for what it is used? A lambda expression is a block of code that can be passed around to execute. It is a common feature for some programming languages, such as Lisp, Python, Scala, etc. From Java 8, lambda expressions enable us to treat functionality as method argument and pass a block of code around.

So, what is the Lambda?

Lambda is a serverless compute service that runs your code in response to events and automatically manages the underlying compute resources for you. You can use Lambda to extend other AWS services with custom logic, or create your own back-end services that operate at AWS scale, performance, and security.

What is the benefit of lambda expressions in Java?

By using Stream API and lambda expressions, we can achieve higher efficiency (parallel execution) in case of bulk operations on collections. Also, lambda expression helps in achieving the internal iteration of collections rather than external iteration.

A lambda expression is an inline code that implements a functional interface without creating a concrete or anonymous class. A lambda expression is basically an anonymous method.

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Advantages of Lambda Expression

• Fewer Lines of Code − One of the most benefits of a lambda expression is to reduce the amount of code. We know that lambda expressions can be used only with a functional interface. For instance, Runnable is a functional interface, so we can easily apply lambda expressions.
• Sequential and Parallel execution support by passing behavior as an argument in methods − By using Stream API in Java 8, the functions are passed to collection methods. Now it is the responsibility of collection for processing the elements either in a sequential or parallel manner.
• Higher Efficiency − By using Stream API and lambda expressions, we can achieve higher efficiency (parallel execution) in case of bulk operations on collections. Also, lambda expression helps in achieving the internal iteration of collections rather than external iteration.

Syntax

(parameters) -> expression
  or
(parameters) -> { statements; }

Example

import java.util.*;

public class LambdaExpressionTest {
   public static void main(String args[]) {
      new LambdaExpressionTest().print();
   }
   public static void print() {
      List<String> list = new ArrayList<String>();
      list.add("Tutorials Point");
      list.stream().forEach((String) -> { // lambda expression
         System.out.println("The string is: " + list);
      });
   }
}

Output

The string is: [Tutorials Point]