Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
What is the data type of a lambda expression in Java?
The lambda expressions have a very simple, precise syntax and provide flexibility to specify the datatypes for the function parameters. Its return type is a parameter -> expression body to understand the syntax, we can divide it into three parts.
- Parameters : These are function method parameters and match with the signature of a function defined in the functional interface. Defining the data-type of parameters is optional but the number of parameters can match with the defined signatures in the interface.
- Expression Body : This is either a single statement or collection of statements that represent the function definition. Defining the data-type for return object is optional.
- -> : This represents the lambda expression operator.
Example
interface Hello {
String sayHello(String name);
}
public class LambdaExpressionTest {
public static void main(String args[]) {
Hello hello = (message) -> {
String str1 = "Hello ";
String str2 = str1 + message;
return str2;
};
System.out.println(hello.sayHello("Tutorials Point"));
}
}Output
Hello Tutorials Point
Updated on: 02-Dec-2019
1K+ Views
Advertisements