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
How to use Supplier interface in lambda expression in Java?
A Supplier<T> interface is a pre-defined interface that represents the supplier of results. It is instantiated using lambda expression or method reference or default constructor. The functional method of a Supplier<T> interface is the get() method. This interface belongs to java.util.function package.
Syntax
@FunctionalInterface public interface Supplier<T>
In the below program, we can use the Supplier interface in a lambda expression. The get() method only returns a value and doesn't accept any argument, so a lambda expression having an empty argument part.
Example
import java.util.*;
import java.util.function.*;
public class SupplierTest {
public static void main(String args[]) {
Supplier<String> supplier1 = () -> "TutorialsPoint"; // lambda expression
System.out.println(supplier1.get());
Supplier<Integer> supplier2 = () -> 7; // lambda expression
System.out.println(supplier2.get());
Person p = new Person("Raja");
Person p1 = get(() -> p);
Person p2 = get(() -> p);
System.out.println(p1.equals(p2));
}
public static Person get(Supplier<Person> supplier) {
return supplier.get();
}
}
// Person class
class Person {
public Person(String name) {
System.out.println(name);
}
}Output
TutorialsPoint 7 Raja true
Updated on: 13-Jul-2020
5K+ Views
Advertisements