How to get Common elements from two lists using Stream API filter()

#JavaInspires

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 Hi Guys,

Welcome to Java Inspires.

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In this post, we will see How to get Common elements from two lists using  Stream API filter().

Here, we will create two string lists with some common elements and will get common elements list by using filter method from stream api.

Java8Example.java

package com.javainspires.java8example;

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * 
 * @author Java Inspires
 *
 */
public class Java8Example {

	public static void main(String[] args) {

		// lets create two list with some common elements
		List<String> list1 = Arrays.asList("Arun", "Kent", "Rahul", "Mathew", "Clark");
		System.out.println("List 1 : "+list1);
		List<String> list2 = Arrays.asList("Kent", "Rahul", "Robert", "Alison");
		System.out.println("List 2 : "+list2);
		// use distinct from stream api

		// convert list1 to stream
		Stream<String> stream1 = list1.stream();
		// use distinct from stream and filter
		Stream<String> stream11 = stream1.filter(list2::contains);
		// convert stream to list
		List<String> commonList = stream11.collect(Collectors.toList());
		System.out.println();
		System.out.println("Common Elements : "+commonList);

	}

}

Output::

List 1 : [Arun, Kent, Rahul, Mathew, Clark]
List 2 : [Kent, Rahul, Robert, Alison]

Common Elements : [Kent, Rahul]

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