Java 8 coding interview questions

In this tutorial, I am sharing the some Java 8 interview coding questions with answers. I hope it will be helpful for you guys while preparing for an interview.

1. How do you remove duplicate elements from a list using Java 8 streams?

package com.gain.java.knowledge;

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

public class RemoveDuplicate {

    public static void main(String[] args) {

        //Creating a list of strings named listOfNames containing some names. 
        //The Arrays.asList method is used to convert an array of strings into a List.
        List<String> listOfNames = Arrays.asList("sumit", "rohit", "kailash", "lucky", "joney", "rohit");
        List<String> uniqueNames = listOfNames.stream()
                                    .distinct()
                                    .collect(Collectors.toList());
        System.out.println(uniqueNames);
    }
}

Output :
=======
[sumit, rohit, kailash, lucky, joney]

List<String> uniqueNames = listOfNames.stream()
                                    .distinct()
                                    .collect(Collectors.toList());

Step 1 : listOfNames.stream() -The stream() method is called on the listOfNames, which converts the list into a stream.
Step 2 : .distinct() - distinct() method is used to filter out duplicate elements from the…