Question 8: Java coding interview questions

 Answer:

You can simply use stream and then collect it to set using Collections.toSet() method.

import java.util.Arrays;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
 
public class RemoveDuplicatesFromListMain {
    public static void main(String[] args)
    {
        Integer[] arr=new Integer[]{1,2,3,4,3,2,4,2};
        List<Integer> listWithDuplicates = Arrays.asList(arr);
 
        Set<Integer> setWithoutDups = listWithDuplicates.stream().collect(Collectors.toSet());
        setWithoutDups.forEach((i)->System.out.print(" "+i));
    }
}

You can use distinct as well to avoid duplicates as following.
change main method of above program as below.

Integer[] arr=new Integer[]{1,2,3,4,3,2,4,2};
        List<Integer> listWithDuplicates = Arrays.asList(arr);
List<Integer> listWithoutDups = listWithDuplicates.stream().distinct().collect(Collectors.toList());
        listWithoutDups.forEach((i)->System.out.print(" "+i));

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