Java 8 # Remove Duplicate Number from Array.

 import java.util.*;

import java.util.stream.*;
public class DuplicateNumber {
    public static void main(String a[])
    {
        List<Integer> list = Arrays.asList(1, 1, 3, 4, 5, 6, 8, 8, 10, 10);

        List<Integer> result = list.stream()
                .collect(Collectors.groupingBy(i ->i,Collectors.counting()))
                .entrySet()
                .stream()
                .filter( e -> e.getValue() >0)
                .map(Map.Entry::getKey)
                .collect(Collectors.toList());

        System.out.println("---- Value of -----"+result);

    }
}