printing duplicate no in the list of integers

printing duplicate no in the list of integers

Posted on December 5, 2022 


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

public class mytest {

	public static void main(String[] args) {
		
		List<Integer> list=Arrays.asList(10,20,10,30,10,20,40,50);
		Set<Integer> set = new HashSet();
		list.stream().filter(x->!set.add(x)).collect(Collectors.toSet()).forEach(x->System.out.println(x));

	}

}

The output will be

20
10