Program to find Duplicate elements in given Array.

FindDuplicateNumberInSeries.java

import java.util.*;


public class FindDuplicateNumberInSeries
{
	public static void main(String[] args)
	{
		Scanner scan= new Scanner(System.in);
		int n = scan.nextInt();//Enter last number (Must have greater then 10)
		List<Integer> numbers = new ArrayList<Integer>();
		
		for(int i=0;i<n-1;i++)
		{
			numbers.add(i);
		}
		numbers.add(10);
		getDuplicateNumber(numbers);
	}

	private static void getDuplicateNumber(List<Integer> numbers)
	{
		List<Integer> _duplicateNumbers = numbers;
		
		System.out.println("_duplicateNumbers.size(): " +_duplicateNumbers.size());
		for(int i=0;i<_duplicateNumbers.size();i++)
		{
			int temp = _duplicateNumbers.get(i);
			for(int j=i+1;j<_duplicateNumbers.size();j++)
			{
				if(temp == _duplicateNumbers.get(j))
				{
					System.out.println("Duplicate Number is : "+temp);
				}
			}
		}
	}
}