Find Number of duplicates present in a ArrayList

sample.java

	public static void main(String[] args) {
	
		List<Integer> list = new ArrayList<Integer>();
		list.add(67);
		list.add(32);
		list.add(6);
		list.add(4);
		list.add(67);
		list.add(3);
		list.add(6);
		list.add(2);
		list.add(6);
		list.add(2);
		list.add(67);
		list.add(6);
		list.add(4);
		
		Set<Integer> filterList = new HashSet<Integer>(list);
		Iterator<Integer> iterator = filterList.iterator();
		while(iterator.hasNext()){
            int number = iterator.next();
            int occurrence = Collections.frequency(list, number);
			System.out.println("| Number \t"+number+"\t| occures : \t"+occurrence+"  Times |");
			System.out.println(" ------------------------------------------------");
		}
		

	}