Oracle Interview Experience | Set 45 (For 3 Years Experienced)

Oracle 3 years Java Experienced Kolkata location. I attended 2 rounds.

Round 1

  1. List prime factorization of numbers from 1 to 10000
  2. List Armstrong Numbers from 1 to 500
  3. Write 5 features from 5 classes of Collection Framework
  4. Find missing number from given Pattern. It was easy but right now I cannot remember the exact pattern

Round 2

  1. Find Middle element in LinkedList contains millions of millions data by traverse only once and without using extra memory space.





    public E getMidElement() {
        E header = null;
        Iterator<E> increementIterator = linkedList.iterator();
        Iterator<E> headerIterator = linkedList.iterator();
        int counter = 0;
        header = null;
        while (increementIterator.hasNext()) {
            if (counter % 2 == 0)
                header =;
        if (counter % 2 != 0) {
            header =;
        return header;



  2. Listing Contiguous Elements whose sum is maximum in an array contains signed integers
  3. Print ODD numbers in one thread and EVEN numbers in another thread, but final print will be in normal sequesnce e.g. 1 2 3 4 5 …
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