1. Implement Custom Comparable (Package name: comparable)

2. Implement Custom Comparaor (Package name: comparator)

3. Find Duplicate Elements in Array. (Package name: duplicateelements)

4. Find all pairs of an integer array whose sum is equal to a given number. (Package name: equalpairsum)

5. Find the largest and smallest number in an unsorted array. (Package name: maxminarray)

6. Find the missing number in a given integer array of 1 to n. (Package name: missingnumber)

7. Find Freqeuncy of elements in array (Package name: duplicateinarray.Hashtable)

8. Check Palindrome using Recursion (Package name: palindromerecursion)

9. Implement Stack in Java (not using collections) (Package name: customstack)

10. Chess Problem. Kings Move (Package name: chessproblem)