Implement three stacks in one array.

Source Code:
Github: ThreeStackArray.java

Output:

 
{[1], [2], [3]}
{[1], [5, 5, 4, 2], [3]}
{[1], [7, 6, 5, 5, 4, 2], [3]}
{[8, 1], [7, 6, 5, 5, 4, 2], [3]}