How to calculate element-wise maximum of two ArrayLists?

I need to write a function, than call in the main, which calculates element-wise maximum of two ArrayLists, returning third ArrayList as a result. If one of the input ArrayLists is longer than another, the extra elements should be just copied to the output ArrayList.

Example:

Input: {2,3,4,5} and {3,1,4,6,8,9}

Output: {3,3,4,6,8,9}