2.1 What does this program do? | Legion of Learners

A. How to deal with "What does this program do?"?

Examples: 2015-2016 c1-c4, 2016-2017 c1-c4

B. ArrayList in Java

1) An array list starts from an empty list and can grow or shrink. For instance:

ArrayList<String> suits = new ArrayList<String>(); // empty initially

suits.add("club"); // now it has 1 element

suits.add("diamond"); // now it has 2 element

2) In general, the following methods of array lists can help you to play lots of card games, and do other stuff :)

size();
add(aStringOrNumber);
add(int index, aStringOrNumber);
remove(int index);
remove(aStringOrNumber); // remove the first occurrence of aStringOrNumber. 
get(int index);
set(int index, aStringOrNumber);

3) Detailed explanations and examples of the above methods can be found here

C. Now see if you can figure out "What does this program do?" in 2017-2018c4jr or solve this card game.