Create a file named A10.java. Place all your code in this file. Create a publicstatic ArrayList of integers named intList. Define a public static method addNumber(int i) that adds ito your list.
Exercise 2
Create a publicstatic HashMap of integers, integers namedintMap.
Define a public static method addPair(int i, int j) that adds i, jto your HashMap (make ithe key and j the value).

Explanation:

The file named as A10.java has been attached to this response. It contains the source code for the exercises. The source code contains comments explaining important parts of the code.

A few things to note;

i. To add an item to an arraylist, the add() method is used. For example to add an integer 7 to the arraylist named intList, simply write;

intList.add(7);

ii. To add an item to a hashmap, the put() method is used. The put method receives two parameters which are the key and value respectively. The key is a form of identifier used to store or retrieve a particular value in a hashmap. To store an integer 8 with a key of 5 in a hashmap named intMap, for example, simply write;

intMap.put(5,8);

the answer is c