convert Java to Json Array please assist : I have to convert an Arraylist of users to from java to Json
I figured out how to get the 
user to convert I don't know how to use the syntax for the array
This is in the driver:
					
		// Convert a User to JSON
		String testStr = JsonUserConverter.convertUserToJson(bob);
		System.out.println(testStr);
		
		// Convert JSON string to a User
		User testUser = JsonUserConverter.convertJsonToUser(jsonUserString);
		System.out.println(testUser);
		
		
		// Convert an ArrayList of Users to JSON


and I have to populate this 

public static String convertUsersArrayToJson(ArrayList<User>users){}

with my User data from my User class.  I only just learned about ObjectMapper.  I assume there's something in my library to convert but I don't know.  Help.