1)-The Stack class in the JCF uses a(n)___________

2)- Don't use java.util.Stack class, instead use________ to create instance of a stack.

3)- Given the statement: String str = "Mary had a little lamb";

(i)-Write the statement to split using the letter as the delimeter?

(ii)- Create a StringTokenizer tokens object, Which tokenziers the above string with letter a as the delimeter.