Chapter 11, Problem 11.14PE

(Combine two lists) Write a method that returns the union of two array lists of integers using the following header:

public static ArrayList<Integer> union(ArrayList<Integer> list1, ArrayList<Integer> list2)

For example, the addition of two array lists {2, 3, 1, 5} and {3, 4, 6} is {2, 3, 1, 5, 3, 4, 6}. Write a test program that prompts the user to enter two lists, each with five integers, and displays their union. The numbers are separated by exactly one space. Here is a sample run:

  Enter five integers for 1ist1: 3 5 45 4 3

  Enter five integers for list2: 33 51 5 4 13

  The combined 11st is 3 5 45 4 3 33 51 5 4 13