(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
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
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