Work exercise 11.4, 11.12, and 11.14 into one program (to develop 3 methods for ArrayList: first method finds the maximum element in an array list; the second method computes the sum of all elements in an array list; and the third method combines (union) two lists by adding the second list to the first list). Use Integer type for all methods. See problem statements for methods signatures and sample test data.

Write one separate test program to test all three methods.