Write a method that returns the union of two arrays lists of integers using the following header:

Public static ArrayList union (Array list, ArrayList 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 number are separated by exactly one space. Here is a sample run:

Enter five integers for list1: 3 5 45 4 3

Enter five integers for list2: 33 51 5 4 13

The combined list is 3 5 45 4 3 33 51 5 4 13

import java. util.*;

public class Main

{

public static void main (String[] args) {

Scanner input = new Scanner (System. in);

ArrayList l1 = new ArrayList (5);

ArrayList l2 = new ArrayList (5);

System. out. println ("Enter five integers for list1: ");

for (int i=0; i<5; i++) {

int x = input. nextInt ();

l1. add (x);

}

System. out. println ("Enter five integers for list2: ");

for (int i=0; i<5; i++) {

int x = input. nextInt ();

l2. add (x);

}

System. out. println (union (l1, l2));

}

public static ArrayList union (ArrayList list, ArrayList list2) {

for (int i:list2)

list. add (i);

return list;

}

}

Explanation:

Create a method called union takes two lists, list and list2

Inside the method:

Initialize a for loop iterates through the list2

Add all the elements in list2 to list

Return the list

Inside the main:

Declare the lists

Ask the user for the numbers and put them in the lists

Call the union method to combine the lists and print the combined list