arraylist containsall 28collection c 29 method in java

1import java.util.ArrayList;
2public class ArrayListContainsAllMethodExample
3{
4   public static void main(String[] args)
5   {
6      ArrayList<String> al1 = new ArrayList<String>();
7      al1.add("red");
8      al1.add("green");
9      al1.add("blue");
10      System.out.println("ArrayList 1: " + al1);
11      // creating another ArrayList
12      ArrayList<String> al2 = new ArrayList<String>();
13      // adding elements to second ArrayList
14      al2.add("blue");
15      al2.add("green");
16      System.out.println("ArrayList 2: " + al2);
17      // checking if ArrayList 1 contains ArrayList 2
18      boolean output1 = al1.containsAll(al2);
19      System.out.println("Does ArrayList 1 contains all elements of ArrayList 2?: " + output1);
20      // checking if ArrayList 2 contains ArrayList 1
21      boolean output2 = al2.containsAll(al1);
22      System.out.println("Does ArrayList 2 contains all elements of ArrayList 1?: " + output2);
23   }
24}