1    package arraylistplay;
2    
3    import java.util.ArrayList;
4    
5    public class Primes {
6        public static void main(String[]args){
7    
8            ArrayList<Integer> primes = new ArrayList<>();
9    
10           primes.add(2);
11           primes.add(3);
12           primes.add(5);
13           primes.add(7);
14   
15           System.out.println("Length of primes array = " +primes.size());
16           System.out.println("First Prime = "+primes.get(0));
17           System.out.println("Last Prime = " +primes.get(3));
18           System.out.println("Last Prime = "+primes.get(primes.size()-1));
19   
20           System.out.println("\nThe initial list ...");
21           for(Integer prime:primes){
22               System.out.println(primes);
23           }
24           int temp = primes.get(0);
25           primes.set(0, primes.get(primes.size()-1));
26           primes.set(primes.size()-1,temp);
27   
28           System.out.println("\n The final list ...");
29           for (Integer prime: primes){
30               System.out.println(prime);
31           }
32       }
33   }
34