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