1    package arraylistplay;
2    import java.util.ArrayList;
3    public class Primes {
4    
5    
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("size of primes list = "+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           {
23               System.out.println(prime);
24           }
25   
26           int temp=primes.get(0);
27           primes.set(0,primes.get(primes.size()-1));
28           primes.set(primes.size()-1,temp);
29   
30           System.out.println("\nThe final list ...");
31           for(Integer prime:primes)
32           {
33               System.out.println(prime);
34           }
35       }
36   }
37