1    package arraylistplay;
2    
3    import java.util.ArrayList;
4    
5    public class Primes {
6    public static void main(String[] args) {
7    
8    
9        ArrayList<Integer> primes = new ArrayList<>();
10   
11       primes.add(2);
12       primes.add(3);
13       primes.add(5);
14       primes.add(7);
15   
16   
17       System.out.println("size of primes list = " + primes.size());
18       System.out.println("first prime = " + primes.get(0));
19       System.out.println("last prime = " + primes.get(3));
20       System.out.println("last prime = " + primes.get(primes.size()-1));
21   
22       System.out.println("\nThe initial list ...");
23       for ( Integer prime : primes ) {
24           System.out.println(prime);
25   
26       }
27   int temp = primes.get(0);
28       primes.set(0, primes.get(primes.size()-1));
29       primes.set(primes.size()-1,temp);
30       System.out.println("\nThe final list ...");
31       for ( Integer prime : primes ) {
32           System.out.println(prime);
33       }
34   
35   }
36   
37   
38   
39   
40   
41   
42   
43   
44   
45   
46   
47   
48   
49   }
50