Arrays(Thinking in Java)

 1 import java.util.*;
 2 
 3 class BerylliumSphere
 4 {
 5     private static long counter;
 6     private final long id = counter++;
 7     public String toString()
 8     {
 9         return "Sphere " + id;
10     }
11 }
12 
13 public class ContainerComparison {
14     public static void main(String[] args)
15     {
16         BerylliumSphere[] spheres = new BerylliumSphere[10];
17         for(int i=0; i<5; i++)
18         {
19             spheres[i] = new BerylliumSphere();
20         }
21         System.out.println(Arrays.toString(spheres));
22         System.out.println(spheres[4]);
23         
24         List<BerylliumSphere> sphereList = new ArrayList<BerylliumSphere>();
25         for(int i=0; i<5; i++)
26         {
27             sphereList.add(new BerylliumSphere());
28         }
29         System.out.println(sphereList);
30         System.out.println(sphereList.get(4));
31         
32         int[] integers = {0,1,2,3,4,5};
33         System.out.println(Arrays.toString(integers));
34         System.out.println(integers[4]);
35         
36         List<Integer> intList = new ArrayList<Integer>(Arrays.asList(0,1,2,3,4,5));
37         intList.add(97);
38         System.out.println(intList);
39         System.out.println(intList.get(4));
40     }
41 }