www.pudn.com > ThinkinginJava4thEdition(SourceCode).zip > ContainerComparison.java

//: arrays/ContainerComparison.java 
import java.util.*; 
import static net.mindview.util.Print.*; 
 
class BerylliumSphere { 
  private static long counter; 
  private final long id = counter++; 
  public String toString() { return "Sphere " + id; } 
} 
 
public class ContainerComparison { 
  public static void main(String[] args) { 
    BerylliumSphere[] spheres = new BerylliumSphere[10]; 
    for(int i = 0; i < 5; i++) 
      spheres[i] = new BerylliumSphere(); 
    print(Arrays.toString(spheres)); 
    print(spheres[4]); 
 
    List sphereList = 
      new ArrayList(); 
    for(int i = 0; i < 5; i++) 
      sphereList.add(new BerylliumSphere()); 
    print(sphereList); 
    print(sphereList.get(4)); 
 
    int[] integers = { 0, 1, 2, 3, 4, 5 }; 
    print(Arrays.toString(integers)); 
    print(integers[4]); 
 
    List intList = new ArrayList( 
      Arrays.asList(0, 1, 2, 3, 4, 5)); 
    intList.add(97); 
    print(intList); 
    print(intList.get(4)); 
  } 
} /* Output: 
[Sphere 0, Sphere 1, Sphere 2, Sphere 3, Sphere 4, null, null, null, null, null] 
Sphere 4 
[Sphere 5, Sphere 6, Sphere 7, Sphere 8, Sphere 9] 
Sphere 9 
[0, 1, 2, 3, 4, 5] 
4 
[0, 1, 2, 3, 4, 5, 97] 
4 
*///:~