crosscontaineriteration.java

《Thinking in Java 4th Edition》 Source Code

//: holding/CrossContainerIteration.java
import typeinfo.pets.*;
import java.util.*;

public class CrossContainerIteration {
  public static void display(Iterator<Pet> it) {
    while(it.hasNext()) {
      Pet p = it.next();
      System.out.print(p.id() + ":" + p + " ");
    }
    System.out.println();
  }	
  public static void main(String[] args) {
    ArrayList<Pet> pets = Pets.arrayList(8);
    LinkedList<Pet> petsLL = new LinkedList<Pet>(pets);
    HashSet<Pet> petsHS = new HashSet<Pet>(pets);
    TreeSet<Pet> petsTS = new TreeSet<Pet>(pets);
    display(pets.iterator());
    display(petsLL.iterator());
    display(petsHS.iterator());
    display(petsTS.iterator());
  }
} /* Output:
0:Rat 1:Manx 2:Cymric 3:Mutt 4:Pug 5:Cymric 6:Pug 7:Manx
0:Rat 1:Manx 2:Cymric 3:Mutt 4:Pug 5:Cymric 6:Pug 7:Manx
4:Pug 6:Pug 3:Mutt 1:Manx 5:Cymric 7:Manx 2:Cymric 0:Rat
5:Cymric 2:Cymric 7:Manx 1:Manx 3:Mutt 6:Pug 4:Pug 0:Rat
*///:~