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// collections/InterfaceVsIterator.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import reflection.pets.*;

import java.util.*;

public class InterfaceVsIterator {

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 display(Collection<Pet> pets) {

for(Pet p : pets)

System.out.print(p.id() + ":" + p + " ");

System.out.println();

}

public static void main(String[] args) {

List<Pet> petList = new PetCreator().list(8);

Set<Pet> petSet = new HashSet<>(petList);

Map<String, Pet> petMap = new LinkedHashMap<>();

String[] names = ("Ralph, Eric, Robin, Lacey, " +

"Britney, Sam, Spot, Fluffy").split(", ");

for(int i = 0; i < names.length; i++)

petMap.put(names[i], petList.get(i));

display(petList);

display(petSet);

display(petList.iterator());

display(petSet.iterator());

System.out.println(petMap);

System.out.println(petMap.keySet());

display(petMap.values());

display(petMap.values().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

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

{Ralph=Rat, Eric=Manx, Robin=Cymric, Lacey=Mutt,

Britney=Pug, Sam=Cymric, Spot=Pug, Fluffy=Manx}

[Ralph, Eric, Robin, Lacey, Britney, Sam, Spot, Fluffy]

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

*/