37 lines
1.0 KiB
Java
37 lines
1.0 KiB
Java
// collections/CrossCollectionIteration.java
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// (c)2017 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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import typeinfo.pets.*;
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import java.util.*;
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public class CrossCollectionIteration {
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public static void display(Iterator<Pet> it) {
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while(it.hasNext()) {
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Pet p = it.next();
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System.out.print(p.id() + ":" + p + " ");
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}
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System.out.println();
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}
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public static void main(String[] args) {
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List<Pet> pets = Pets.list(8);
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LinkedList<Pet> petsLL = new LinkedList<>(pets);
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HashSet<Pet> petsHS = new HashSet<>(pets);
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TreeSet<Pet> petsTS = new TreeSet<>(pets);
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display(pets.iterator());
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display(petsLL.iterator());
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display(petsHS.iterator());
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display(petsTS.iterator());
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}
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}
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/* Output:
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0:Rat 1:Manx 2:Cymric 3:Mutt 4:Pug 5:Cymric 6:Pug
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7:Manx
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0:Rat 1:Manx 2:Cymric 3:Mutt 4:Pug 5:Cymric 6:Pug
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7:Manx
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0:Rat 1:Manx 2:Cymric 3:Mutt 4:Pug 5:Cymric 6:Pug
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7:Manx
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5:Cymric 2:Cymric 7:Manx 1:Manx 3:Mutt 6:Pug 4:Pug
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0:Rat
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*/
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