37 lines
1.1 KiB
Java
37 lines
1.1 KiB
Java
// collections/SimpleIteration.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 SimpleIteration {
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public static void main(String[] args) {
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List<Pet> pets = Pets.list(12);
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Iterator<Pet> it = pets.iterator();
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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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// A simpler approach, when possible:
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for(Pet p : pets)
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System.out.print(p.id() + ":" + p + " ");
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System.out.println();
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// An Iterator can also remove elements:
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it = pets.iterator();
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for(int i = 0; i < 6; i++) {
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it.next();
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it.remove();
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}
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System.out.println(pets);
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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 8:Cymric 9:Rat 10:EgyptianMau 11:Hamster
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0:Rat 1:Manx 2:Cymric 3:Mutt 4:Pug 5:Cymric 6:Pug
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7:Manx 8:Cymric 9:Rat 10:EgyptianMau 11:Hamster
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[Pug, Manx, Cymric, Rat, EgyptianMau, Hamster]
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*/
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