45 lines
1.6 KiB
Java
45 lines
1.6 KiB
Java
//: holding/InterfaceVsIterator.java
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import typeinfo.pets.*;
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import java.util.*;
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public class InterfaceVsIterator {
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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 display(Collection<Pet> pets) {
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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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}
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public static void main(String[] args) {
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List<Pet> petList = Pets.arrayList(8);
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Set<Pet> petSet = new HashSet<>(petList);
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Map<String,Pet> petMap = new LinkedHashMap<>();
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String[] names = ("Ralph, Eric, Robin, Lacey, " +
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"Britney, Sam, Spot, Fluffy").split(", ");
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for(int i = 0; i < names.length; i++)
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petMap.put(names[i], petList.get(i));
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display(petList);
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display(petSet);
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display(petList.iterator());
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display(petSet.iterator());
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System.out.println(petMap);
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System.out.println(petMap.keySet());
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display(petMap.values());
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display(petMap.values().iterator());
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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 7:Manx
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2:Cymric 1:Manx 0:Rat 6:Pug 5:Cymric 4:Pug 3:Mutt 7:Manx
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0:Rat 1:Manx 2:Cymric 3:Mutt 4:Pug 5:Cymric 6:Pug 7:Manx
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2:Cymric 1:Manx 0:Rat 6:Pug 5:Cymric 4:Pug 3:Mutt 7:Manx
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{Ralph=Rat, Eric=Manx, Robin=Cymric, Lacey=Mutt, Britney=Pug, Sam=Cymric, Spot=Pug, Fluffy=Manx}
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[Ralph, Eric, Robin, Lacey, Britney, Sam, Spot, Fluffy]
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0:Rat 1:Manx 2:Cymric 3:Mutt 4:Pug 5:Cymric 6:Pug 7:Manx
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0:Rat 1:Manx 2:Cymric 3:Mutt 4:Pug 5:Cymric 6:Pug 7:Manx
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*///:~
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