44 lines
1.3 KiB
Java
44 lines
1.3 KiB
Java
// collections/PrintingCollections.java
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// (c)2016 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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// Collections print themselves automatically
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import java.util.*;
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public class PrintingCollections {
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static Collection fill(Collection<String> collection) {
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collection.add("rat");
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collection.add("cat");
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collection.add("dog");
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collection.add("dog");
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return collection;
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}
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static Map fill(Map<String, String> map) {
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map.put("rat", "Fuzzy");
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map.put("cat", "Rags");
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map.put("dog", "Bosco");
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map.put("dog", "Spot");
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return map;
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}
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public static void main(String[] args) {
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System.out.println(fill(new ArrayList<>()));
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System.out.println(fill(new LinkedList<>()));
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System.out.println(fill(new HashSet<>()));
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System.out.println(fill(new TreeSet<>()));
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System.out.println(fill(new LinkedHashSet<>()));
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System.out.println(fill(new HashMap<>()));
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System.out.println(fill(new TreeMap<>()));
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System.out.println(fill(new LinkedHashMap<>()));
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}
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}
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/* Output:
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[rat, cat, dog, dog]
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[rat, cat, dog, dog]
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[rat, cat, dog]
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[cat, dog, rat]
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[rat, cat, dog]
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{rat=Fuzzy, cat=Rags, dog=Spot}
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{cat=Rags, dog=Spot, rat=Fuzzy}
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{rat=Fuzzy, cat=Rags, dog=Spot}
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*/
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