// collections/PrintingCollections.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.

// Collections print themselves automatically

import java.util.*;

public class PrintingCollections {

static Collection

fill(Collection<String> collection) {

collection.add("rat");

collection.add("cat");

collection.add("dog");

collection.add("dog");

return collection;

}

static Map fill(Map<String, String> map) {

map.put("rat", "Fuzzy");

map.put("cat", "Rags");

map.put("dog", "Bosco");

map.put("dog", "Spot");

return map;

}

public static void main(String[] args) {

System.out.println(fill(new ArrayList<>()));

System.out.println(fill(new LinkedList<>()));

System.out.println(fill(new HashSet<>()));

System.out.println(fill(new TreeSet<>()));

System.out.println(fill(new LinkedHashSet<>()));

System.out.println(fill(new HashMap<>()));

System.out.println(fill(new TreeMap<>()));

System.out.println(fill(new LinkedHashMap<>()));

}

}

/* Output:

[rat, cat, dog, dog]

[rat, cat, dog, dog]

[rat, cat, dog]

[cat, dog, rat]

[rat, cat, dog]

{rat=Fuzzy, cat=Rags, dog=Spot}

{cat=Rags, dog=Spot, rat=Fuzzy}

{rat=Fuzzy, cat=Rags, dog=Spot}

*/