Class PrintingCollections

collections/PrintingCollections.java:8–34

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]