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HashMapExample.java
Output
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HashMapExample.java
import java.util.Collection; import java.util.HashMap; import java.util.Iterator; /* * Example of values() method. */ public class HashMapExample { public static void main( String[] args ) { HashMap<Integer, String> hashMap = new HashMap<Integer, String>(); hashMap.put(1, "Apple"); hashMap.put(2, "Ball"); hashMap.put(3, "Cat"); System.out.println("hashMap : " + hashMap + "\n"); /* * Returns a Collection view of the values contained in this map. The * collection is backed by the map, so changes to the map are reflected * in the collection, and vice-versa. * * If the map is modified while an iteration over the collection is in * progress (except through the iterator's own remove operation), the * results of the iteration are undefined. The collection supports * element removal, which removes the corresponding mapping from the * map, via the Iterator.remove, Collection.remove, removeAll, retainAll * and clear operations. It does not support the add or addAll * operations. */ Collection<String> collection = hashMap.values(); System.out.println("collection : " + collection + "\n"); for( Iterator<String> iterator = collection.iterator(); iterator .hasNext(); ) { String value = iterator.next(); System.out.println(value); } } }
hashMap : {1=Apple, 2=Ball, 3=Cat} collection : [Apple, Ball, Cat] Apple Ball Cat
https://sites.google.com/site/javaee4321/java-collections/HashMapDemoValues.zip?attredirects=0&d=1
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