Code example for Collection

Methods: addAll

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   } 
 
   @Override 
   public Collection<V> put(K key, Collection<V> coll){
      Collection<V> values = getList(key);
      values.addAll(coll);
      return super.put(key, values);
   } 
 
   @Override 
   public Collection<V> get(Object key){
      return super.get(key);
   } 
 
   public V getFirstValue(K key) {
	   Collection<V> values = getList(key, false);
	    
	   if (ListUtil.isEmpty(values)) {
		   return null; 
	   }