public static <K, V> HashMap<K, V> newHashMap(Collection<?> base) {
		return new HashMap<>(base.size());
	}
Create new {@link HashMap} having same size of given base collection.

@param base collection which size will be referred
@param <K>  keyType
@param <V>  valueType
@return created {@link HashMap} instance
ngrinder-core/src/main/java/org/ngrinder/common/util/CollectionUtils.java