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fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small memory footprint and fast access and insertion; it provides also big (64-bit) arrays, sets and lists, sorting algorithms, fast, practical I/O classes for binary and text files, and facilities for memory mapping large files. Note that if you have both this jar and fastutil-core.jar in your dependencies, fastutil-core.jar should be excluded.

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/* Generic definitions */
/* Assertions (useful to generate conditional code) */
/* Current type and class (and size, if applicable) */
/* Value methods */
/* Interfaces (keys) */
/* Interfaces (values) */
/* Abstract implementations (keys) */
/* Abstract implementations (values) */
/* Static containers (keys) */
/* Static containers (values) */
/* Implementations */
/* Synchronized wrappers */
/* Unmodifiable wrappers */
/* Other wrappers */
/* Methods (keys) */
/* Methods (values) */
/* Methods (keys/values) */
/* Methods that have special names depending on keys (but the special names depend on values) */
/* Equality */
/* Object/Reference-only definitions (keys) */
/* Primitive-type-only definitions (keys) */
/* Object/Reference-only definitions (values) */
/*		 
 * Copyright (C) 2002-2016 Sebastiano Vigna
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */
package it.unimi.dsi.fastutil.floats;
import it.unimi.dsi.fastutil.BidirectionalIterator;
import it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator;
/**
 * A type-specific bidirectional iterator; provides an additional method to
 * avoid (un)boxing, and the possibility to skip elements backwards.
 *
 * @see BidirectionalIterator
 */
public interface FloatBidirectionalIterator
		extends
			FloatIterator,
			ObjectBidirectionalIterator {
	/**
	 * Returns the previous element as a primitive type.
	 *
	 * @return the previous element in the iteration.
	 * @see java.util.ListIterator#previous()
	 */
	float previousFloat();
	/**
	 * Moves back for the given number of elements.
	 *
	 * 
	 * The effect of this call is exactly the same as that of calling
	 * {@link #previous()} for n times (possibly stopping if
	 * {@link #hasPrevious()} becomes false).
	 *
	 * @param n
	 *            the number of elements to skip back.
	 * @return the number of elements actually skipped.
	 * @see java.util.Iterator#next()
	 */
	int back(int n);
}