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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.bytes;
import java.util.Set;
/**
 * An abstract class providing basic methods for sets implementing a
 * type-specific interface.
 */
public abstract class AbstractByteSet extends AbstractByteCollection
		implements
			Cloneable,
			ByteSet {
	protected AbstractByteSet() {
	}
	public abstract ByteIterator iterator();
	public boolean equals(final Object o) {
		if (o == this)
			return true;
		if (!(o instanceof Set))
			return false;
		Set s = (Set) o;
		if (s.size() != size())
			return false;
		return containsAll(s);
	}
	/**
	 * Returns a hash code for this set.
	 *
	 * The hash code of a set is computed by summing the hash codes of its
	 * elements.
	 *
	 * @return a hash code for this set.
	 */
	public int hashCode() {
		int h = 0, n = size();
		ByteIterator i = iterator();
		byte k;
		while (n-- != 0) {
			k = i.nextByte(); // We need k because KEY2JAVAHASH() is a macro
								// with repeated evaluation.
			h += (k);
		}
		return h;
	}
	public boolean remove(byte k) {
		throw new UnsupportedOperationException();
	}
	/**
	 * Delegates to remove().
	 *
	 * @param k
	 *            the element to be removed.
	 * @return true if the set was modified.
	 */
	public boolean rem(byte k) {
		return remove(k);
	}
	/** Delegates to the corresponding type-specific method. */
	public boolean remove(final Object o) {
		return remove(((((Byte) (o)).byteValue())));
	}
}