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fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and priority queues with a small memory footprint and fast access and insertion; provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files.

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/*
	* Copyright (C) 2002-2017 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.objects;
import java.util.Set;
/**  An abstract class providing basic methods for sets implementing a type-specific interface.
	*
	* Note that the type-specific {@link Set} interface adds a type-specific {@code remove()}
	* method, as it is no longer harmful for subclasses. Thus, concrete subclasses of this class
	* must implement {@code remove()} (the {@code rem()} implementation of this
	* class just delegates to {@code remove()}).
	*/
public abstract class AbstractObjectSet  extends AbstractObjectCollection  implements Cloneable, ObjectSet  {
	protected AbstractObjectSet() {}
	@Override
	public abstract ObjectIterator  iterator();
	@Override
	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.
	 */
	@Override
	public int hashCode() {
	 int h = 0, n = size();
	 ObjectIterator  i = iterator();
	 K k;
	 while(n-- != 0) {
	  k = i.next(); // We need k because KEY2JAVAHASH() is a macro with repeated evaluation.
	  h += ( (k) == null ? 0 : (k).hashCode() );
	 }
	 return h;
	}
}