http://fastutil.di.unimi.it/: 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.
  • Sebastiano Vigna 
/*
	* Copyright (C) 2002-2019 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.doubles;

An abstract class providing basic methods for priority queues implementing a
type-specific interface.

Deprecated:As of fastutil 8 this class is no longer necessary, as its
            previous abstract methods are now default methods of the
            type-specific interface.
/**
 * An abstract class providing basic methods for priority queues implementing a
 * type-specific interface.
 * 
 * @deprecated As of fastutil 8 this class is no longer necessary, as its
 *             previous abstract methods are now default methods of the
 *             type-specific interface.
 */
@Deprecated
public abstract class AbstractDoublePriorityQueue extends it.unimi.dsi.fastutil.AbstractPriorityQueue<Double>
		implements
			java.io.Serializable,
			DoublePriorityQueue {
	private static final long serialVersionUID = 1L;
}