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The Trove library provides high speed regular and primitive collections for Java.

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// ////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2009, Rob Eden All Rights Reserved.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// ////////////////////////////////////////////////////////////////////////////

package gnu.trove.impl.sync;

import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Collection;
import java.util.Iterator;


/**
 *
 */
class SynchronizedCollection implements Collection, Serializable {
	private static final long serialVersionUID = 3053995032091335093L;

	final Collection c;  // Backing Collection
	final Object mutex;     // Object on which to synchronize

	SynchronizedCollection( Collection c, Object mutex ) {
		this.c = c;
		this.mutex = mutex;
	}

	public int size() {
		synchronized( mutex ) { return c.size(); }
	}
	public boolean isEmpty() {
		synchronized( mutex ) { return c.isEmpty(); }
	}
	public boolean contains( Object o ) {
		synchronized( mutex ) { return c.contains( o ); }
	}
	public Object[] toArray() {
		synchronized( mutex ) { return c.toArray(); }
	}
	@SuppressWarnings({"SuspiciousToArrayCall"})
	public  T[] toArray( T[] a ) {
		synchronized( mutex ) { return c.toArray( a ); }
	}

	public Iterator iterator() {
		return c.iterator(); // Must be manually synched by user!
	}

	public boolean add( E e ) {
		synchronized( mutex ) { return c.add( e ); }
	}
	public boolean remove( Object o ) {
		synchronized( mutex ) { return c.remove( o ); }
	}

	public boolean containsAll( Collection coll ) {
		synchronized( mutex ) { return c.containsAll( coll ); }
	}
	public boolean addAll( Collection coll ) {
		synchronized( mutex ) { return c.addAll( coll ); }
	}
	public boolean removeAll( Collection coll ) {
		synchronized( mutex ) { return c.removeAll( coll ); }
	}
	public boolean retainAll( Collection coll ) {
		synchronized( mutex ) { return c.retainAll( coll ); }
	}
	public void clear() {
		synchronized( mutex ) { c.clear(); }
	}
	public String toString() {
		synchronized( mutex ) { return c.toString(); }
	}
	private void writeObject( ObjectOutputStream s ) throws IOException {
		synchronized( mutex ) { s.defaultWriteObject(); }
	}
}