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A 2D java physics engine, a port of the C++ Box2d engine. This is the core physics engine.

There is a newer version: 2.2.1.1

/*******************************************************************************
 * Copyright (c) 2011, Daniel Murphy
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the  nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL DANIEL MURPHY BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ******************************************************************************/
/**
 * Created at 5:20:39 AM Jan 22, 2011
 */
package org.jbox2d.dynamics.joints;

/**
 * Gear joint definition. This definition requires two existing
 * revolute or prismatic joints (any combination will work).
 * The provided joints must attach a dynamic body to a static body.
 * @author Daniel Murphy
 */
public class GearJointDef extends JointDef {
	/**
	 * The first revolute/prismatic joint attached to the gear joint.
	 */
	public Joint joint1;

	/**
	 * The second revolute/prismatic joint attached to the gear joint.
	 */
	public Joint joint2;

	/**
	 * Gear ratio.
	 * @see GearJoint
	 */
	public float ratio;
	
	public GearJointDef(){
		type = JointType.GEAR;
		joint1 = null;
		joint2 = null;
	}	
}