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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.
 * 
 * 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 THE COPYRIGHT HOLDER OR CONTRIBUTORS 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.
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package org.jbox2d.collision.broadphase;

// updated to rev 100
/**
 * Java note: at the "creation" of each node, a random key is given to
 * that node, and that's what we sort from.
 */
public class Pair implements Comparable {
	public int proxyIdA;
	public int proxyIdB;
	
	public int compareTo(Pair pair2) {
		if (this.proxyIdA < pair2.proxyIdA) {
			return -1;
		}
		
		if (this.proxyIdA == pair2.proxyIdA) {
			
			if (proxyIdB < pair2.proxyIdB) {
				return -1;
			}
			else {
				if (proxyIdB == pair2.proxyIdB) {
					return 0;
				}
				else {
					return 1;
				}
			}
		}
		
		return 1;
	}
}