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The testbed for JBox2D, a 2d java physics engine, ported from the C++ Box2d engine.
There is a newer version: 2.2.1.1
/*******************************************************************************
 * Copyright (c) 2013, 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.
 ******************************************************************************/
/**
 * Created at 4:56:29 AM Jan 14, 2011
 */
package org.jbox2d.testbed.tests;

import org.jbox2d.collision.shapes.CircleShape;
import org.jbox2d.collision.shapes.PolygonShape;
import org.jbox2d.common.Vec2;
import org.jbox2d.dynamics.Body;
import org.jbox2d.dynamics.BodyDef;
import org.jbox2d.dynamics.BodyType;
import org.jbox2d.dynamics.FixtureDef;
import org.jbox2d.testbed.framework.TestbedSettings;
import org.jbox2d.testbed.framework.TestbedTest;

/**
 * @author Daniel Murphy
 */
public class VerticalStack extends TestbedTest {
  private static final long BULLET_TAG = 1;
  
  
  public static final int e_columnCount = 5;
  public static final int e_rowCount = 16;

  Body m_bullet;
  
  @Override
  public Long getTag(Body argBody) {
    if(argBody == m_bullet){
      return BULLET_TAG;
    }
    return super.getTag(argBody);
  }
  
  @Override
  public void processBody(Body argBody, Long argTag) {
    if(argTag == BULLET_TAG){
      m_bullet = argBody;
      return;
    }
    super.processBody(argBody, argTag);
  }
  
  @Override
  public boolean isSaveLoadEnabled() {
    return true;
  }

  /**
   * @see org.jbox2d.testbed.framework.TestbedTest#initTest(boolean)
   */
  @Override
  public void initTest(boolean argDeserialized) {
    if(argDeserialized){
      return;
    }
    {
      BodyDef bd = new BodyDef();
      Body ground = getWorld().createBody(bd);

      PolygonShape shape = new PolygonShape();
      shape.setAsEdge(new Vec2(-40.0f, 0.0f), new Vec2(40.0f, 0.0f));
      ground.createFixture(shape, 0.0f);

      shape.setAsEdge(new Vec2(20.0f, 0.0f), new Vec2(20.0f, 20.0f));
      ground.createFixture(shape, 0.0f);
    }

    float xs[] = new float[] { 0.0f, -10.0f, -5.0f, 5.0f, 10.0f };

    for (int j = 0; j < e_columnCount; ++j) {
      PolygonShape shape = new PolygonShape();
      shape.setAsBox(0.5f, 0.5f);

      FixtureDef fd = new FixtureDef();
      fd.shape = shape;
      fd.density = 1.0f;
      fd.friction = 0.3f;

      for (int i = 0; i < e_rowCount; ++i) {
        BodyDef bd = new BodyDef();
        bd.type = BodyType.DYNAMIC;

        int n = j * e_rowCount + i;
        assert (n < e_rowCount * e_columnCount);

        float x = 0.0f;
        // float x = RandomFloat(-0.02f, 0.02f);
        // float x = i % 2 == 0 ? -0.025f : 0.025f;
        bd.position.set(xs[j] + x, 0.752f + 1.54f * i);
        Body body = getWorld().createBody(bd);

        body.createFixture(fd);
      }
    }

    m_bullet = null;
  }

  /**
   * @see org.jbox2d.testbed.framework.TestbedTest#keyPressed(char, int)
   */
  @Override
  public void keyPressed(char argKeyChar, int argKeyCode) {
    switch (argKeyChar) {
      case ',':
        if (m_bullet != null) {
          getWorld().destroyBody(m_bullet);
          m_bullet = null;
        }

        {
          CircleShape shape = new CircleShape();
          shape.m_radius = 0.25f;

          FixtureDef fd = new FixtureDef();
          fd.shape = shape;
          fd.density = 20.0f;
          fd.restitution = 0.05f;

          BodyDef bd = new BodyDef();
          bd.type = BodyType.DYNAMIC;
          bd.bullet = true;
          bd.position.set(-31.0f, 5.0f);

          m_bullet = getWorld().createBody(bd);
          m_bullet.createFixture(fd);

          m_bullet.setLinearVelocity(new Vec2(400.0f, 0.0f));
        }
        break;
    }
  }

  /**
   * @see org.jbox2d.testbed.framework.TestbedTest#step(org.jbox2d.testbed.framework.TestbedSettings)
   */
  @Override
  public void step(TestbedSettings settings) {
    super.step(settings);
    addTextLine("Press ',' to launch bullet.");
  }

  /**
   * @see org.jbox2d.testbed.framework.TestbedTest#getTestName()
   */
  @Override
  public String getTestName() {
    return "Vertical Stack";
  }
}