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JCommon is a free general purpose Java class library that is used in several projects at www.jfree.org, including JFreeChart and JFreeReport.
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/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 * 
 * Project Info:  http://www.jfree.org/jcommon/index.html
 *
 * 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 Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 * 
 * -----------
 * Size2D.java
 * -----------
 * (C) Copyright 2000-2005, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: Size2D.java,v 1.8 2005/11/16 15:58:41 taqua Exp $
 *
 * Changes (from 26-Oct-2001)
 * --------------------------
 * 26-Oct-2001 : Changed package to com.jrefinery.ui.*;
 * 14-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 10-Nov-2004 : Added default constructor, added setWidth() and setHeight() 
 *               methods, added equals() method, implemented Cloneable, 
 *               PublicCloneable and Serializable (DG);
 * 02-Feb-2005 : Added toString() method (DG);
 *
 */

package org.jfree.ui;

import java.io.Serializable;

import org.jfree.util.PublicCloneable;

/**
 * A simple class for representing the dimensions of an object.  It would be
 * better to use Dimension2D, but this class is broken on various
 * JDK releases (particularly JDK 1.3.1, refer to bugs 4189446 and 4976448 on 
 * the Java bug parade).
 *
 * @author David Gilbert
 */
public class Size2D implements Cloneable, PublicCloneable, Serializable {

    /** For serialization. */ 
    private static final long serialVersionUID = 2558191683786418168L;
    
    /** The width. */
    public double width;

    /** The height. */
    public double height;

    /**
     * Creates a new instance with zero width and height.
     */
    public Size2D() {
        this(0.0, 0.0);
    }
    
    /**
     * Creates a new instance with the specified width and height.
     *
     * @param width  the width.
     * @param height  the height.
     */
    public Size2D(final double width, final double height) {
        this.width = width;
        this.height = height;
    }

    /**
     * Returns the width.
     *
     * @return The width.
     */
    public double getWidth() {
        return this.width;
    }
    
    /**
     * Sets the width.
     * 
     * @param width  the width.
     */
    public void setWidth(final double width) {
        this.width = width;
    }

    /**
     * Returns the height.
     *
     * @return The height.
     */
    public double getHeight() {
        return this.height;
    }
    
    /**
     * Sets the height.
     * 
     * @param height  the height.
     */
    public void setHeight(final double height) {
        this.height = height;
    }
    
    /**
     * Returns a string representation of this instance, mostly used for 
     * debugging purposes.
     * 
     * @return A string.
     */
    public String toString() {
        return "Size2D[width=" + this.width + ", height=" + this.height + "]";   
    }

    /**
     * Compares this instance for equality with an arbitrary object.
     * 
     * @param obj  the object (null permitted).
     * 
     * @return A boolean.
     */
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof Size2D)) {
            return false;
        }
        final Size2D that = (Size2D) obj;
        if (this.width != that.width) {
            return false;
        }
        if (this.height != that.height) {
            return false;
        }
        return true;
    }
    
    /**
     * Returns a clone of this object.
     * 
     * @return A clone.
     * 
     * @throws CloneNotSupportedException if the object cannot be cloned.
     */
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
    
}