Java Object Size size(Object o)

Description

size

License

Open Source License

Declaration

public static int size(Object o) 

Method Source Code

//package com.java2s;
/*//from  w w w . jav a  2s.  c  o m
 * Distributed as part of mchange-commons-java 0.2.9
 *
 * Copyright (C) 2015 Machinery For Change, Inc.
 *
 * Author: Steve Waldman <swaldman@mchange.com>
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of EITHER:
 *
 *     1) The GNU Lesser General Public License (LGPL), version 2.1, as 
 *        published by the Free Software Foundation
 *
 * OR
 *
 *     2) The Eclipse Public License (EPL), version 1.0
 *
 * You may choose which license to accept if you wish to redistribute
 * or modify this work. You may offer derivatives of this work
 * under the license you have chosen, or you may provide the same
 * choice of license which you have been offered here.
 *
 * This software 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.
 *
 * You should have received copies of both LGPL v2.1 and EPL v1.0
 * along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
 * If not, the text of these licenses are currently available at
 *
 * LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 *  EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php 
 * 
 */

import java.util.*;

public class Main {
    public static int size(Object o) {
        if (o instanceof Collection)
            return ((Collection) o).size();
        else if (o instanceof Map)
            return ((Map) o).size();
        else if (o instanceof Object[])
            return ((Object[]) o).length;
        else if (o instanceof boolean[])
            return ((boolean[]) o).length;
        else if (o instanceof byte[])
            return ((byte[]) o).length;
        else if (o instanceof char[])
            return ((char[]) o).length;
        else if (o instanceof short[])
            return ((short[]) o).length;
        else if (o instanceof int[])
            return ((int[]) o).length;
        else if (o instanceof long[])
            return ((long[]) o).length;
        else if (o instanceof float[])
            return ((float[]) o).length;
        else if (o instanceof double[])
            return ((double[]) o).length;
        else
            throw new IllegalArgumentException(o + " must be a Collection, Map, or array!");
    }
}