Returns the size of the collection or array - Java java.util

Java examples for java.util:Collection to Array

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Description

Returns the size of the collection or array

Demo Code

/**/*from   www  . j av a2 s.co  m*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;
import java.lang.reflect.Array;
import java.util.Collection;

public class Main {
    public static void main(String[] argv) {
        Object collection = "java2s.com";
        System.out.println(size(collection));
    }

    /**
     * Returns the size of the collection or array
     */
    public static int size(Object collection) {
        if (collection instanceof Collection) {
            Collection value = (Collection) collection;
            return value.size();
        } else if (collection != null) {
            if (collection.getClass().isArray()) {
                return Array.getLength(collection);
            }
        }
        return 0;
    }
}

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