Java Collection Size size(Collection c)

Description

Returns the size of the specified collection or 0 if the collection is null .

License

Apache License

Parameter

Parameter	Description
c	the collection to check

Return

the size of the specified collection or 0 if the collection is null .

Declaration

public static int size(Collection c) 

Method Source Code

//package com.java2s;
/*/*  w  w  w . j a v 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.
 */

import java.util.*;

public class Main {
    /**
     * Returns the size of the specified collection or {@code 0} if the collection is {@code null}.
     *
     * @param c the collection to check
     * @return the size of the specified collection or {@code 0} if the collection is {@code null}.
     * @since 1.2
     */
    public static int size(Collection c) {
        return c != null ? c.size() : 0;
    }

    /**
     * Returns the size of the specified map or {@code 0} if the map is {@code null}.
     *
     * @param m the map to check
     * @return the size of the specified map or {@code 0} if the map is {@code null}.
     * @since 1.2
     */
    public static int size(Map m) {
        return m != null ? m.size() : 0;
    }
}

Related

1. size(Collection c)
2. size(Collection collection)
3. size(Collection collection)
4. size(Collection... collections)
5. size(Collection collection)