Java Collection Empty isEmpty(Collection col)

Description

Returns true if a collection is null or empty

License

Apache License

Parameter

Parameter	Description
col	collection to be tested if empty

Return

true if the collection is null or empty

Declaration

public static boolean isEmpty(Collection<?> col) 

Method Source Code

//package com.java2s;
/*/*from ww w  .ja v  a 2s.co  m*/
 * Copyright 2014-2015 JKOOL, LLC.
 *
 * Licensed 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.Collection;

import java.util.Map;

public class Main {
    /**
     * Returns true if the string is null or empty
     *
     * @param str
     *            string handle
     * @return true if the string is null or empty
     */
    public static boolean isEmpty(String str) {
        return (str == null || str.trim().isEmpty());
    }

    /**
     * Returns true if a collection is null or empty
     *
     * @param col
     *            collection to be tested if empty
     * @return true if the collection is null or empty
     */
    public static boolean isEmpty(Collection<?> col) {
        if (col == null)
            return true;
        return col.isEmpty();
    }

    /**
     * Returns true if a map is null or empty
     *
     * @param map
     *            map to be tested if empty
     * @return true if the collection is null or empty
     */
    public static boolean isEmpty(Map<?, ?> map) {
        if (map == null)
            return true;
        return map.isEmpty();
    }
}

Related

1. isEmpty(Collection col)
2. isEmpty(Collection c)
3. isEmpty(Collection c)
4. isEmpty(Collection c)
5. isEmpty(Collection col)
6. isEmpty(Collection collection)
7. isEmpty(Collection collection)
8. isEmpty(Collection collection)
9. isEmpty(Collection collection)