Java Array Empty Check isEmpty(Object[] arr)

Description

Returns true if arr is null or has length 0.

License

Open Source License

Parameter

Parameter	Description
arr	the array

Return

true if empty and false otherwise

Declaration

public static boolean isEmpty(Object[] arr) 

Method Source Code

//package com.java2s;
/*/*  w ww  .ja  v  a  2s .c  o m*/
 * Copyright (c) 2013 Game Salutes.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser Public License v3
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl.html
 * 
 * Contributors:
 *     Game Salutes - Repackaging and modifications of original work under University of Chicago and Apache License 2.0 shown below
 * 
 * Repackaging from edu.uchicago.nsit.iteco.utils to com.gamesalutes.utils
 * 
 * Copyright 2008 - 2011 University of Chicago
 * 
 * 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 <code>true</code> if <code>value</code> is <code>null</code> or
    * its trimmed length is zero.
    *
    * @param value the <code>String</code>
    * @return <code>true</code> if empty and <code>false</code> otherwise
    */
    // RETAINED FOR COMPATABILITY
    public static boolean isEmpty(String value) {
        return isEmpty((CharSequence) value);
    }

    /**
    * Returns <code>true</code> if <code>value</code> is <code>null</code> or
    * its trimmed length is zero.
    *
    * @param value the <code>String</code>
    * @return <code>true</code> if empty and <code>false</code> otherwise
    */
    public static boolean isEmpty(CharSequence value) {
        if (value == null)
            return true;
        for (int i = 0, len = value.length(); i < len; ++i)
            if (value.charAt(i) > ' ')
                return false;
        return true;
    }

    /**
     * Returns <code>true</code> if <code>collection</code> is <code>null</code>
     * or empty.
     * 
     * @param collection the <code>Collection</code>
     * @return <code>true</code> if empty and <code>false</code> otherwise
     */
    public static boolean isEmpty(Collection<?> collection) {
        return collection == null || collection.isEmpty();
    }

    /**
     * Returns <code>true</code> if <code>m</code> is <code>null</code> or
     * empty.
     * 
     * @param m the <code>Map</code>
     * @return <code>true</code> if empty and <code>false</code> otherwise
     */
    public static boolean isEmpty(Map<?, ?> m) {
        return m == null || m.isEmpty();
    }

    /**
     * Returns <code>true</code> if <code>arr</code> is <code>null</code> or
     * has length 0.
     * 
     * @param arr the array
     * @return <code>true</code> if empty and <code>false</code> otherwise
     */
    public static boolean isEmpty(Object[] arr) {
        return arr == null || arr.length == 0;
    }
}

Related

1. isEmpty(final Object[] array)
2. isEmpty(final X[] array)
3. isEmpty(int[] array)
4. isEmpty(int[] array)
5. isEmpty(Object[] args)
6. isEmpty(Object[] array)
7. isEmpty(Object[] array)
8. isEmpty(Object[] array)
9. isEmpty(Object[] array)