Java Iterable isEmpty(Iterable iterable)

Description

 isEmpty( null ) = true isEmpty( Arrays.asList()) = true isEmpty( Arrays.asList("") ) = false 

License

Apache License

Parameter

Parameter	Description
iterable	a parameter

Declaration

public static boolean isEmpty(Iterable<?> iterable) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2011 Danny Kunz//from w w w  . j a  va2 s  . c om
 * 
 * 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.Iterator;

public class Main {
    /**
     * <pre>
     * isEmpty( null ) = true
     * isEmpty( Arrays.asList()) = true
     * isEmpty( Arrays.asList("") ) = false
     * </pre>
     * 
     * @param iterable
     * @return
     */
    public static boolean isEmpty(Iterable<?> iterable) {
        //
        boolean retval = true;

        //
        if (iterable != null) {
            //
            Iterator<?> iterator = iterable.iterator();
            retval = iterator == null || !iterator.hasNext();
        }

        //
        return retval;
    }
}

Related

1. getMessageString(Iterable msgs)
2. getUnique(Iterable iterable)
3. implodeStrings(Iterable strings, String glue)
4. indexOfSame(Iterable iterable, T obj)
5. internalSeparate(StringBuilder buff, Iterable args, String separator, String useWhenNone)
6. isEmpty(Iterable i)
7. iterable(final Iterable in)
8. max(Iterable iterable)
9. mergeConsecutiveTokens(Iterable tokens)