Java Collection Join joinNullSafe(Collection collection, String separator)

Description

join Null Safe

License

Apache License

Parameter

Parameter	Description
collection	to be joined elements.
separator	used in join.

Return

collections elements joined via separator .

Declaration

public static String joinNullSafe(Collection<String> collection,
        String separator) 

Method Source Code

//package com.java2s;
/*//from w ww .  jav a2 s . c o  m
 * #%L
 * P6Spy
 * %%
 * Copyright (C) 2013 P6Spy
 * %%
 * 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.
 * #L%
 */

import java.util.Collection;

public class Main {
    /**
     * @param collection
     *          to be joined elements.
     * @param separator
     *          used in join.
     * @return {@code collections} elements joined via {@code separator}.
     */
    public static String joinNullSafe(Collection<String> collection,
            String separator) {
        if (null == collection || collection.isEmpty()) {
            return "";
        }

        if (null == separator) {
            separator = "";
        }

        final StringBuilder sb = new StringBuilder();
        for (String str : collection) {
            if (sb.length() > 0) {
                sb.append(separator);
            }
            sb.append(str);
        }
        return sb.toString();
    }
}

Related

1. joinCollections(final Collection target, final Collection... collections)
2. joinCollectionToString(Collection list, String str)
3. joinCommaDelimitedList(Collection list)
4. joinEmptyItemIncluded(Collection stringCollection, String delimiter)
5. joinList(@SuppressWarnings("rawtypes") Collection c)
6. joinObjects(Collection