Java List Join joinCommaSeparatedList(List list)

Description

Joins a list of Strings to a comma separated single String.

License

Apache License

Parameter

Parameter	Description
list	the list to join

Return

the resulting comma separated string or null if the list is null

Declaration

public static String joinCommaSeparatedList(List<String> list) 

Method Source Code

//package com.java2s;
/* 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.//  ww  w .j a v  a 2 s.c o m
 */

import java.util.List;

public class Main {
    /**
     * Joins a list of Strings to a comma separated single String.
     *
     * @param list  the list to join
     * @return the resulting comma separated string or null if the list is null
     */
    public static String joinCommaSeparatedList(List<String> list) {
        return joinList(list, ", ");
    }

    public static String joinList(List<String> list, String separator) {
        if (list == null) {
            return null;
        }

        int size = list.size();
        if (size == 0) {
            return "";
        } else if (size == 1) {
            return list.get(0);
        } else {
            StringBuilder builder = new StringBuilder(size * 8);
            builder.append(list.get(0));
            for (Object element : list.subList(1, size)) {
                builder.append(separator);
                builder.append(element);
            }
            return builder.toString();
        }
    }
}

Related

1. joinAndQuote(char joinChar, char quoteChar, List strings)
2. joinArray(List list, String separator)
3. joinArrayString(List values)
4. joinColumnArray(List columnArray)
5. joinCommaAnd(List objs)
6. joinDoubles(List list)
7. joinIntegers(List integers, String token)
8. joinLines(List lines)
9. joinLinesWithImplicitFinalLine(final List lines)