Java List Concatenate concatList(List strings)

Description

concat List

License

Apache License

Declaration

private static CharSequence concatList(List<String> strings) 

Method Source Code

//package com.java2s;
/*//ww w  . ja v  a 2s  . com
 * Copyright 2017-2018 Eric Bishton
 *
 * 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.List;

public class Main {
    private static final StringBuffer EMPTY_STRINGBUFFER = new StringBuffer(
            "\n");

    private static CharSequence concatList(List<String> strings) {
        if (null == strings) {
            return EMPTY_STRINGBUFFER.subSequence(0,
                    EMPTY_STRINGBUFFER.length());
        }

        // Running the list and calculating the required size first is faster than the reallocs.
        int initialSize = 0;
        for (String s : strings) {
            initialSize += s.length() + 2;
        }

        StringBuilder builder = new StringBuilder(initialSize);
        for (String s : strings) {
            builder.append(s);
            builder.append('\n');
        }

        return builder.subSequence(0, builder.length());
    }
}

Related

1. concatLines(List lines)
2. concatLines(List lines)
3. concatLineSeparated(List discountCommentCauseList)
4. concatList(List list)
5. concatList(List... array)
6. concatListToString(List suggestedList)
7. concatName(String name, List names)
8. concatNodeList(List list)
9. concatPathTokens(String root, List tokens)