Java List Join joinIntegers(List integers, String token)

Description

join Integers

License

Apache License

Declaration

public static String joinIntegers(List<Integer> integers, String token) 

Method Source Code

//package com.java2s;
/*/*from   w  w  w.  j ava 2 s  .  c om*/
 * ====================================================================
 * Copyright 2005-2011 Wai-Lun Kwok
 *
 * http://www.kwoksys.com/LICENSE
 *
 * 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 {
    public static String joinIntegers(List<Integer> integers, String token) {
        // The joining is tricky as it needs to loop through a String[] and
        // skip empty elements inside the String[]
        if (integers == null || integers.isEmpty()) {
            return "";
        }

        StringBuilder buffer = new StringBuilder();
        boolean appendToken = false;

        for (Integer integer : integers) {
            if (appendToken) {
                buffer.append(token);
            }
            buffer.append(integer);
            // Now, we have the first element, next element should have a comma before it.
            appendToken = true;
        }
        return buffer.toString();
    }

    public static boolean isEmpty(String value) {
        return value == null || value.isEmpty();
    }
}

Related

1. joinArrayString(List values)
2. joinColumnArray(List columnArray)
3. joinCommaAnd(List objs)
4. joinCommaSeparatedList(List list)
5. joinDoubles(List list)
6. joinLines(List lines)
7. joinLinesWithImplicitFinalLine(final List lines)
8. joinList(final List list)
9. joinList(final List list, final String sep)