Java Collection Join join(Collection strings, String separator)

Description

Join a Collection of String with the given separator

License

Apache License

Parameter

Parameter	Description
strings	a parameter
separator	a parameter

Declaration

public static String join(Collection<String> strings, String separator) 

Method Source Code

//package com.java2s;
/**// w w w  .  j  a v  a 2 s  . c o m
 *  Copyright 2016 Polydeuce-Sys Ltd
 *
 *       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.Collection;

public class Main {
    private static final String DEFAULT_SEPARATOR = ",";

    /**
     * Join an array of String with the given separator
     * @param strings
     * @param separator
     * @return
     */
    public static String join(String[] strings, String separator) {
        StringBuilder sb = new StringBuilder();
        for (String s : strings) {
            sb.append(s).append(separator);
        }
        if (sb.length() > 0) {
            int li = sb.lastIndexOf(separator);
            sb.delete(li, sb.length());
        }
        return sb.toString();
    }

    /**
     * Join a {@link Collection} of String with the given separator
     * @param strings
     * @param separator
     * @return
     */
    public static String join(Collection<String> strings, String separator) {
        return join(strings.toArray(new String[strings.size()]), separator);
    }

    /**
     * Join a {@link Collection} of String with ","
     * @param strings
     * @return
     */
    public static String join(Collection<String> strings) {
        return join(strings.toArray(new String[strings.size()]), DEFAULT_SEPARATOR);
    }
}

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