Takes an array with String elements, and combines them into a single string, with the given separator in between each element - Java java.lang

Java examples for java.lang:String Array

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Description

Takes an array with String elements, and combines them into a single string, with the given separator in between each element

Demo Code

/*/*from w  ww.  j a va2s  .c o m*/
     Copyright (c) 2015, Louis Capitanchik
     All rights reserved.

     Redistribution and use in source and binary forms, with or without
     modification, are permitted provided that the following conditions are met:

     * Redistributions of source code must retain the above copyright notice, this
     list of conditions and the following disclaimer.

     * Redistributions in binary form must reproduce the above copyright notice,
     this list of conditions and the following disclaimer in the documentation
     and/or other materials provided with the distribution.

     * Neither the name of Affogato nor the names of its associated properties or
     contributors may be used to endorse or promote products derived from
     this software without specific prior written permission.

     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
     FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    //package com.java2s;
    import java.util.Arrays;

    public class Main {
        public static void main(String[] argv) throws Exception {
            String[] arr = new String[] { "1", "abc", "level", null,
                    "java2s.com", "asdf 123" };
            String sep = "java2s.com";
            System.out.println(combineStringArrWithSep(arr, sep));
        }

        /**
         * Takes an array with String elements, and combines them into a single
         * string, with the given separator in between each element
         * @param arr The array of string to combine
         * @param sep The separator to put in between each of the elements
         * @return One of three things depending on the contents of {@code arr}. If
         * {@code arr} is empty, an empty String will be returned. If {@code arr}
         * contains only one element, that element will be returned. Otherwise,
         * the values of {@code arr} will be concatenated, with the provided 
         * separator {@code sep} placed in between each element.
         */
        public static String combineStringArrWithSep(String[] arr, String sep) {
    if(arr.length == 0) {
        return "";
    } else if (arr.length == 1) {
        return arr[0];
    }
        
    StringBuilder s = new StringBuilder();
    s.append(arr[0]);
        
    Arrays.stream(Arrays.copyOfRange(arr, 1, arr.length)).forEach(e -> {
        s.append(sep);
        s.append(e);
    });
        
    return s.toString();
}
    }

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