将数组转换为默认分隔符（逗号分隔符）分隔的字符串

/** from 
N o w J a v a . c o m - 时  代  Java**/

//package com.nowjava;


public class Main {

    public static void main(String[] argv) throws Exception {

        char[] arr = new char[] { 'b', 'o', 'o', 'k', '2', 's', '.', 'c',

                'o', 'm', 'a', '1', };

        System.out.println(arrayAsString(arr));

    }


    public static String arrayAsString(final char[] arr) throws Exception {


        return arrayAsString(arr, null);

    }
/*from 时 代 J a v a - N o w J a v a . c o m*/

    public static String arrayAsString(final char[] arr,

            final String delimiter) throws Exception {


        final StringBuilder str = new StringBuilder();


        final int lastIndx = arr.length - 1;

        if (lastIndx == -1)

            return "[]";

        // str.append( "[" );


        for (int i = 0;; i++) {

            str.append(arr[i]);

            if (i == lastIndx)

                // return str.append( "]" ).toString();

                return str.toString();

            str.append(delimiter != null ? delimiter.toString() : ", ");

        }

    }


    /**

     * convert the array into string separated by default delimiter which is comma separator

     *

     * @param arr

     * @return

     * @throws Exception

     */

    public static String arrayAsString(final int[] arr) throws Exception {


        return arrayAsString(arr, null);

    }


    /**

     * convert the array into string separated by the delimiter

     *

     * @param arr

     * @param delimiter

     * @return

     * @throws Exception

     */

    public static String arrayAsString(final int[] arr,

            final String delimiter) throws Exception {


        final StringBuilder str = new StringBuilder();


        final