Java练习之使用StringBuilder

 1 package string.demo; 2  3 /* 4  * 将数组变为字符串输出 5  */ 6 public class StringBuilderTest 7 { 8  9     /**10      * @param args11      */12     public static void main(String[] args)13     {14         int[] arr = {2, 3, 41, 4};15         String str = arrayToString_2(arr);16         System.out.PRintln(str);17         18     }19     20     private static String arrayToString_2(int[] arr)21     {22         StringBuilder sb = new StringBuilder("[");23         for (int i = 0; i < arr.length; i++)24         {25             if (i != arr.length - 1)26                 sb.append(arr[i] + ", ");27             else28                 sb.append(arr[i] + "]");29         }30         return sb.toString();31     }32 33     public static String arrayToString_1(int[] arr)34     {35         String str = "[";36         for (int i = 0; i < arr.length; i++)37         {38             if (i != arr.length - 1)39                 str += arr[i] + ", ";40             else41                 str += arr[i] + "]";42         }43         return str;44     }45 }