Java练习之使用StringBuilder

 package string.demo;

 /*
  * 将数组变为字符串输出
  */
 public class StringBuilderTest
 {

     /**
      * @param args
      */
     public static void main(String[] args)
     {
         int[] arr = {2, 3, 41, 4};
         String str = arrayToString_2(arr);
         System.out.println(str);

     }

     private static String arrayToString_2(int[] arr)
     {
         StringBuilder sb = new StringBuilder("[");
         for (int i = 0; i < arr.length; i++)
         {
             if (i != arr.length - 1)
                 sb.append(arr[i] + ", ");
             else
                 sb.append(arr[i] + "]");
         }
         return sb.toString();
     }

     public static String arrayToString_1(int[] arr)
     {
         String str = "[";
         for (int i = 0; i < arr.length; i++)
         {
             if (i != arr.length - 1)
                 str += arr[i] + ", ";
             else
                 str += arr[i] + "]";
         }
         return str;
     }
 }