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 args
11      */
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             else
28                 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             else
41                 str += arr[i] + "]";
42         }
43         return str;
44     }
45 }