一般而言，移位操作符的处理速度快于算术运算

示例代码如下

 1 public class Test
 2 
 3 {
 4 
 5     public static void main(String[] args)
 6 
 7     {
 8 
 9         int low = 0;
10         int high = 9;
11 
12 
13 
14         long startTime = System.currentTimeMillis();
15 
16         for (int i = 0; i < Integer.MAX_VALUE; ++i)
17         {
18 
19             int temp = (low + high) >>> 1;
20         }
21 
22         long midTime = System.currentTimeMillis();
23 
24         for (int i = 0; i < Integer.MAX_VALUE; ++i)
25         {
26 
27             int temp = (low + high) / 2;
28         }
29 
30         long endTime = System.currentTimeMillis();
31 
32 
33 
34         System.out.println(midTime - startTime);
35 
36         System.out.println(endTime - midTime);
37 
38     }
39 
40 }

输出结果如下

1 1804
2 7699

 

posted on 2011-12-21 15:36  cssin  阅读(372)  评论(0)    收藏  举报

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