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long start = System.currentTimeMillis();for (int
i = 0; i < 1000000; i++) {}long end = System.currentTimeMillis();System.out.println("---:"+(end-start));long start1 = System.currentTimeMillis();for (int
i = 0; i < 1000000; i++) { try
{ } catch
(Exception e) { }}long
end1 = System.currentTimeMillis();System.out.println("---:"+(end1-start1));long
start2 = System.currentTimeMillis();for
(int
i = 0; i < 1000000; i++) { try
{ throw
new Exception(); } catch
(Exception e) { }}long
end2 = System.currentTimeMillis();System.out.println("---:"+(end2-start2)); |
---:1
---:1
---:795
try catch只要不抛异常就对效率影响不大。
-------------------------------------------------------------
在第一个循环里加入system.out.print("");其余两个循环try catch里也加入system.out.print("");
---:136
---:130
---:920
堆栈跟踪
原文：http://www.cnblogs.com/keia/p/3566443.html