Java性能测试-优快云博客

本文链接：https://blog.youkuaiyun.com/todd_liu/article/details/6737770

本文通过不同方式访问成员字段、调用方法以及创建对象等操作对比了Java 1.6.0_13版本下直接访问、引用访问及反射访问的性能差异。

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Java version 1.6.0_13
Java HotSpot(TM) Client VM
11.3-b02
Sun Microsystems Inc.

Direct access using member field:
47 125 47 46 46
average time = 66 ms.
Reference access to member field:
109 109 110 94 109
average time = 106 ms.
Reflection access to member field:
13094 12984 13063 13062 13094
average time = 13051 ms.

Java version 1.6.0_13
Java HotSpot(TM) Client VM
11.3-b02
Sun Microsystems Inc.

Direct call using member field:
47 31 109 109 31
average time = 70 ms.
Direct call using passed value:
16 16 16 31 15
average time = 20 ms.
Call to object using member field:
46 47 47 47 32
average time = 43 ms.
Call to object using passed value:
15 16 31 16 16
average time = 20 ms.
Reflection call using member field:
812 782 844 844 844
average time = 829 ms.
Reflection call using passed value:
938 953 954 1031 953
average time = 973 ms.

Java version 1.6.0_13
Java HotSpot(TM) Client VM
11.3-b02
Sun Microsystems Inc.

Direct Object creation:
62 47 78 32 93
average time = 63 ms.
Reflection Object creation:
125 94 94 109 187
average time = 121 ms.
Direct byte[8] creation:
125 187 94 172 94
average time = 137 ms.
Reflection byte[8] creation:
266 171 187 188 219
average time = 191 ms.
Direct byte[64] creation:
250 172 156 125 203
average time = 164 ms.
Reflection byte[64] creation:
281 219 203 203 219
average time = 211 ms.