更快的是:instanceof或isInstance? [英] What's faster: instanceof or isInstance?
本文介绍了更快的是:instanceof或isInstance?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
除了设计问题之外，什么在现代JVM上执行得更快?
Design questions aside, what performs faster on modern JVMs?
foo instanceof Bar
或
Bar.class.isInstance(foo)
为什么?
推荐答案
Class.isInstance是JVM固有的.它的编译顺序与instanceof完全相同(HotSpot源代码的证明:
Class.isInstance is JVM intrinsic. It is compiled to exactly the same sequence as instanceof does (the proof from HotSpot source code: 1, 2). That is, they both are equal in terms of performance.
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