19 сент. 2008 г. · Modern JVM/JIT compilers have removed the performance hit of most of the traditionally "slow" operations, including instanceof, exception ...

5 апр. 2016 г. · instanceof on the other hand has its own bytecode operation, so it can potentially be even faster.

20 июн. 2018 г. · Can someone explain me why variant with instanceof faster 350 times than variant with class name switching with strings?

25 окт. 2011 г. · instanceof is pretty damn fast. However, it's generally a symptom of a poorly thought out design. It'll have around the same performance as a (successful) cast.

11 февр. 2011 г. · It does generate some overhead, combined with the subsequent casting. With recent version of Java the overhead has decreased.

7 янв. 2013 г. · Now I'm writing an ORM Framework and very care about performance. In this Framework , I have to use instanceof and Class.isAssignableFrom to ...

24 окт. 2017 г. · Yes, it is that fast for most cases, including the trivial case like yours. It first optimistically checks for the exact hit on the type ...

17 июн. 2015 г. · Yes, in general using `instanceof`` is a symptom of a bad/poor design. The trick is to use double dispatch or visitor pattern. Look on the web.

29 авг. 2018 г. · instanceof is faster. Changing one method of my app to instanceof if-else (7 classes), instead of polymorphism, reduced its load by almost 3%.

20 янв. 2012 г. · Use isAssignableFrom (which is resolved dynamically) in only the top level class. Makes for much concise code and you dont have to overload a third method.