Is it possible to use the instanceof operator in a switch statement?

Question

I have a question of using switch case for instanceof object:

For example: my problem can be reproduced in Java as following-

if(this instanceof A) doA(); else if(this instanceof B) doB(); else if(this instanceof C) doC();

How would it be implemented using switch...case?

If you really feel you need a switch you could hash the class name to an int and use that, watch out for possible clashes though. Adding as comment rather than an answer as I don't like the idea of this actually been used. Maybe what you really need is the visitor pattern. — vickirk
– vickirk, Commented Apr 7, 2011 at 10:13
As of java 7 you could even switch on the fully qualified class name to avoid such hash clashes as @vickirk pointed out, but it's still ugly. — Mitja
– Mitja, Commented Jun 2, 2014 at 16:14

Marinos An · Accepted Answer · 2021-11-01 09:16:08Z

If you want to avoid the verbosity of if(){} else if{}, you may consider switching this single file to kotlin and use the switch-like when expression in combination with is operator.

In any case Kotlin and java files can co-exist in a project and result in a jar that can run in JVM.

when (this) { //switch-like statement in kotlin supporting class-pattern-matching and smart casts via `is` operator. is A -> doA() is B -> doB() is C -> doC() }

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