java - How do I check if my object is of type of a given class?

Question

My method gets Class as a parameter and I have to check that one my variables is of type class.

Volvo v1 = new Volvo(); Class aClass = v1.getClass(); check(aClass); 

inside I need to do something like

   v2 instanceof aClass  ? "True" : "False"); 

but this doesn;t compile .

Answer 1

I think you want aClass.isInstance( v2 ). The docs say it works the same as the instanceOf keyword. I guess they can't use instanceOf as a method name because keywords can't be used as method names.

v2 = ??? Volvo v1 = new Volvo(); Class aClass = v1.getClass(); aClass.isInstance( v2 )       // "check(aClass)" 

Or maybe just use a class literal, if "Volvo" is a constant.

v2 = ??? Volvo.class.isInstance( v2 ); 

Answer 2

    Volvo v = new Volvo();     if (v instanceof Volvo) {         System.out.println("I'm boxy, but safe.");     }