Using instanceof with a class Object

Question

What's the correct syntax to make this work?

public boolean isTypeOf(Class type) {
     return this instanceof type;
}

I intend to call it with:

foo.isTypeOf(MyClass.class);

The method will be overriden, otherwise I would just use instanceof inplace.

Did you know about Class.isInstance(Object)? - http://docs.oracle.com/javase/7/docs/api/java/lang/Class.html#isInstance(java.lang.Object) — Injektilo, Sep 21 '15 at 13:48
Note that in Java's grammar, an instance of Class is not a type name - it's a value, and there is no way to get a typename from a value, even with generics (for example, in a generic function you can't say `if(someObject instanceof T)`. — Injektilo, Sep 21 '15 at 13:53

Tunaki · Accepted Answer · 2015-09-21T13:51:24.743

8

public boolean isTypeOf(Class type) {
     return type.isInstance(this);
}

This method determines if the given parameter is an instance of the class. This method will also work if the object is a sub-class of the class.

Quoting from the Javadoc:

This method is the dynamic equivalent of the Java language instanceof operator.

edited Sep 21 '15 at 13:51

answered Sep 21 '15 at 13:47

Tunaki

1 Answers1