Java: instanceof doesn't compile [duplicate]

Question

I'm a newbie to Java and want to write a method checking if this object is of a sub class of given class <p_SuperClassName>. Eclipse denies compilation of the following code giving the message that "cls_Super can not be resolved to a type". I don't know why. Do you have a quick answer to this? Thx a lot in advance!

protected boolean isOfSubClassOf(String p_SuperClassName) { boolean res = false; Class<?> cls_Super = null; try { cls_Super = Class.forName(p_SuperClassName); res = (this instanceof cls_Super); } catch (ClassNotFoundException cnfe) { System.out.println("ClassNotFoundException: Did not find class '" + p_SuperClassName + "'."); cnfe.printStackTrace(); } return res; }

as described previously

is cls_Super really defined as a class? in the scope you provided it is a variable name. — Guy_g23
– Guy_g23, Commented May 29, 2023 at 11:43

Costi Ciudatu · Accepted Answer · 2023-05-29 11:52:57Z

You can't use a Class variable with the instanceof keyword, only the literal type name (e.g. obj instanceof ActualSuperClassName). With an instance of type Class (i.e. cls_Super, in your example), you can perform the same test by using the Class.isInstance method, i.e.:

res = cls_Super.isInstance(this);

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