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Note that obj instanceof Number is not the same as obj.getClass() == Number.class, as instanceof will return true with all subclasses of Number and the equality test will not. There is a preview feature introduced in Java 23 that allows it to be used with primitives as well. [9]
JavaScript x.constructor (If not rewritten.) x instanceof class — [76] Visual Basic .NET x.GetType() TypeOf x Is type — [74] CType(x, type) or TryCast(x, type) Xojo Introspection.GetType(x) x IsA type — CType(x, type) — Eiffel x.generating_type: attached {TYPE} x: attached {TYPE} x as down_x: Python type(x) isinstance(x, type) — [76 ...
The simplest example of type introspection in Java is the instanceof [1] operator. The instanceof operator determines whether a particular object belongs to a particular class (or a subclass of that class, or a class that implements that interface). For instance:
It provides a means to associate metadata with a class where the language does not have explicit support for such metadata. To use this pattern, a class implements a marker interface [1] (also called tagging interface) which is an empty interface, [2] and methods that interact with instances of that class test for the existence of the interface.
var x1 = 0; // A global variable, because it is not in any function let x2 = 0; // Also global, this time because it is not in any block function f {var z = 'foxes', r = 'birds'; // 2 local variables m = 'fish'; // global, because it wasn't declared anywhere before function child {var r = 'monkeys'; // This variable is local and does not affect the "birds" r of the parent function. z ...
While we could also convert myObject to a compile-time String using the universal java.lang.Object.toString(), this would risk calling the default implementation of toString() where it was unhelpful or insecure, and exception handling could not prevent this. In C++, run-time type checking is implemented through dynamic_cast.
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If the types are not compatible, an exception will be thrown (when dealing with references) or a null pointer will be returned (when dealing with pointers). A Java typecast behaves similarly; if the object being cast is not actually an instance of the target type, and cannot be converted to one by a language-defined method, an instance of java ...