T instanceof Java

The java “instanceof” operator is used to test whether the object is an instance of the specified type (class or subclass or interface) . If we apply this operator with any variable that has null value, it returns false. …8 Haz 2018

The result of the operation is either true or false. It’s also known as type comparison operator because it compares the instance with type. Before casting an unknown object, the instanceof check should always be used . Doing this helps in avoiding ClassCastException at runtime.6 Ağu 2020

Keep the rocks out of your array and you can avoid instanceof . Or have rocks do nothing when ordered to speak. This is the idea behind the null object pattern.