Java Generics Tutorial
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Java Generics - No instanceOf
Java Generics - No instanceOf
Because compiler uses type erasure, the runtime does not keep track of type parameters, so at runtime difference between Box<Integer> and Box<String> cannot be verified using instanceOf operator.
Box<Integer> integerBox = new Box<Integer>(); //Compiler Error: //Cannot perform instanceof check against //parameterized type Box<Integer>. //Use the form Box<?> instead since further //generic type information will be erased at runtime if(integerBox instanceof Box<Integer>) { }Advertisements