This topic is about Java Generics – No Cast.
Casting to a parameterized type is not allowed unless it is parameterized by unbounded wildcards.
Box<Integer> integerBox = new Box<Integer>(); Box<Number> numberBox = new Box<Number>(); //Compiler Error: Cannot cast from Box<Number> to Box<Integer> integerBox = (Box<Integer>)numberBox;
To achive the same, unbounded wildcards can be used.
private static void add(Box<?> box) {
Box<Integer> integerBox = (Box<Integer>)box;
}
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