unchecked conversion

[amarshi mohanty]

hi,

Box<String> stringBox = new Box<String>();

is converted to

Box stringBox = new Box();

If there is no generic information (Type Erasure Concept), then why the below warning message is thrown by compiler.Does it mean that internally some kind of mapping about <String> stored?

I will define a generic object and assign it to a non-generic type

Box rawBox = new Box();           
Box<String> intBox = rawBox; // warning: unchecked conversion

Regards,
amarshi

[Matthew Brown]

There's no generic information available at run-time...but the compiler isn't running at run time. It runs at compile time (hence the name!). The compiler has full access to all the information in the source code. So the compiler knows you're assigning a non-generic reference to a generic one, and it knows that isn't safe.