Currently, when a method of an instance is invoked, it simply uses the exact class of the instance as shown here:

But as of Java9, since the module system prevents accessing classes that are not explicitly open, so it's crucial that we must use the appropriate class, which is open to public, to avoid the module access problems.

At code level, this can be easily done with the method:

by using the interface/abstract class as the clazz parameter.

However, in the TRG script, this is not a valid option. Therefore we will need a new grammar to allow users to 'cast' the instance and invoke the instance's method as the child of the interface/abstract class than directly accessing the method of the child class.

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if the con is an instance that has class A, and A inherits HttpsURLConnection, then before invoking abc() method of the con, it will be first casted to HttpsURLConnection then will invoke abc() of HttpsURLConnection, instead of abc() of the instance con directly.