How to depict inheritance from standard JAVA class?


I am new in UML area. I have my class MyApplet which should be descendant of JApplet class. JApplet class is in javax.swing package. I want to create class diagram which depict MyApplet class as descendant of JApplet class.
I expected that UML tool will offer me some possibility to choose from JDK1.4 JAVA classes from which I can inherit my class but it was not so.
What is practise if I want to create class diagram with my class inheriting from JDK1.4 class? Generation of JAVA code depends on class diagram that’s why I need to have good class diagram.

Thanks for answer

Dear User,
Currently, we don’t provide the Java Base class.

Best Regards,