Computer scienceProgramming languagesJavaCode organizationObject-oriented programmingClass hierarchiesBuilding class hierarchies

Runtime type checking

Theory

File classes

Report a typo

Below you can see a class hierarchy of files:

class File { /* fields and methods */ }

class ImageFile extends File { /* fields and methods */ }

class TextFile extends File { /* fields and methods */ }

and three objects:

File file = new File();

File img = new ImageFile();

File txt = new TextFile();

Select all true statements.

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