# Component diagram: Use intereface of sub class diagram

**URL:** <https://forums.visual-paradigm.com/t/component-diagram-use-intereface-of-sub-class-diagram/12809>\
**Category:** General Questions/Discussions\
**Created:** [May 2, 2017, 7:37pm UTC](https://forums.visual-paradigm.com/t/component-diagram-use-intereface-of-sub-class-diagram/12809 "2017-05-02T19:37:22Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Anonymous](https://avatars.discourse-cdn.com/v2/letter/a/8491ac/32.png) [@Anonymous](https://forums.visual-paradigm.com/u/Anonymous)\
**Post date:** [May 4, 2017, 9:20am UTC](https://forums.visual-paradigm.com/t/component-diagram-use-intereface-of-sub-class-diagram/12809/1 "2017-05-04T09:20:47Z")

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Greetings,

my question is: Can I use an `<<interface>>` of a class diagram as the realisation interface of a super component diagram?

I am using the facade pattern, so I am designing clear interfaces within the class diagram. I’d love to use these `<<interfaces>>` of the class diagram within my component diagram so the component diagram inherits the interface and changes while i change the class diagram.

Best regards,  
Malte

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**Author:** ![antony](https://forums.visual-paradigm.com/user_avatar/forums.visual-paradigm.com/antony/32/2411_2.png) [@antony](https://forums.visual-paradigm.com/u/antony)\
**Post date:** [August 10, 2017, 5:32am UTC](https://forums.visual-paradigm.com/t/component-diagram-use-intereface-of-sub-class-diagram/12809/2 "2017-08-10T05:32:55Z")

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Hi Malte,

Sorry but I don’t get what is the \<\> you refer to, can you explain further? Thank you very much.

Antony.

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**Author:** ![antony](https://forums.visual-paradigm.com/user_avatar/forums.visual-paradigm.com/antony/32/2411_2.png) [@antony](https://forums.visual-paradigm.com/u/antony)\
**Post date:** [August 11, 2017, 12:53am UTC](https://forums.visual-paradigm.com/t/component-diagram-use-intereface-of-sub-class-diagram/12809/3 "2017-08-11T00:53:47Z")

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Sorry, I figured out it is our forum migration problem makes certain words disappear. I know you are referring to the `<<interface>>`.

Yes, by default an interface created in Component Diagram is shown as ball shape, to make it a normal box shape like in Class Diagram, just select **Presentation Options** -\> **Class** from the popup menu. I hope this answers your question.

Best Regards,

Antony.