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justify answer object reuse

 
Greenhorn
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question: 1.which are following support object reuse?
1.class inheritance
2.object composition
3.java beans
4.attributes
 
Ranch Hand
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I would go with JavaBeans. "Reusable components JavaBeans"


Thanks,
 
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1, inheritance - you are reusing something already written and adding/overiding new stuff
---
2, this is just using old stuff, so I see no reuse here
3, do not know, but looks like using only components already written
4, nonsense

- question says object reuse, so I'm not sure now. I was thinking more about class reuse.
 
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It's not clear what is intended by the term "object reuse". I'm guessing it means reuse of implementation, so this is my take given that assumption:

Inheritance and composition are the two big mechanisms for reusing functionality in an object-oriented language. In addition, the idea of JavaBeans, as Chandra points out, is to create reusable software components. Without qualification, the fourth option, "attributes", doesn't make much sense.
 
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