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I have a ClassA that is being used my many components and libraries in various areas of a project.
Now I need to add an extra member to this class but since it will not be needed/used by other areas it does not feel proper to extend the class.
If I add the member to ClassA instead of extending would I have any issues? Would everything need to be rebuild?
Adding a new member preserves binary compatibility, see also Chapter 13. Binary Compatibility of the Java Language specification.
Obviously you need to rebuild the modified class, but not classes which are using the modified one.