So you have this code you want to reuse. You can extend the class, inheriting not only what you need, but everything else along with it. In java, this also limits you, as you can only extend one object at a time.
An alternative is to make a class that delegates to the reused code.
An adaptor is a class specifically used in between legacy code with one interface and new code that wants another interface. The adaptor presents the new interface, effectively translating things and allowing the legacy code to exist within the new design.
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