There are two classes: A and B. The class B need to inform a class A when some important event has happened. What Java techniqu

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There are two classes: A and B. The class B need to inform a class A when some important event has happened. What Java technique would you use to implement it?

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If these classes are threads I'd consider notify() or notifyAll(). For regular classes you can use the Observer interface.

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There are two classes: A and B. The class B need to inform a class A when some important event has happened. What Java techniqu
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