Questions every good Java/Java EE Developer should be able to answer? -

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i going through questions every .net developer should able answer , highly impressed content , approach of question, , in same spirit, asking question java/java ee developer.

what questions think should java/java ee programmer able answer?

i marking question community wiki not user specific , aims serve programming community @ large.

looking forward amazing responses.

edit: please answer questions too, suggested in comments, people learn new regarding language, too.

what relationship between hashcode() , equals()? significance of these methods? requirements implementing them?


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