POJI: stands for Plain Old Java Interface. A POJI is an ordinary interface without any specialties. The interfaces that do not extend from technology/framework specific interfaces. For example all user defined interfaces are POJI and an interface that inherits from AppletInitializer of Java Beans is not POJI.
Explanation: Here both the interfaces i.e. GFG and Geeks are POJI in nature. Because both GFG and Geeks does not extends from any technology specific interface.
Explanation: Here GFG is also a POJI. Here the interface is extending from Serializable interface but that serializable interface is not the part of any Technology, it is about Java API. Therefor we can say that GFG is POJI in nature.
Explanation: Here GFG1 and GFG2 are not POJI in nature. Because Remote and AppletInitializer not part of API, it is technology.
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