Classes that don’t inherit Object class

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According to Java Object superclass, java.lang.Object does not extend Object.

Other than that, all classes, i.e.

class ClassName {
    //some stuff
}

implicitly extend Object class, if they don’t extend any other super-class.

Interfaces, on the other hand, do not extend Object, as Interface, by definition, can not extend Class.
Also, Interfaces can not contain callable methods, nor can objects be instantiated from them. When interfaces are finally implemented, the implementing class will necessarily extend Object (and, no, Object doesn’t implement or extend any other entity/class/interface).

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