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When a class name is used by a method as its return type, like whosFastest would be doing, type’s class of returned objects shall be subclass or exact class of return type. Let’s say that class hierarchy is there where java.lang.Number has a subclass ImaginaryNumber that is also the Object’s subclass that has been illustrated in figure given below:

ImaginaryNumber’s class hierarchy

Let’s say a method has been declared so that ...

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