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So I have this one line of code here:

LinkedList<Integer> p = (LinkedList) obj.c.clone();

I was wondering why do you need the (LinkedList) part before obj.c.clone()?

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The answer is: You need type casting to get access to target class methods and fields.

Object and LinkedList is same type hierarchy, so you can cast, otherwise You would get ClassCastException in Java. For more information about type casting, See this link.

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Method Object.clone() returns result of Object type. If you want use it as LinkedList you need explicit cast result to LinkedList type.

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clone() method returns an Object, so you have to cast it to LinkedList

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LinkedList class implements Java´s clonable interface. If you read the documentation on that concrete interface you find clone deffinition is:

protected Object clone()

That is, a reference to an Object object, in Java, to any object which is not an unwrapped basic type.

You need to cast the reference type to LinkedList´s in order to be able to use ("view") its methods/attributes not included in Object class definition.

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