Insert the missing code in the following code fragment.This fragment is intended to create an iterator and access the first element in a tree. A)Iterator iter = aTree.iterator(); B)Iterator iter = aTree.iterator(); C)Iterator iter = String.iterator(); D)Iterator iter = aTree.iterator();

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Quizplus · Accepted Answer

The correct syntax to create an iterator for a TreeSet is Iterator<Type> iterator = aTree.iterator(), where "Type" is the type of elements in the TreeSet. In this case, since it is not specified, we can assume it is a set of strings. Therefore, choice A is the correct syntax to create the iterator object. Choice B is incorrect because the syntax for specifying the type parameter is incorrect. Choice C is incorrect because String.iterator() would create an iterator for the characters in a string, not for a tree data structure. Choice D is incorrect because the type parameter specified in the iterator creation should match the type of elements in the TreeSet, which in this case is a set of strings.

Insert the Missing Code in the Following Code Fragment