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What is an Iterator?
Some of the collection classes give traversal of their contents via a java.util.Iterator interface. This interface permits you to walk through a collection of objects, operating on every object in turn.
Remember when using Iterators that they have a snapshot of the collection at the time the Iterator was obtained; generally it is not advisable to modify the collection itself whereas traversing an Iterator.
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exlain class and object
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Differentiate Local and Global Variables? Local variables are the variables have limited scope although global have bigger scope Local variables are not accessed through others
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