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If we implement the interface Iterator, do we have to implement the methods next, hasNext and remove?

April 26, 2017implement interface iterator methods remove

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If we implement the interface Iterator, do we have to implement the methods next, hasNext and remove?

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If you decide to implement the interface Iterator, then you have to implement all three methods. However, the remove method can always throw an UnsupportedOperationException . More information about implementing an interface like Iterator as an inner class can be found here.