Iterator in the HashMap is fail-safe means what?

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Question Posted / sandya

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Iterator in the HashMap is fail-safe means what?..

Answer / amol

The iterators for the concrete collection implementations
are fail-fast.
That means that if you are using an Iterator to traverse a
collection while underlying collection is being modified by
another thread, then the Iterator fails immediately by
throwing a ConcurrentModificationException (another
RuntimeException). That means the next time an Iterator
method is called, and the underlying collection has been
modified, the ConcurrentModificationException exception gets
thrown.

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Iterator in the HashMap is fail-safe means what?..

Answer / namy

Fail-safe is relevant from the context of iterators. If an iterator has been created on a collection object and some other thread tries to modify the collection object "structurally”, a concurrent modification exception will be thrown. It is possible for other threads though to invoke "set" method since it doesn’t modify the collection "structurally”. However, if prior to calling "set", the collection has been modified structurally, "IllegalArgumentException" will be thrown.

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Iterator in the HashMap is fail-safe means what?..

Answer / parthasarathi

can you please tell me about the use of marker interface?

Ans: Marker or taged interfaces having no methods.example
Cloneable,Serializable etc.Actually this interfaces give
some infermation about a object.that means internally it
check the object wheather it belongs to that interface or
not,using instanceOf() methd.

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Iterator in the HashMap is fail-safe means what?..

Answer / yathirajulu

fail-safe means, The ability of a system to fail but not
produce a catastrophic result.

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Iterator in the HashMap is fail-safe means what?..

Answer / guest

ok i got. but what is fail-safe? i want meaning?

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Iterator in the HashMap is fail-safe means what?..

Answer / sandya

ok Thanq Yathirajulu.

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Iterator in the HashMap is fail-safe means what?..

Answer / deepak divvela

i know this thing only,please ignore if it is wrong.
that is hashmap will have only key/value pair.
but iterator will not get key/value pairs at a time.
so for that reason hashmap is fails.

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Iterator in the HashMap is fail-safe means what?..

Answer / yathirajulu

HashMap is fail-safe is nothing but, 'security' for store
null values to extent forward

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Iterator in the HashMap is fail-safe means what?..

Answer / yathirajulu m

because, HashMap allows null values so, it is fail-safe.

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