how iterator works in java?
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["Obtain an iterator to the start of the collection by calling the collection's iterator( ) method.", 'Set up a loop that makes a call to hasNext( ). Have the loop iterate as long as hasNext( ) returns true.', 'Within the loop, obtain each element by calling next( ).']
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Every generator is an iterator, but not vice versa. A generator is built by calling a function that has one or more yield expressions ( yield statements, in Python 2.5 and earlier), and is an object that meets the previous paragraph's definition of an iterator .
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Iterator and for-each loop are faster than simple for loop for collections with no random access, while in collections which allows random access there is no performance change with for-each loop/for loop/iterator.
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Any use of lists that's required to perform well for insertions with saved iterators will use linked lists. They're a fundamental structure and won't go away.
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The order in which the elements contained in a Java Iterator are traversed depends on the object that supplies the Iterator . For instance, an iterator obtained from a List will iterate through the elements of that List in the same order the elements are stored internally in the List .
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Fail-fast iterators in Java don't play along when the underlying collection gets modified. Collections maintain an internal counter called modCount. Each time an item is added or removed from the Collection, this counter gets incremented.
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An iterator does not make use of local variables, all it needs is iterable to iterate on. A generator may have any number of 'yield' statements. You can implement your own iterator using a python class; a generator does not need a class in python. ... They are also simpler to code than do custom iterator.
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Range-for is as fast as possible since it caches the end iterator[citation provided], uses pre-increment and only dereferences the iterator once. Then, yes, range-for may be slightly faster, since it's also easier to write there's no reason not to use it (when appropriate).
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The NoSuchElementException in Java is thrown when one tries to access an iterable beyond its maximum limit. The exception indicates that there are no more elements remaining to iterate over ​in an enumeration.
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Collection is a high-level interface describing Java objects that can contain collections of other objects. ... Collections are only iterable sequentially (and in no particular order) whereas a List allows access to an element at a certain position via the get(int index) method.
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['public class DoWhileExample {', 'public static void main(String[] args) {', 'int i=1;', 'do{', 'System. out. println(i);', 'i++;', '}while(i<=10);', '}']
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Fail-safe iterators means they will not throw any exception even if the collection is modified while iterating over it. Whereas Fail-fast iterators throw an exception(ConcurrentModificationException) if the collection is modified while iterating over it.
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An external iterator is active, an internal is passive. When the client (i.e. the programmer) controls the iteration, the iterator is called external iterator. When the iterator controls it, it is called an internal iterator. ... Internal iteration is less error prone, more readable, and requires less code.
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The Java do-while loop is used to iterate a part of the program several times. If the number of iteration is not fixed and you must have to execute the loop at least once, it is recommended to use do-while loop. The Java do-while loop is executed at least once because condition is checked after loop body.
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An iterator is an object that contains a countable number of values. An iterator is an object that can be iterated upon, meaning that you can traverse through all the values. Technically, in Python, an iterator is an object which implements the iterator protocol, which consist of the methods __iter__() and __next__() .
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Python map() function map() function returns a map object(which is an iterator) of the results after applying the given function to each item of a given iterable (list, tuple etc.) Syntax : map(fun, iter) Parameters : fun : It is a function to which map passes each element of given iterable.
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['On the first iteration of i=0, the inner loop executes 0 times.', 'On the first iteration of i=1, the inner loop executes 1 times.', '.', '.', 'On the first iteration of i=n-1, the inner loop executes n-1 times.']