What is the cause of NoSuchElementException
The NoSuchElementException in Java is thrown when one tries to access an iterable beyond its maximum limit. This means that, this exception is thrown by various accessor methods to indicate that the element being requested does not exist . The next() method in Java returns the next element in the iteration or NoSuchElementException if the iteration has no more elements.
How to solve NoSuchElementException?
As with most programming languages, the Iterator class includes a hasNext() method that returns a boolean indicating if the iteration has anymore elements. If hasNext() returns true, then the next() method will return the next element in the iteration otherwise raise exceptions if the iteration has no more elements. The solution to this? exception is to check whether the next position of an iterable is filled or empty . The following methods are used to check the next position:
This way ensures that any element is being accessed if it exists.
An exception is a problem that arises during the execution of a program. An exception can occur for many different reasons. The NoSuchElementException is an unchecked exception and thus, it does not need to be declared in a method's or a constructor's throws clause. The full exception hierarchy of this error is:
The java.util.NoSuchElementException is a RuntimeException which can be thrown by different classes in Java like Iterator, Enumerator, Scanner or StringTokenizer . It is thrown by the following methods:
- nextElement() of Enumeration interface
- next() of NamingEnumeration interface
- nextElement() of StringTokenizer class
- next() of Iterator interface
Similarly, the previous() method of the ListIterator returns the previous element of the collection, if this method is invoked on an empty object or at the stating position of it a NoSuchElementException is generated at the runtime.