Last element iterator java

How to get the last but one element of an Iterator (Java)

I’m curios about how an Iterator works. My current goal is to get the last but one element of an Iterator in Java. Is there a way to get this element without changing the Iterator to a Array or List?
And if it’s possible how there must be a way to get the last but n element of an Iterator.

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1 Answer 1

If the functionThatThrowsStackOverflowError method is throwing the error, then your test case should work.

You can try following example and then replace the testMethod() with your functionThatThrowsStackOverflowError method to narrow down the root cause,

@Test(expected = StackOverflowError.class) public void testError() < testMethod(); >private void testMethod()

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Last element iterator java

This interface is a member of the Java Collections Framework.

Method Summary

Performs the given action for each remaining element until all elements have been processed or the action throws an exception.

Removes from the underlying collection the last element returned by this iterator (optional operation).

Method Detail

hasNext

Returns true if the iteration has more elements. (In other words, returns true if next() would return an element rather than throwing an exception.)

next

remove

Removes from the underlying collection the last element returned by this iterator (optional operation). This method can be called only once per call to next() . The behavior of an iterator is unspecified if the underlying collection is modified while the iteration is in progress in any way other than by calling this method, unless an overriding class has specified a concurrent modification policy. The behavior of an iterator is unspecified if this method is called after a call to the forEachRemaining method.

forEachRemaining

Performs the given action for each remaining element until all elements have been processed or the action throws an exception. Actions are performed in the order of iteration, if that order is specified. Exceptions thrown by the action are relayed to the caller. The behavior of an iterator is unspecified if the action modifies the collection in any way (even by calling the remove method or other mutator methods of Iterator subtypes), unless an overriding class has specified a concurrent modification policy. Subsequent behavior of an iterator is unspecified if the action throws an exception.

 while (hasNext()) action.accept(next()); 

Report a bug or suggest an enhancement
For further API reference and developer documentation see the Java SE Documentation, which contains more detailed, developer-targeted descriptions with conceptual overviews, definitions of terms, workarounds, and working code examples.
Java is a trademark or registered trademark of Oracle and/or its affiliates in the US and other countries.
Copyright © 1993, 2023, Oracle and/or its affiliates, 500 Oracle Parkway, Redwood Shores, CA 94065 USA.
All rights reserved. Use is subject to license terms and the documentation redistribution policy.

Источник

Interface Iterator

This interface is a member of the Java Collections Framework.

Method Summary

Performs the given action for each remaining element until all elements have been processed or the action throws an exception.

Removes from the underlying collection the last element returned by this iterator (optional operation).

Method Details

hasNext

Returns true if the iteration has more elements. (In other words, returns true if next() would return an element rather than throwing an exception.)

next

remove

Removes from the underlying collection the last element returned by this iterator (optional operation). This method can be called only once per call to next() . The behavior of an iterator is unspecified if the underlying collection is modified while the iteration is in progress in any way other than by calling this method, unless an overriding class has specified a concurrent modification policy. The behavior of an iterator is unspecified if this method is called after a call to the forEachRemaining method.

forEachRemaining

Performs the given action for each remaining element until all elements have been processed or the action throws an exception. Actions are performed in the order of iteration, if that order is specified. Exceptions thrown by the action are relayed to the caller. The behavior of an iterator is unspecified if the action modifies the collection in any way (even by calling the remove method or other mutator methods of Iterator subtypes), unless an overriding class has specified a concurrent modification policy. Subsequent behavior of an iterator is unspecified if the action throws an exception.

 while (hasNext()) action.accept(next()); 

Report a bug or suggest an enhancement
For further API reference and developer documentation see the Java SE Documentation, which contains more detailed, developer-targeted descriptions with conceptual overviews, definitions of terms, workarounds, and working code examples. Other versions.
Java is a trademark or registered trademark of Oracle and/or its affiliates in the US and other countries.
Copyright © 1993, 2023, Oracle and/or its affiliates, 500 Oracle Parkway, Redwood Shores, CA 94065 USA.
All rights reserved. Use is subject to license terms and the documentation redistribution policy.

Источник

Last element iterator java

Performs the given action for each remaining element until all elements have been processed or the action throws an exception.

Removes from the underlying collection the last element returned by this iterator (optional operation).

Method Detail

hasNext

Returns true if the iteration has more elements. (In other words, returns true if next() would return an element rather than throwing an exception.)

next

remove

Removes from the underlying collection the last element returned by this iterator (optional operation). This method can be called only once per call to next() . The behavior of an iterator is unspecified if the underlying collection is modified while the iteration is in progress in any way other than by calling this method.

forEachRemaining

Performs the given action for each remaining element until all elements have been processed or the action throws an exception. Actions are performed in the order of iteration, if that order is specified. Exceptions thrown by the action are relayed to the caller.

 while (hasNext()) action.accept(next()); 

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2023, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

Источник

Interface Iterator

This interface is a member of the Java Collections Framework.

Method Summary

Performs the given action for each remaining element until all elements have been processed or the action throws an exception.

Removes from the underlying collection the last element returned by this iterator (optional operation).

Method Details

hasNext

Returns true if the iteration has more elements. (In other words, returns true if next() would return an element rather than throwing an exception.)

next

remove

Removes from the underlying collection the last element returned by this iterator (optional operation). This method can be called only once per call to next() . The behavior of an iterator is unspecified if the underlying collection is modified while the iteration is in progress in any way other than by calling this method, unless an overriding class has specified a concurrent modification policy. The behavior of an iterator is unspecified if this method is called after a call to the forEachRemaining method.

forEachRemaining

Performs the given action for each remaining element until all elements have been processed or the action throws an exception. Actions are performed in the order of iteration, if that order is specified. Exceptions thrown by the action are relayed to the caller. The behavior of an iterator is unspecified if the action modifies the collection in any way (even by calling the remove method or other mutator methods of Iterator subtypes), unless an overriding class has specified a concurrent modification policy. Subsequent behavior of an iterator is unspecified if the action throws an exception.

 while (hasNext()) action.accept(next()); 

Report a bug or suggest an enhancement
For further API reference and developer documentation see the Java SE Documentation, which contains more detailed, developer-targeted descriptions with conceptual overviews, definitions of terms, workarounds, and working code examples. Other versions.
Java is a trademark or registered trademark of Oracle and/or its affiliates in the US and other countries.
Copyright © 1993, 2023, Oracle and/or its affiliates, 500 Oracle Parkway, Redwood Shores, CA 94065 USA.
All rights reserved. Use is subject to license terms and the documentation redistribution policy.

Источник