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66 lines
2.7 KiB
66 lines
2.7 KiB
// This interface is taken from the Classpath project.
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// Please note the different copyright holder!
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// The changes I did is this comment, the package line, some
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// imports from java.util and some minor jdk12 -> jdk11 fixes.
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// -- Jochen Hoenicke <jochen@gnu.org>
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/////////////////////////////////////////////////////////////////////////////
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// Iterator.java -- Interface for iterating over collections
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//
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// Copyright (c) 1998 by Stuart Ballard (stuart.ballard@mcmail.com)
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Library General Public License as published
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// by the Free Software Foundation, version 2. (see COPYING.LIB)
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public License
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// along with this program; if not, write to the Free Software Foundation
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// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 USA
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/////////////////////////////////////////////////////////////////////////////
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package jode.util;
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/**
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* An object which iterates over a collection. An Iterator is used to return the
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* items once only, in sequence, by successive calls to the next method. It is
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* also possible to remove elements from the underlying collection by using the
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* optional remove method. Iterator is intended as a replacement for the
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* Enumeration interface of previous versions of Java, which did not have the
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* remove method and had less conveniently named methods.
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*/
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public interface Iterator {
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/**
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* Tests whether there are elements remaining in the collection.
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*
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* @return true if there is at least one more element in the collection,
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* that is, if the next call to next will not throw NoSuchElementException.
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*/
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boolean hasNext();
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/**
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* Obtain the next element in the collection.
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*
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* @return the next element in the collection
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* @exception NoSuchElementException if there are no more elements
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*/
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Object next();
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/**
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* Remove from the underlying collection the last element returned by next.
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* This method can be called only once after each call to next. It does not
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* affect what will be returned by subsequent calls to next. This operation is
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* optional, it may throw an UnsupportedOperationException.
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*
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* @exception IllegalStateException if next has not yet been called or remove
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* has already been called since the last call to next.
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* @exception UnsupportedOperationException if this Iterator does not support
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* the remove operation.
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*/
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void remove();
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}
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