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CursorListItr - @return true if the current position is...

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package DataStructures; // CursorListItr class; maintains "current position" // // CONSTRUCTION: Package friendly only, with a CursorNode // // ******************PUBLIC OPERATIONS********************* // void advance( ) --> Advance // boolean isPastEnd( ) --> True if at valid position in list // Object retrieve --> Return item in current position /** * Linked list implementation of the list iterator * using a header node; cursor version. * @author Mark Allen Weiss * @see CursorList */ public class CursorListItr { /** * Construct the list iterator * @param theNode any node in the linked list. */ CursorListItr( int theNode ) { current = theNode; } /** * Test if the current position is past the end of the list.
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Unformatted text preview: * @return true if the current position is null-equivalent. */ public boolean isPastEnd( ) { return current == 0; } /** * Return the item stored in the current position. * @return the stored item or null if the current position * is not in the list. */ public Object retrieve( ) { return isPastEnd( ) ? null : CursorList.cursorSpace[ current ].element; } /** * Advance the current position to the next node in the list. * If the current position is null, then do nothing. */ public void advance( ) { if( !isPastEnd( ) ) current = CursorList.cursorSpace[ current ].next; } int current; // Current position }...
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