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LAB B - public interface [email protected] [email protected] true or...

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public interface EntryWayListInterface { /** @param newEntry * @return true or false */ public boolean insertHead (Object newEntry); /** @param newEntry * @return true or false */ public boolean insertTail (Object newEntry); /** @return Object */ public Object deleteHead(); /** @return Object */ public Object deleteTail(); /** Task: Display list on the screen */ void display(); /** @param newEntry * @return integer value */ int contains(Object anEntry); /** @return true or false */ boolean isEmpty(); /** @return true or false */ boolean isFull(); } public class LList implements EntryWayListInterface { private Node firstNode ; private int length ; public LList(){ firstNode = null ; length = 0; } public int contains(Object anEntry) { Node currentNode = firstNode ; Node newNode = new Node(anEntry); int count = 0, position = 0; while (currentNode != null ){ count++; if (newNode. data == currentNode. data ) position = count; currentNode = currentNode. next ; } return position; } public Object deleteHead() { if (!isEmpty() && length > 1){ Node oldFirstNode = firstNode ;
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firstNode = firstNode . next ; length --; return oldFirstNode; } if ( length == 1) { firstNode . next = null ; length --; return
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