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Thread: Is this correct? Tips if any please

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    Default Is this correct? Tips if any please

    Hello all, new to the forum and trying my best to finish an assignment for my intermediate java class and was hoping someone could tell me if what I am doing in my assignment is right or wrong. If it's wrong any suggestions would be much appreciated! It's an abstract class which is used for an ArrayList and LinkedList, and my question of correctness involves addFirst and extractFirst methods


    public abstract class List<E> implements Iterable<E> {
     
     
    public abstract void insertElementAt(E element, int index);
     
     
    public abstract E removeElementAt(int index);
     
    //	/**
    //	 * Returns a String representation of this List.
    //	 * @return a String representation of this List.
    //	 */
     
    //	
    //	/**
    //	 * Inserts the specified element at the beginning of this List.
    //	 * @param element the element to insert.
    //	 */
    	void addFirst(E element) {
    //		// TODO implement this method (Problem 1 (b))
     
    		int i = 0;
    		if(i == 0){
    		   List.this.insertElementAt(element,i);
    		}
    	}
     
    //	
    //	/**
    //	 * Retrieves and removes the first element of this List.
    //	 * @return the first element of this List.
    //	 */
     
    	E extractFirst() {
    		// TODO implement this method (Problem 1 (c))
     
    		int index = 0;
     
    		if(index==0)
    			return null;
     
    			E e = List.this.removeElementAt(index);
    		    index = index+1;
    		return e;
     
    	}
     
    }
    Last edited by helloworld922; October 8th, 2011 at 01:00 PM.


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    Default Re: Is this correct? Tips if any please

    someone could tell me if what I am doing in my assignment is right or wrong
    You tell us. You've given us no requirements, asked no specific question, and given us next to nothing to go by. Does it compile? Are there exceptions? Does it work as intended?

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