Pls Help asap

Question

Hi
I have an assignment due today at midnight, I need some help please please....
the assignment is about implementing a tow-dimensional sparsearrays using LinkedList
here is what I've got so far and I am not even sure
import java.*;
public class SparseMatrix implements SparseMatrixInterface{
//members
     private Object defaultValue = 0;
     private List[] rowHead = null;
     private List[] colHead = null;
     private List current = null;
     private List previous = null;
     private Object value = null;
//constructor
     public SparseMatrix(int rIndex, int cIndex)
          if(rIndex <= 0) System.exit(rIndex);
          if(cIndex <= 0) System.exit(cIndex);
          rowHead = new List[rIndex];
          colHead = new List[cIndex];
//SparseMatrixInterface
//iterateRow(), iterateCol() should return another iterator
     @Override
     public Object defaultValue() {return defaultValue;}
     @Override
     public RowIterator iterateRow() {return null;}
     @Override
     public ColIterator iterateCol() {return null;}
     @Override
     public Object fetch(int row, int col) {
          do{
          if((row == current.row) && (col == current.col)) {return current.value;}
          current =  current.next;}
          while(row < current.row && col <  current.col && current.next != defaultValue);
          return defaultValue;}
     @Override
     public void store(int row, int col, Object value) {}
//methods
     private void display(){int count = 0; List value; System.out.println();}
     private void addRow(int rIndex, Object value){}
     private void addColumn(int cIndex, Object value){}
     private int getRowCount(int cIndex){return List[rIndex].length;}
     private int getColumnCount(int cIndex){return List[cIndex].length;}
//Colterator class
//next() should return another iterator
     private class Colterator
          public boolean hasNext() {return current != null && current.next != null;}
          public ElementIterator next() {return null;}
//RowIterator class
//next() should return another iterator
     private class RowIterator
          public boolean hasNext() {return current != null && current.next != null;}
          public ElementIterator next() {return null;}
//ElementIterator
//iteratingRow() true if a call to next from ColIterator
//iteratingCol()   true if a call to next from RowIterator
     private class ElementIterator implements MatrixInterface
         public boolean iteratingRow() {return true;}
         public boolean iteratingCol() {return true;}
         public int nonIteratingIndex() {
              if (iteratingRow())return rIndex();
              if (iteratingCol())return cIndex();
               return 0;}
          public boolean hasNext() {
               return current.getRow() != 0 && current.next.getRow() != 0
                    || current.getCol() != 0 && current.next.getCol() != 0;}
          public MatrixInterface next() {
               if(hasNext() == true) previous = current; current = current.getNext();
               return (MatrixInterface) current.value;}
//MatrixInterface
         public int rIndex() {return current.getRow();}
         public int cIndex() {return current.getCol();}
         public Object value() {return null;}
//nested class
     private class List{
          private List next = null;
          private int row = 0;
          private int col = 0;
          private Object value = null;
          public void setNext(List next)          {this.next = next;}
          public void setRow(int row)          {this.row = row;}
          public void setCol(int col)          {this.col = col;}
          public void setValue(Object value)  {this.value = value;}
          public List getNext()               {return next;}
          public int getRow()               {return row;}
          public int getCol()               {return col;}
          public Object getValue()          {return value;}
}please fill in the missing parts
I really appreciate it.
you can email me at [email protected]

Answer 1

Let me just post a couple of important parts of the [FAQ's|http://wikis.sun.com/display/SunForums/Forums.sun.com+FAQ] of Sun's forum:
Be thorough and precise: Proofread your question before posting. Describe the steps that you have taken. The more effort you put into researching and describing your problem, the more likely you will get a sincere effort in return.
Post a subject line that describes the problem: Experts in your subject may skim right past subject lines like "Urgent" and "Need help ASAP". Use keywords about the technologies instead.
Post a problem, not an assignment: Break your assignment down into specific problems that you can ask for help with. Dorm hall lounges may be a better resource if you have a last minute, "urgent" demand for solutions to homework problems.