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How do I get this to work?

Posted on 2007-11-23
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190 Views
Last Modified: 2013-11-23
I can't seem to get this to work. I keep getting the same error message... invalid method declaration; return type required...

Can anyone help?  

Also, will this code really work?
public class PQFinal extends MinHeap

{

  private Comparable[] theHeap;

  private int elems;

  private int cap = 10;

  private int priority;

  private int size;

  

  public static String MyPriorityQueue(int n)

  {

    Comparable[] arr = new Comparable[size];

    elems = 0;

    priority = 1;

  }

  

  public static String MyPriorityQueue()

  {

    Comparable[] arr = new Comparable[cap];

    priority = 1;

    elems = 0;

  }

  

  public boolean isFull()

  {

    if(elems == cap)

      return true;

    else

      return false;

  }

  

  public boolean isEmpty()

  {

    if(elems == 0)

      return true;

    else

      return false;

  }

  

  public boolean enqueue(Comparable o)

  {

  

  }

  

  public Object dequeue()

  {

    Object o = new Object();

    return o;

  }

  

  public static String MyMinHeap()

  {

    cap = 10;

    size = 0;

    theHeap = new Comparable[10];

  }

  

  public MyMinHeap(Comparable[] arr, int n)

  {

    size = n;

    cap = arr.length;

    theHeap = arr;

      return size;

  }

  

  public int getSize()

  {

    if(size != 0)

      return theHeap;

    return -1;

  }

  

  public boolean add(Comparable o)

  {

    if (o == null)

      throw new IlegalArgumentException();

      

    if(size >= theHeap.length - 1)

      theHeap = resize(elem);

      

    size++;

    theHeap[size] = o;

  }

  

  public Object removeMin()

  {

    if(size <= 0)

      return -1;

    swap(1, size--);

    shiftDown(1);

    return theHeap[size];

  }

  

  private void shiftDown(int index)

  {

    int lc = leftChild(i);

    int rc = rightChild(i);

    if(lc < size)

    {

      if((rc < size) && (theHeap[rc] > theHeap[lc]))

        lc = rc;

      if(theHeap[i] < theHeap[lc])

      {

        swap(i, lc);

        shiftDown(lc);

      }

    }

  }

  

  private void buildHeap()

  {

    for(int i = size; i >= 0; i++)

      shiftDown(i);

  }

  

  public void parseInts()

  {

    return data.parseInts();

  }

  

  public void parseStrings()

  {

    return data.parseStrings();

  }

}

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0
Comment
Question by:javalurnin
3 Comments
 
LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 20340314
 public MyMinHeap(Comparable[] arr, int n)

needs to be

  public void MyMinHeap(Comparable[] arr, int n)
0
 
LVL 7

Expert Comment

by:UrosVidojevic
ID: 20340327
 public PQFinal(Comparable[] arr, int n)
  {
    size = n;
    cap = arr.length;
    theHeap = arr;
      return size;
  }

If you wanted this method to be constructor...
0
 
LVL 92

Accepted Solution

by:
objects earned 250 total points
ID: 20340782
>  public boolean enqueue(Comparable o)
>  {

>  }

looks like that should be:

  public boolean enqueue(Comparable o)
  {
         return add(o);  
  }
0

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