balh

[darkessenz21]

I have a nested class

public class BST{

private class NodeQueue extends Queue{ ETC ETC

public Comparable addThis(){
return((Queue)this).peek());}


}


}

peek() is defined in QUEUE, but I cannot get it to recognize this method in the nested class.

Any ideas why it woudn't recognize an inherited method?

 

[darkessenz21]

I tried casting the nested class as its parent, but it still won't recognize the method. ARGGHH

 

[Daishiki]

for NodeQueue's constructor, did you include super(any paremeters of Queue); ?
i'm not sure if you have to cast it to it's parent on the return, since i think it is technically a type of queue

 

[darkessenz21]

I think you might be right about the super call-I am going to try and fix my constructor.

 

[darkessenz21]

My Queue Constructor has only one paramater

public Queue(Comparable c){head.data=c;}
...................

NodeQueue extends Queue{
NodeQueue(Comparable c){super(c);}
..................

Do I need a default constructor?

 

[Kilrsat]

This:

Originally posted by: darkessenz2
public Comparable addThis(){
return((Queue)this).peek());}


}

Should be:

public Comparable addThis() {
return this.peek();
}

Or:

public Comparable addThis() {
return peek();
}

 

[darkessenz21]

No matter what I do, it still says cannot resolve symbol when I call

this.peek();
or
peek();

 

[darkessenz21]

I have even tried creating a new object of type Queue, within the Nested Class and I still get the CANNOT resolve symbol error

for example


public class Queue{ public void enqueue(Comparable){etc etc, does some stuff}}
**********************************NEW FILE**********************

public class BST{

class Node{
Queue dataQueue;

public void add(Comparable c){
dataQueue.enqueue(c);} <============ Why does this give me "Cannot resolve symbol Enqueue"

}

}

 

[Kilrsat]

Are you sure peek() and enqueue() are public members of the Queue class?

 

[darkessenz21]

for sure-

public void enqueue(Comparable c){etc}

This is from Queue.

 

[Daishiki]

Originally posted by: darkessenz2
for sure-

public void enqueue(Comparable c){etc}

This is from Queue.

this Queue... did you write it yourself or are you trying to use the API? Couldn't find it on Sun's site.
From my book:
"The Collections API provides a Stack class but no queue class. The STack methods are push, pop, and seek. However, teh STack class extends Vector and is slower htan it needs to be; like Vector it is no longer in vogue and can bereplaced with List operations. The queue operations must be done using a LinkedList(e.g., addLast, removeFirst, and getFirst)."

 

[darkessenz21]

I wrote it- it is pretty basic.

Steve

Okay Here is the real problem. My BST class can not access ANYTHING from the Queue code that I wrote. It is like it needs to be imported, but I didn't think I needed to-because Java does that automatically.

 

[manly]

You need to import if they're in separate packages.

 

[Daishiki]

make sure the spelling, capitalizations, parameters match for enqueue()
other than that, nothing's coming to mind unless i see it all