Please help!! I'm stuck with java code...API not helping.

[BlueroY]

hi, I'm working on an exercise, i did a lot of work already and i just can't figure where I'm going wrong, this is what I'm trying to achieve

Sample IO
*************** *************** *************** *************** *************** ****

Welcome to PeopleSoft 2
MENU: (A)dd student, (D)elete, (L)ist, (S)ort, e(X)it
a
Enter the student number
MSXMIC001
Enter the name
Mickey Mouse
Done
MENU: (A)dd student, (D)elete, (L)ist, (S)ort, e(X)it
a
Enter the student number
CHPALV001
Enter the name
Alvin the Chipmunk
Done
MENU: (A)dd student, (D)elete, (L)ist, (S)ort, e(X)it
a
Enter the student number
DCKDON002
Enter the name
Donald Duck
Done
MENU: (A)dd student, (D)elete, (L)ist, (S)ort, e(X)it
l
Student: DCKDON002, Donald Duck
Student: CHPALV001, Alvin the Chipmunk
Student: MSXMIC001, Mickey Mouse
Done
MENU: (A)dd student, (D)elete, (L)ist, (S)ort, e(X)it
s
Done
MENU: (A)dd student, (D)elete, (L)ist, (S)ort, e(X)it
l
Student: CHPALV001, Alvin the Chipmunk
Student: DCKDON002, Donald Duck
Student: MSXMIC001, Mickey Mouse
Done
MENU: (A)dd student, (D)elete, (L)ist, (S)ort, e(X)it
d
Enter the student number
DCKDON002
Done
MENU: (A)dd student, (D)elete, (L)ist, (S)ort, e(X)it
l
Student: CHPALV001, Alvin the Chipmunk
Student: MSXMIC001, Mickey Mouse
Done
MENU: (A)dd student, (D)elete, (L)ist, (S)ort, e(X)it
x

*************** *************** *************** *************** ***
and this is my code so far, that won't work....
*************** *************** *************** *************** *************** *************** *
[code=java]import java.util.NoSuc hElementExcepti on;
import java.util.Scann er;

public class LinkedList2
{ private class Node
{
private String name;
private String stuName;
private Node link;


public Node()
{
link = null;
name = null;
stuName = null;
}

public Node(String newStuName, String newName, Node linkValue)
{
setData(newStuN ame, newName);
link = linkValue;
}
public void setData(String newStuName, String newName)
{
name = newName;
stuName = newStuName;
}
public void setLink(Node newLink)
{
link = newLink;
}
public String getStuName()
{
return stuName;
}
public String getName()
{
return name;
}
public Node getLink()
{
return link;
}
}//end of node inner class

public class List2Iterator//inner class for iterators for linkedlist2
{
private Node position;
private Node previous;

public List2Iterator()
{
position = head;
previous = null;
}
public void restart()
{
position = head;
previous = null;
}
public String next()
{
if(!hasNext())
throw new NoSuchElementEx ception();
String toReturn = position.stuNam e;
previous = position;
position = position.link;
return toReturn;
}
public boolean hasNext()
{
return(position != null);
}
public String peek()
{
if(!hasNext())
throw new IllegalStateExc eption();
return position.stuNam e;
}
public void addHare(String newData)
{
if(position == null && previous != null)//if at end o list

previous.link = new Node(newData, null);
else if(position == null || previous == null)
LinkedList2.thi s.addToStart(ne wData);

else{
Node temp = new Node(newData, position);
previous.link = temp;
previous = temp;
}
}
public void changeHare(Stri ng newData)
{
if(position == null)
throw new IllegalStateExc eption();
else
position.stuNam e = newData;
}
public void delete()
{
if(position == null)
throw new IllegalStateExc eption();
else if(previous == null)
{
head = head.link;
position = head;
}
else
{
previous.link = position.link;
position = position.link;
}
}
}
private Node head;

public List2Iterator iterator()
{
return new List2Iterator() ;
}
public LinkedList2()
{
head = null;//adds node at the stat of the list with the specified data
}
public void addToStart(Stri ng itemStuName, String itemName)
{
head = new Node1(itemStuNa me, itemName, head);
}
}
public boolean deleteHeadNode( )
{
if(head != null){

head = head.link;
return true;
}
else
return false;
}
/*public int size()//return number of nodes in the list
{
int count = 0;
Node position = head;
while(position != null)
{
count++;
position = position.link;
}
return count;
}*/
public boolean contains(String stuName, String name)
{
return (find(stuName, name) != null);
}
private Node find(String target)
{
Node position = head;
String itemAtPosition;
while (position != null)
{
itemAtPosition = position.stuNam e;
if(itemAtPositi on.equals(targe t))
return position;
position = position.link;
}
return null; //target wan not found
}
public void outPutList()
{
Node position = head;
while(position != null);
{
System.out.prin tln(position.st uName);
position = position.link;
}
}
public boolean isEmpty()
{
return(head == null);
}
public void clear()
{
head = null;
}
public boolean equals(Object otherObject)
{
if(otherObject == null)
return false;
else if(getClass() != otherObject.get Class())
return false;
else{
LinkedList2 otherList = (LinkedList2)ot herObject;
if(size() != otherList.size( ))
return false;
Node position = head;
Node otherPosition = otherList.head;
while(position != null)
{
if((!(position. item.equals(oth erPosition.stuN ame))))
return false;
position = position.link;
otherPosition = otherPosition.l ink;
}
return true;//a mis match was not found
}
}


public static void main(String[] args)
{
Scanner keyboard = new Scanner(System. in);

LinkedList2 list = new LinkedList2();
LinkedList2.Lis t2Iterator i = list.iterator() ;

System.out.prin tln("Welcome to PeopleSoft 2");

int choice = keyboard.nextIn t();
while(choice !== 5)
{
System.out.prin tln("MENU: (A)dd student, (D)elete, (L)ist, (S)ort, e(X)it");
switch(choice)
{
case 1:
System.out.prin tln("Enter the student number");
stuNum = keyboard.next() ;
System.out.prin tln("Enter the Student name");
name = keyboard.next() ;
list.addToStart (studentNum,nam e);
System.out.prin tln("Done");
break;

case 2:
System.out.prin tln("Enter student number");
stuName = keyboard.next() ;
i.restart();
i.next();
System.out.prin tln("Will delete the node for; " + i.peek());
i.delete();
System.out.prin tln("Done");
break;

case 3:
System.out.prin tln("list now contains:");
i.restart();
while(i.hasNext ())
System.out.prin tln("Student: " + i.next());
System.out.prin tln();
System.out.prin tln("Done");
break;

case 5:
System.exit(0);
break;

default:
System.out.prin tln("Error,plea se check your input again");
break;
}
}



}


}[/code]
*************** *************** *************** *************** *************** *************** **
please help me see where I'm going wrong.

[JosAH]

and this is my code so far, that won't work....

What doesn't work? We are not going to do your homework for you but we're
willing to help you to solve any problem; please help us to help you and specify
what doesn't actually work.

kind regards,

Jos

[BlueroY]

hi again, sorry I did not give enough information,
when i compile, I get about 70 lines of errors saying "enum expected" what i really have trouble with is letting the user enter all the information. I'm also having trouble writing a suitable delete() method....the one in my code is from my textbook example, actualy almost of all the code...all I really need is how do let the user enter all the data and do I need an array for (studentNumber and name)?..I'm a bit frustrated now.

[JosAH]

If your program doesn't compile you definitely can't run it. Can you show us the
first compiler error diagnostic? (copied verbatim, including the offending line number).

kind regards,

Jos