Problems accessing my compareTo method

Question

Could you any one help me on this please.
I have 3 classes :
1- "Test class" that creates the object (works fine) and redefines compareTo method
2. "XListeChainee" that manage my linked list :
- insert a new node (problems) in order
3. "Test" which is the classe containing the main method. here is the code
class Test {
public static void test(){
XListeChainee liste = new XListeChainee();
liste.insererOrdonne(new TestClass("A"));
liste.insererOrdonne(new TestClass("B"));
liste.insererOrdonne(new TestClass("C"));
liste.insererOrdonne(new TestClass("E"));
liste.insererOrdonne(new TestClass("D"));
// ------- here is the main method
public static void main(String[] args){//main
Test obj = new Test();/
obj.test();
}//end main
here is the class TestClass with the compareTo method
class TestClass implements Comparable{
String data;
TestClass(String data)
this.data = data;
}//end constructor
public String toString(){
return (data);
public int compareTo(Object o) {
TestClass n = (TestClass)o;
int compData = data.compareTo(n.data);
return compData ;
}//end TestClass
and this is my XListeChainee class (some of the code)
public class XListeChainee
private Noeud premierNoeud; //reference to first node
private Noeud dernierNoeud; //reference to last node
boolean estVide(){
return premierNoeud == null;
// ------ Insert an object: in order
void insererOrdonne(Object element) {        
// Creates a new node with the new element
Noeud unNoeud;
unNoeud = new Noeud();
unNoeud.majElement(element) ;
if ( premierNoeud == null ) { // if first node = null
premierNoeud = unNoeud; // new node become first
//------------------------- problem------------------------------
//---- Compare the element in the first node with the element : Doesn't work
// ---- System says that cannot resolve symbol - compareTo
// This line says: if (firstNode.element.compareTo(element)>=0)
else if ( premierNoeud.obtenirElement().compareTo(element) >= 0 ) {
// Le nouvel element est < que le 1er element, alors il est inser� a la tete
unNoeud.majSuivant(premierNoeud);
premierNoeud = unNoeud;
else {
// Chercher la position du nouvel element dans la liste
Noeud parcourir; // un noeud pour parcourir la liste
Noeud prec; //un noeud toujour avant celui qui parcours la liste
parcourir = premierNoeud.obtenirSuivant();
prec = premierNoeud;
while (parcourir != null && parcourir.obtenirElement().compareTo(element) < 0) {
previous = parcourir;
parcours = parcourir.obtenirSuivant();
unNoeud.majSuivant(parcourir); // Insert newNode after previous.
prec.majSuivant(unNoeud);
Could you help me doing this please? I' sorry about some variable and method's names but I'm writing a program in french

Answer 1

[snip]
public int compareTo(Object o) {
TestClass n = (TestClass)o;
int compData = data.compareTo(n.data);
return compData ;
}//end TestClass[snip]
: if (firstNode.element.compareTo(element)>=0)
else if (
e if (
premierNoeud.obtenirElement().compareTo(element) >=0
) {What's up with the >=0 business in your method call?
Based on what your method expects (an Object) I
I don't know what you're trying to accomplish there?
Also, please use code tags.Nevermind, after staring at it I can see the closing paranthesis now.