Java.io.File

Question

Hello i created a class that extends java.io.File
public Class MyClass extends File
After i created instances of MyClass to populate a tree, i want to put a label ans icons for it and i proceed this way:
public String getText(Object element) {
          if(element instanceof MyClass) {
               return ((MyClass)element).getName();
          } else {
               System.out.println("element is not an instance of MyClass");
               return ((File)element).getName();
     }Someone can tell why it is not an instance of my class?

Answer 1

So is there somebody to help me please....
I got the root of my tree like this Session.getRoot()
Here is the code for Session
public class Session {
     private static MyClass logesco;
     public static final String PATH = System.getProperty("user.home") + File.separator;
     public Session() {
          super();
          logesco = new MyClass(PATH, "logesco");
          if(!logesco.exists() && !logesco.isDirectory()) {
               boolean success = logesco.mkdir();
               if(success) System.out.println("Fichier cr�� avec succ�");
               else System.out.println("Le fichier n'as pas �t� cr��");
          }else
               System.out.println("Le fichier existe d�ja");
     public static MyClass getRoot() {
          if(logesco == null) {
               System.out.println("null");
               logesco = new MyClass(PATH, "logesco");
               if(!logesco.exists() && !logesco.isDirectory()) {
                    boolean success = logesco.mkdir();
                    if(success) System.out.println("Fichier cr�� avec succ�");
                    else System.out.println("Le fichier n'as pas �t� cr��");
               }else
                    System.out.println("Le fichier existe d�ja");
          } else {
               System.out.println("non null");
               return logesco;
          return null;
     }and the code from MyClass class that extends java.io.File
public class MyClass extends File {
     private String theme;
     private String description;
     private String type;
     public MyClass(String arg0) {
          super(arg0);
          // TODO Auto-generated constructor stub
     public MyClass(String arg0, String arg1) {
          super(arg0, arg1);
          // TODO Auto-generated constructor stub
     public MyClass(File arg0, String arg1) {
          super(arg0, arg1);
          // TODO Auto-generated constructor stub
     public MyClass(URI arg0) {
          super(arg0);
          // TODO Auto-generated constructor stub
     public MyClass(String aPath, String aName, String aTheme) {
          super(aPath, aName);
          this.theme = aTheme;
     public MyClass(String aPath, String aName,
               String aTheme, String aDescription) {
          this(aPath, aName, aTheme);
          this.description = aDescription;
     public MyClass(LogescoProject parent, String aName,
               String aTheme, String aDescription) {
          this(parent, aName);
          this.theme = aTheme;
          this.description = aDescription;
     public String getTheme() {
          return this.theme;
     public String getDescription() {
          return this.description;
     public void setTheme(String aTheme) {
          this.theme = aTheme;
     public void setDescription(String aDescription) {
          this.description = aDescription;
     public void addProject(MyClass aProject) {
          // TODO Auto-generated method stub
          ArrayList<LogescoProject> projects = new ArrayList<MyClass>();
          projects.add(aProject);
     public boolean isProject() {
          return true;
     public MyClass createProject() {
          this.setTheme(theme);
          this.setDescription(description);
          if(!this.exists() && !this.isDirectory()) {
               boolean success = this.mkdir();
               if(success) System.out.println("Fichier cr�� avec succ�");
               else System.out.println("Le fichier n'as pas �t� cr��");
          }else
               System.out.println("Le fichier existe d�ja");
          return this;
     public void createProject(MyClass newProject) {
          newProject.setTheme(theme);
          newProject.setDescription(description);
          if(!newProject.exists() && !newProject.isDirectory()) {
               boolean success = newProject.mkdir();
               if(success) System.out.println("Fichier cr�� avec succ�");
               else System.out.println("Le fichier n'as pas �t� cr��");
          }else
               System.out.println("Le fichier existe d�ja");
     public String getType() {
          return this.type;
}