Help to calculate the size of arraylist..........

Question

class hdrFileFilter extends FileFilter {
private Hashtable filters = null;
private Hashtable noextensionfilter = null;
private String noextensionname=null;
private String extensionname = null;
private String description = null;
private String fullDescription = null;
private boolean useExtensionsInDescription = true;
private String fname = null;
public ArrayList noextensionarray=new ArrayList();
private File x;
int count=0;
int counthdr=0;
int i=0;     
     //all files are accepted.
public hdrFileFilter()
     this.filters = new Hashtable();
     //Creates a file filter that accepts files with the given extension.
public hdrFileFilter(String extension)
     this(extension,null);
     //Creates a file filter that accepts the given file type.
public hdrFileFilter(String extension, String description)
     this();
     if(extension!=null)
     addExtension(extension);
     if(description!=null) setDescription(description);
}      //Return true if this file should be shown in the directory pane,false if it shouldn't.
public boolean accept(File f) {
     if(f != null) {
     if(f.isDirectory()) {
          return true;
     String extension = getExtension(f);
     if(extension != null && filters.get(getExtension(f)) != null)
          fname=f.getName();
          extensionname=fname.substring(0,fname.lastIndexOf('.'));
          counthdr+=1;
          return true;
     if(extension == null)
          noextensionfilter=new Hashtable(20);
          noextensionname=f.getName();          
          noextensionfilter.put(count,noextensionname);
          count+=1;
          if(noextensionfilter.get(count) == extensionname)
               //noextensionarray=new ArrayList();
               x=f;
               noextensionarray.add(x);
               System.out.println("file:" +noextensionarray.get(i));                //i++;
               return true;               
     return false;
[b]public int get_size()
     int xx=noextensionarray.size();
     return xx;
     System.out.println("size is:" + noextensionarray.size());
     //Return the extension portion of the file's name .
public String getExtension(File f)
          if(f != null)
               String filename = f.getName();
               int i = filename.lastIndexOf('.');
               if(i>0 && i<filename.length()-1)
                    return filename.substring(i+1).toLowerCase();
          return null;
     //Adds a filetype "dot" extension to filter against.
public void addExtension(String extension)
     if(filters == null)
     filters = new Hashtable(20);
     filters.put(extension.toLowerCase(), this);
     fullDescription = null;
public String getDescription()
          if(fullDescription == null)
               if(description == null || isExtensionListInDescription())
                    fullDescription = description==null ? "(" : description + " (";
                    // build the description from the extension list
                    Enumeration extensions = filters.keys();
                    if(extensions != null)
                         Object nn=extensions.nextElement();
                         fullDescription += "." + nn;     
                         while (extensions.hasMoreElements())
                              fullDescription += ", ." + nn;
                    fullDescription += ")";
               else
                    fullDescription = description;
          return fullDescription;
public void setDescription(String description)
     this.description = description;
     fullDescription = null;
public void setExtensionListInDescription(boolean b) {
     useExtensionsInDescription = b;
     fullDescription = null;
          public boolean isExtensionListInDescription()
          return useExtensionsInDescription;
} //end of hdrfilefilter
class reference extends hdrFileFilter
reference()
here i need the size of noextensionarray array List
I've used method get_size() for the calculation of niextensionarray List in above class which is marked as bold.
since I've allocate memory to the array above the hdrFileFileter() so now the array list is showing the zero size of arraylist.
PLS. help me to get the size of arraylist noextensionarray.

Answer 1

Hello all,
the code contain two classes
1. hdrFileFilter: used to filter out files containing the extension .hdr and those files that haVE the same name as the header file has but with no extension.
files that have no extension are stored in the arraylist "noextensionarray".
2. Reference Class: this class is using the files that are stroed in the array List "Noextensionarray" one by one. for this I required the size of arraylist. I'm using the size of array through function get_size it gives the size=0;this function is defined in class hdrfilefilter.although it is diaplaying the name which are stored in arraylist on commad prompt.
I appricate all the comments given regarding the solution of the problem.
class hdrFileFilter extends FileFilter
     private Hashtable filters = null;
     private Hashtable noextensionfilter = null;
     private String noextensionname=null;
     private String extensionname = null;
     private String description = null;
     private String fullDescription = null;
     private boolean useExtensionsInDescription = true;
     private String fname = null;
     public ArrayList noextensionarray=new ArrayList();
     private File x;
     int count=0;
     int counthdr=0;
     int i=0;
     //all files are accepted.
     public hdrFileFilter()
          this.filters = new Hashtable();
     //Creates a file filter that accepts files with the given extension.
     public hdrFileFilter(String extension)
          this(extension,null);
     //Creates a file filter that accepts the given file type.
     public hdrFileFilter(String extension, String description)
          this();
          if(extension!=null)
          addExtension(extension);
          if(description!=null) setDescription(description);
     } //Return true if this file should be shown in the directory pane,false if it
shouldn't.
     public boolean accept(File f)
          if(f != null)
               if(f.isDirectory())
                    return true;
               String extension = getExtension(f);
               if(extension != null && filters.get(getExtension(f)) != null)
                    fname=f.getName();                         
          extensionname=fname.substring(0,fname.lastIndexOf('.'));
                    counthdr+=1;
                    return true;
               if(extension == null)
                    noextensionfilter=new Hashtable(20);
                    noextensionname=f.getName();
                    noextensionfilter.put(count,noextensionname);
                    count+=1;
                    if(noextensionfilter.get(count) == extensionname)
                              //noextensionarray=new ArrayList();
                              x=f;
                              noextensionarray.add(x);
                              System.out.println("file:"
noextensionarray.get(i)); //i+;
                              return true;
          return false;
     public int get_size()
          int xx=noextensionarray.size();
          return xx;
          System.out.println("size is:" + noextensionarray.size());
//Return the extension portion of the file's name .
     public String getExtension(File f)
          if(f != null)
               String filename = f.getName();
               int i = filename.lastIndexOf('.');
               if(i>0 && i<filename.length()-1)
                    return filename.substring(i+1).toLowerCase();
               return null;
//Adds a filetype "dot" extension to filter against.
     public void addExtension(String extension)
          if(filters == null)
               filters = new Hashtable(20);
          filters.put(extension.toLowerCase(), this);
          fullDescription = null;
     public String getDescription()
          if(fullDescription == null)
               if(description == null || isExtensionListInDescription())
                    fullDescription = description==null ? "(" :
description + " (";
                    // build the description from the extension list
                    Enumeration extensions = filters.keys();
                    if(extensions != null)
                         Object nn=extensions.nextElement();
                         fullDescription += "." + nn;
                         while (extensions.hasMoreElements())
                              fullDescription += ", ." + nn;
                    fullDescription += ")";
               else
                    fullDescription = description;
          return fullDescription;
     public void setDescription(String description)
          this.description = description;
          fullDescription = null;
     public void setExtensionListInDescription(boolean b)
          useExtensionsInDescription = b;
          fullDescription = null;
     public boolean isExtensionListInDescription()
          return useExtensionsInDescription;
} //end of hdrfilefilter
Class reference
REQUIRED THE SIZE OF ARRAYLIST.
}