[Java] anonymous inner class issue

It seems that if an anonymous inner class implements an interface ,then its constructor can't have argument。If really need arguments, theorectically two solutions:

1. define a method which takes arguments (must be "final"). The method does nothing but return an anonymous class, which uses the method's arguments。



  public Destination dest(final String dest) {
    return new Destination() {
      private String label = dest;
      public String readLabel() { return label; }
    };
  }



2. see the exmaple below:



 import java.io.*;
 import java.util.*;

 abstract class NewFilenameFilter implements FilenameFilter{
     protected String start, end;
     NewFilenameFilter(String s, String e){
         start = s;
         end = e;
     }
 }

 public class NameFilter{
     public static void main(String argv[]){
         if(argv.length != 1){
             System.out.println("must have one argument!");
             System.exit(1);
         }
         File f = new File(argv[0]);
         if( !f.exists()){
             System.out.println(argv[0] + " does not exists");
             System.exit(1);
         }

         String s[] = f.list(new NewFilenameFilter("u", "c"){
             public boolean accept(File dir, String filename){
                 boolean isMatch = true;
                 isMatch &= filename.startsWith(start);
                 isMatch &= filename.endsWith("." + end);
                 return isMatch;
             }
         });
         /* print s */
     }
 }

However, if the class has the possibility to be used somewhere else, better give it a name。