import java.io.File;

import java.io.FilenameFilter;

public class Dir{

public static void main(String[] args){

if(args.length!=2){

System.err.println("usage: java Dir dirpath extension");

return;

}

File dir = new File(args[0]);

FilenameFilter filenameFilter = new FilenameFilter(){

@Override

public boolean accept(File dir, String name){

System.out.println("accept test: dir=" + dir + ", name=" + name);

return name.endsWith(args[1]);

}

};

String[] filenames = dir.list(filenameFilter);

System.out.println();

if(filenames!=null){ // may be null because of non-directory dir argument or IO error.

for(String filename: filenames){

System.out.println(filename);

}

}

}

}