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boolean accept(File file); 

boolean accept(File directory, String name); 

package com.generationjava.io.find;
import java.io.File;
import java.io.FileFilter;
public class ExtensionFileFilter implements FileFilter {
    private String extension;
    public ExtensionFileFilter(String extension) {
        this.extension = extension;
    }
    public boolean accept(File file) {
        if(file.isDirectory( )) {
            return false;
        }
        String name = file.getName( );
        // find the last
        int idx = name.lastIndexOf(".");
        if(index == -1) {
            return false;
        } else
        if(index == name.length( ) -1) {
            return false;
        } else {
            return this.extension.equals(name.substring(index+1));
        }
    }
}

...
String dir = "...";   // directory of your choice
File file = new File(dir);
File[] files = file.listFiles(new ExtensionFileFilter("cfg"));
// files variable is now c:\*.cfg if @#dir@# is c:\
// that is, all the files in the specified directory ending in *.cfg
...