package grapro;import javax.swing.filechooser.*;import java.io.File;public class JPGFilter extends FileFilter {  public JPGFilter() {  }  public boolean accept (File f) {    boolean acc = f.isDirectory();    if (!acc) {      String suffix = getSuffix(f);      if (suffix != null)         acc = suffix.equals("jpg");    }    return acc;  }  public String getDescription() {    return "JPG Files (*.jpg)";  }  public String getSuffix (File f) {    String s = f.getPath();    String suffix = null;    int i = s.lastIndexOf('.');    suffix = s.substring(i+1).toLowerCase();    return suffix;  }}