Creating a FileFilter
We need to implement the FileFilter class for creating a file filter. The FileFilter interface contains only one method accept(File). This method is used for checking whether a file should be included or excluded.
import java.io.File;
import java.io.FilenameFilter;
/**
*
* A file filter.
*
*/
class TextFileFilter implements FileFilter {
/**
* Pattern would contain the extension of
* the file.
*/
private String pattern;
/**
* Initializes the pattern.
*
* Provide the file extension to filter.
*
* @param pattern
*/
public TextFileFilter(String pattern){
this.pattern = pattern;
}
public boolean accept(File pathname) {
return pathname.getName().endsWith(this.pattern);
}
}
}
To invoke the above FileFilter create an object of the TextFileFilter class like
TextFileFilter filter = new TextFileFilter("txt");
The argument to TextFileFilter will be the extension of the file we need to include.
