Java I/O How to - Filter a File List by name

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Question

We would like to know how to filter a File List by name.

Answer

/*from  w  ww .j a  v a  2s . c o m*/
import java.io.File;
import java.io.FilenameFilter;
import java.util.Date;

class FileListFilter implements FilenameFilter {
  private String name;
  private String extension;
  public FileListFilter(String name, String extension) {
    this.name = name;
    this.extension = extension;
  }
  public boolean accept(File directory, String filename) {
    boolean fileOK = true;
    if (name != null) {
      fileOK = filename.startsWith(name);
    }
    if (extension != null) {
      fileOK = filename.endsWith('.' + extension);
    }
    return fileOK;
  }
}
public class MainClass {
  public static void main(String[] args) {
    File myDir = new File("C:/");
    FilenameFilter select = new FileListFilter("F", "txt");
    File[] contents = myDir.listFiles(select);
    for (File file : contents) {
      System.out.println(file + " is a " + (file.isDirectory() ? "directory" : "file")
          + " last modified on\n" + new Date(file.lastModified()));
    }
  }
}

The code above generates the following result.

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