dirlistonly.java~2~

java2参考大全上的例子的源码和自己的理解.

package filenamefilter接口;

/**
 1.txt
 2.txt
 */

// Directory of .HTML files.
import java.io.*;

class OnlyExt
    implements FilenameFilter {
  String ext;

  public OnlyExt(String ext) {
    this.ext = "." + ext;
  }

  public boolean accept(File dir, String name) {
    return name.endsWith(ext);
  }
}

class DirListOnly {
  public static void main(String args[]) {
    String dirname = "java";
    File f1 = new File(dirname);
    FilenameFilter only = new OnlyExt("txt");
    String s[] = f1.list(only);

    for (int i = 0; i < s.length; i++) {
      System.out.println(s[i]);
    }
  }
}