Java File.list(FilenameFilter filter)方法

Java Java File.list(FilenameFilter filter)方法具有以下語法。

public String [] list(FilenameFilter filter)

範例

在下面的程式碼顯示如何使用File.list(FilenameFilter filter)方法。

import java.io.File;
import java.io.FilenameFilter;

public class Main{
  public static void main(String[] args) {

    File f = new File("C:/Python3");

    FilenameFilter filter = new MainFilenameFilter("txt");

    // array of files and directory
    String[] paths = f.list(filter);

    // for each name in the path array
    for (String path : paths) {
      System.out.println(path);
    }

  }
}
class MainFilenameFilter implements FilenameFilter {

  String str;

  // constructor takes string argument
  public MainFilenameFilter(String ext) {
    str = "." + ext;
  }

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

上面的程式碼生成以下結果。

LICENSE.txt
NEWS.txt
README.txt