java 读取指定文件夹下所有某格式文件（.csv为例）

package Ass3;  

import java.io.*;

public class Ass3 {

    //find csv from folder
    public void walk( String path ) {

        File root = new File( path );
        File[] list = root.listFiles();

        if (list == null) return;

        for ( File f : list ) {
            if ( f.isDirectory() ) {
                walk( f.getAbsolutePath() );
                System.out.println( "Dir:" + f.getAbsoluteFile() );
            }
            else {
                System.out.println( "File:" + f.getAbsoluteFile() );
            }
        }
    }

    public static void main(String[] args) {
        Ass3 fw = new Ass3();
        fw.walk("C:\\Users\\whisp\\eclipse-workspace\\Ass3\\Data" );
    }
}