用File判断D盘下面是否还有txt文件

package cn.idcast;

import java.io.File;

public class File1 {
public static void main(String[] args) {
     File file = new File("d:\\");
     File[] F = file.listFiles();
     for (File f : F) {
         if (f.isFile()) {
             if (f.getName().endsWith(".txt")) {
                 System.out.println(f.getName());
             }
         }
     }
System.out.println("delete:"+file.delete());
}
}