[IO]判断文件或者目录是否存在

import java.io.*;

public class Test{

static void sop( Object obj){

System.out.println(obj);

}

public static void main(String args[]) throws Exception {

File f = new File("E:\\2.jpg");

if(f.exists()&&f.isDirectory()){ sop(" yes it'sdirectory");}

else if(f.exists()&&f.isFile()){sop("yes it's file");}

else sop("not exists");

}