package testDate;

 import java.io.File;

 import java.io.FileNotFoundException;

 public class TestReadFile {

     public static void main(String[] args) {

         File f=new File("d:/b.txt");

         if(!f.exists()){

             try{

                 //手动抛出异常

                 throw new FileNotFoundException("File can't be found !");

             }catch(FileNotFoundException e){

                 e.printStackTrace();

             }

         }

     }

 }