75.Java异常处理机制-手动抛出异常

 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();
             }
         }
     }
 }