我编写了一个程序来读取特定文件，并且想知道如果找不到该文件该如何显示自定义消息。我目前没有的东西，有人可以解释为什么吗？

try {
       //create the file writer
       Fwrite = new FileWriter(file);
       Fwrite.write("Student Name \t\t\t Test Score \t Grade\n");
       for (int i = 0; i < size; i++) {
           Fwrite.write(students[i].getStudentLName() + "," + students[i].getStudentFName() + 
                   " \t\t\t "+ students[i].getTestScore() + " \t\t  " + students[i].getGrade() + "\n");
       }
       Fwrite.write("\n\nHighest Test Score: " + highestScore + "\n");

       Fwrite.write("Students having the highest test score\n");

       //writes the test scores in descending order
       for (int i = 0; i < size; i++) {
           if (students[i].getTestScore() == highestScore) {
               Fwrite.write(students[i].getStudentLName() + ",");
               Fwrite.write(students[i].getStudentFName() + "\n");
           }
       }

   //catches any errors
   } catch (IOException e) {
      System.err.println("File mot Found!");
      e.printStackTrace();
   }
   //try catch method to catch any errors
   System.out.println("File Complete!");
   //close file
   Fwrite.close();