Why there's error stating "unreported exception" when call function

Question

     public void actionPerformed(ActionEvent evt)
          Object obj = evt.getSource();
          if (obj == DeleteButton)
               readfile(); // Error here
               deletefile();
               rename();
========================================================================
     public void readfile() throws Exception
          BufferedReader in = new BufferedReader(new FileReader("WhiteCollar2.txt"));
          line=in.readLine();
          found=0;
          while (line!=null)
               if ((line.substring(0,6)).equals((String)textfield.getText()))
                    System.out.println("CORRECT\n");
                    found=1;
               else
                    writefile();                    
               line=in.readLine();
========================================================================
How come when I call the above readfile(), it gives me :
DeleteScreen.java:70: unreported exception java.lang.Exception; must be caught or declared to be thrown
readfile();
However if I change to the following :
try{readfile()};
catch (Exception e) {}
The code works fine. I am still figuring out on throwing exceptions etc. But how come I already throw exceptions it still complains exception not declared?
Thanks and Rgds

Answer 1

but the writefile() function which I called in the
read() also throw exception but how come I do not need
to catch it for the write()?The error message says it all: must be caught or declared to be thrown. Thus, you must either catch the exception using try-catch or you must declare that your method throws the exception using the throws declaration.
Your call to writefile() is in the method readfile() that already declares that it throws Exception. So there is no problem there.
BTW, you should know that it is generally ill-advised to catch or declare exception using the superclass Exception. You should use as specific an exception class as possible. In this case I suppose it would be IOException.