-----------------------------------

Aziz

Sat Jun 25, 2005 7:56 pm


BufferedReader error?

-----------------------------------

Why does this code:

/* Class "ScheduleManager"
 * Includes methods to write and read work schedules
 * for McDonald's employee.
 */
 
 import java.util.*;
 import java.io.*;
 
 public class ScheduleManager
 { 	
 	//Vector to store strings of scheduled days
 	Vector days = new Vector(0,1);
 	
 	//Method to get the schedule 
 	private void readSchedule () throws IOException
 	{
 		//Input object
 		BufferedReader input;
 		
 		//Input line
 		String line;
 		
 		//Declares input stream from 
 		input = new BufferedReader(new FileReader("schedule.dat"));
 		
 		while (true)
 		{
 			line = input.readLine();
 			if (line == null) break;
 			days.add(line);
 		}
 		
 		input.close();
 	} 
 }

give my this compile-time message:

--------------------Configuration: --------------------
Note: C:\Documents and Settings\Anthony\My Documents\Java\Schedule Manager\ScheduleManager.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

Process completed.



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wtd

Sat Jun 25, 2005 10:05 pm



-----------------------------------

Let me clear up something first.  In Java you need not declare an object and initialize it separately.

BufferedReader input = new BufferedReader(
   new FileReader("schedule.dat"));

That works just fine and saves you a line of code.


-----------------------------------

1of42

Sun Jun 26, 2005 12:41 am



-----------------------------------

I'm not 100% sure why it says that - maybe drawing to your attention unchecked exceptions that you are not explicitly dealing with (despite the throws clause)?

It compiles without warnings for me though, so I'd say you're fine to work with the code.


-----------------------------------

Aziz

Mon Jun 27, 2005 1:10 am



-----------------------------------

Thanks a bunch. And yeah, in the HighScoreList class I've been working on today (converted from Turing, java makes it much better :)) i've been doing it in one statement, and no warnings like that. But it did compile fine and everything so I was guessing it was a warning. But to be on the save side. :P


-----------------------------------

Hikaru79

Sun Jul 17, 2005 10:04 pm



-----------------------------------

Try doing what the error says. It says to try recompiling with the -Xlint:unchecked flag, so do so, and this is what you get:
$ javac -Xlint:unchecked *.java
ScheduleManager.java:30: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.Vector
          days.add(line);
                  ^
1 warning
Basically, you're not checking for a certain exception in the vector's add(E) method. This one throws a bunch of unchecked exceptions so I'm not sure which one its complaining about, but ClassCastException is the most likely candidate. Try catching that and see what happens :)