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Message:

(null).equals(null) ???

Posted by Chin Loong on November 20, 2001 at 5:27 AM

Hiran,

probably u should change the code to be like this :

    BufferedReader fileIn = new BufferedReader(new FileReader("c:\\test.txt"));
    String taskNumber;
    while(!((taskNumber = fileIn.readLine())==null)) {  
        //some code}

yup, BufferedReader.readLine() will return null if it reaches end of file, but, when it returns null, u can't call the method equals() because null has no such method ;)

probably it ends the application completely because of NullPointerException.

any differing opinions?

• Opinions Matt Gerrans November 20, 2001 at 5:50 PM (14)
  • Thnx Hiran November 21, 2001 at 3:55 AM (13)
    • today in the LRT (light rail transit) Chin Loong November 21, 2001 at 6:11 AM (12)
      • Style Matt Gerrans November 21, 2001 at 4:03 PM (11)
        • Stylin' Matt Gerrans November 21, 2001 at 7:30 PM (10)
          • south park Chin Loong November 22, 2001 at 7:07 AM (0)
          • Personal preference Hiran November 22, 2001 at 12:44 AM (8)
            • mine Chin Loong November 22, 2001 at 6:55 AM (7)
              • Im with Hiran on this one Jody Brown November 22, 2001 at 12:49 PM (6)
                • Brace yourself Matt Gerrans November 22, 2001 at 3:10 PM (5)
                  • how can I start to learn java? Ying Chen January 26, 2002 at 12:25 AM (0)
                  • code formatters Jody Brown November 22, 2001 at 5:14 PM (1)
                    • But.... Hiran November 22, 2001 at 9:45 PM (0)
                  • code formatters Jody Brown November 22, 2001 at 5:07 PM (1)
                    • Code Formatter Matt Gerrans November 23, 2001 at 2:32 AM (0)