Need help writtin to Bianry File!!Please advice!

[IrishNewbie]

Im getting the following error when i try to write a String to a binary file:
Exception in thread "main" java.lang.NullPointerException
at java.io.DataOutputStream.writeChars(Unknown Source)
at UpdateStock.OutArray(UpdateStock.java:105)
at UpdateStock.main(UpdateStock.java:87)

The string im trying to output is a variable in a "book" object.Any Idea on the Problem?????

 

[JavaDude32]

(1) is the variable you're trying to pass initialized (has it been assigned a value in each possible case that it can get to be written) ?

(2) Has your "book" Object been initialized and constructed?

(3) Is the variable you're trying to pass specifically a String or sub class of String?

Hope that helps

JavaDude32

 

[IrishNewbie]

Yep your rite,i had two methods for retreiving details and the one i was using wasnt initalizing the correct variables!!little things......Thanx!