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The moose likes Swing / AWT / SWT and the fly likes probem with populating JTable Big Moose Saloon
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probem with populating JTable

Pradeep Selvaraj
Greenhorn

Joined: Sep 29, 2003
Posts: 17
Hello there,

I am just looking for populating JTable from the ArrayList.I am trying to do that by get a NullPointerException.

here is the code snippet


Could any one plz help me out.Incase if my logic wrong can u guyz help me to populate records into JTABLE.

Thank you,

Pradeep
Craig Wood
Ranch Hand

Joined: Jan 14, 2004
Posts: 1535
Unless the Disk class has some method that returns its fields (instance variables) with an index or, as an array or, as a String that you can split into an array you'll have to hard–code the fields into the table columns as in the code below.

Instead of having the List list in class scope you could have createList return a reference to the list, ie

and send it into the getTable method as an argument. Either way, a reference to list must be available inside the getTable method or you get a NullPointer. NullPointer means "we can't find it!".

The stack trace that starts with "NullPointerException" will tell you the line number where the exception was thrown. Just count down the lines in your source code file to find out where the exception was thrown.
Pradeep Selvaraj
Greenhorn

Joined: Sep 29, 2003
Posts: 17
Thnx Craig.Thank you so much.It was really helpful.Your help is highly appreciated.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: probem with populating JTable