Question
the code for the total is not working it gives me an error that says cannot invoke java.lang.Double.doubleValue() because the return value of java.
the code for the total is not working it gives me an error that says " cannot invoke java.lang.Double.doubleValue()" because the return value of java. swing.table.DefaultTableModel.getValueAt(int,int) is null.
my problem is that i want to add the price each time the user add book to the jtable. how should i fix it?
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Designing Data Intensive Applications The Big Ideas Behind Reliable Scalable And Maintainable Systems
Authors: Martin Kleppmann
1st Edition
1449373321, 978-1449373320
