I have a following code.
This code works fine. But
if ( balTxt.getText().trim( ).equals ( "") )
JOptionPane.showMessageDialog(this, "Enter your balance");
I got an empty string warning as below:
Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
at java.lang.Float.parseFloat(Unknown Source)
Duta, one more time, the code you provided is not the cause of the problem.
You get the Exception BECAUSE you SEND an empty string to sun.misc.FloatingDecimal.readJavaFormatString() method (see javadoc
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