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9.0

Check TextField for null is throwing error

Asked by Arka3L in Java Programming Language

Tags: Java

Hey guys,

I was literally inches away from getting this working and I dont know where I've gone wrong...

I have made a simple java panel that is used for pounds and dollar conversion depending on rate. So I have a rate field, pound and dollar fields.
I want java to check for a field being empty, if so throw a JOptionPane alert. I got it to work at one point when the fields were default at 0, it was much easier to check a field for the presence of an integer at the time. What am I doing wrong?

Error: Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:994)

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             float pound, rate, result;
 
pound = Float.parseFloat(jTextField2.getText());
rate = Float.parseFloat(jTextField1.getText());
 
 
if (jTextField1.getText().equals("")){  // If the field is null, request the user to enter a number
 
    JOptionPane.showConfirmDialog((Component)
                null,  "Please enter a value for rate", "alert", JOptionPane.OK_CANCEL_OPTION);
}
else if (jTextField2.getText().equals("")){ // If the field is null, request the user to enter a number
       JOptionPane.showConfirmDialog((Component)
                null,  "Please enter a value for pounds", "alert", JOptionPane.OK_CANCEL_OPTION);
}
else
{
result = pound*rate;
jTextField3.setText(String.valueOf(result));
}
}

           
         

20091111-EE-VQP-92 / EE_QW_2_20070628

Check TextField for null is throwing error

Asked by Arka3L in Java Programming Language

Tags: Java

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