I have a Swing JTextBox
that basically will hold a double.
I find that using:
Double.parseDouble(this.myTB.getText());
will throw an exception (and thus program is terminated) whenever Double.parseDouble()
gets invalid input.
My question: is there an easy way to NOT throw an exception, and instead return an integer (-1)
saying that parseDouble() failed?
I am trying to make a popup for the user saying he or she's data field is invalid.
Thanks
EDIT:
Thanks lol. How could I forget about catching exceptions? it's been a long day!
The best way to handle this is by using a try/catch block.
try {
return Double.parseDouble(this.myTB.getText());
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog("Oops");
return -1;
}
The JOptionPane
is a great way to display warning messages to users.
Catch the NumberFormatException
, and return your desired error value (or take some other action from within the catch clause).
double value = -1;
try {
value = Double.parseDouble(this.myTB.getText());
} catch (NumberFormatException e) {
e.printStackTrace();
}
return value;
Use
try{
return Double.parseDouble(this.myTB.getText());
} catch(NumberFormatException e) {
return -1;
}
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