Im experiencing a problem in parsing jTextfield
into float
value so i can perform operation but its giving number format exception
Here is the Error
Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1011)
at java.lang.Float.parseFloat(Float.java:452)
and this is what im doing
float T1 = Float.parseFloat(txt_T1_f.getText());
You can add a check on the text value like this:
String text = txt_T1_f.getText();
if (text != null && !text.isEmpty()) {
float T1 = Float.parseFloat(text);
}
Before converting to float, check your string is not empty and not null. You are getting excepting since your string is empty.
use
if(txt_T1_f.getText()!=null && !txt_T1_f.getText().isEmpty())
float T1 = Float.parseFloat(txt_T1_f.getText());
First you should check your string to find out is it a float at all? try this:
String regex="^([+-]?\\d*\\.?\\d*)$";
String input = txt_T1_f.getText();
float T1 ;
if(Pattern.matches(regex, input)){
T1 = Float.valueOf(input);
}
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