Java graphical user interface

Question

I want to add two strings in java by getting data from two input fields. Result is shown in the 3rd field. I am using this code, but netbeans shows an error:

float num1,num2,result;
num1=Float.parseFloat(jTextField1.getText());
num2=Float.parseFloat(jTextField2.getText());
result=num1+num2;
jTextField3.setText(String.valueOf(result));

This code is for Add button butt when I press button show lot of thread and in out put this message is show Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "Ahsan" at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1241) — user3315364
– user3315364, Commented Feb 16, 2014 at 6:59
Yes post the error and don't use the Netbeans GUI builder (IMO) — Smitty
– Smitty, Commented Feb 16, 2014 at 6:59
"Ahsan" is not a number. NumberFormatException clearly states that. — Paul Samsotha
– Paul Samsotha, Commented Feb 16, 2014 at 7:15
Maybe you're confusing which text fields are which. From the name of your variables, it looks like you're using GUI Builder. You should give your variables more semantic values like nameField so you know which one is which. You can do that by just right clicking the component from the design view and change variable name from the popup menu. — Paul Samsotha
– Paul Samsotha, Commented Feb 16, 2014 at 7:17

An SO User · Accepted Answer · 2014-02-16 07:16:05Z

2

Thrown to indicate that the application has attempted to convert a string to one of the numeric types, but that the string does not have the appropriate format.

You will get a NumberFormatException if the text you entered isn't a proper number.Surround the parseFloat() statements in try-catch block. "Ahsan" isn't a number and hence cannot be parsed.

Make this little modification to your code:

try{
   num1=Float.parseFloat(jTextField1.getText());
   num2=Float.parseFloat(jTextField2.getText());
   result=num1+num2;
   jTextField3.setText(String.valueOf(result));
}catch(NumberFormatException e){
   e.printStackTrace();
}

answered Feb 16, 2014 at 7:16

An SO User

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3 Comments

Paul Samsotha Over a year ago

But but, in farci, "Ashan" is translated to five, so why won't it work?! kidding. +1

An SO User Over a year ago

@peeskillet because swag. xD

user3315364 Over a year ago

Yes you are right but I want to add 2 strings and get as one string

AlexR · Accepted Answer · 2014-02-16 07:16:36Z

1

If you get NumberFormatException it can happen in one of these 2 lines:

num1=Float.parseFloat(jTextField1.getText());
num2=Float.parseFloat(jTextField2.getText());

More specifically it is thrown from Float.parseFloat(). You pass unparsable value to this method. Check what jTextField1.getText() or jTextField2.getText() return. I believe that these fields are empty or contain text that cannot be interpreted as legal float.

answered Feb 16, 2014 at 7:16

AlexR

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