Validation in textfield(numeric)

[Kamal Vaid]

Hello Everybody

I had problem ,how to validate the double or float in textfield
like (-123.45 or 45.56).Please tell me it urgent and implement
in project as I new java programmer but exception handling for numeric

thanks

[a albert77]

set as double

hope it helps

"Kamal Vaid" <vaidkamal@hotmail.com> wrote:
>
>Hello Everybody
>
>I had problem ,how to validate the double or float in textfield
>like (-123.45 or 45.56).Please tell me it urgent and implement
>in project as I new java programmer but exception handling for numeric
>
>thanks

[Bryan Baas]

"Kamal Vaid" <vaidkamal@hotmail.com> wrote:
>
>Hello Everybody
>
>I had problem ,how to validate the double or float in textfield
>like (-123.45 or 45.56).Please tell me it urgent and implement
>in project as I new java programmer but exception handling for numeric
>
>thanks

Here's a little code for you. What you want to do is use the Float "object
wrapper" parseFloat method and catch a NumberFormatException. Enjoy.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Test extends JFrame implements ActionListener
{
public Button enter = new Button("Enter");
public TextField textObj = new TextField(25);

Test()
{
getContentPane().setLayout(new FlowLayout());
enter.addActionListener(this);
getContentPane().add(textObj);
getContentPane().add(enter);
pack();
};

public void actionPerformed(ActionEvent evt)
{
String text = textObj.getText();

// validate the number here
try
{
float val = Float.parseFloat(text);
textObj.setText("Valid float entered");
}

// handle exception here
catch (NumberFormatException e)
{
textObj.setText("NumberFormatException"); }
};

public static void main(String[] args)
{
Test testObj = new Test();
testObj.show();
};

};