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Posted to users@wicket.apache.org by Taught by S&M <qa...@gmail.com> on 2014/10/06 04:57:53 UTC
Re: how to handle null pointer exception while submit button
This code will help to handle exceptions when there is a single TextField:
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
<applet code="throwsDemo.class" height=250 width=300>
</applet>
*/
class FieldZeroException extends Exception
{
FieldZeroException()
{
}
public String toString()
{
return "Text field is empty.";
}
}
public class throwsDemo extends Applet implements ActionListener
{
Button b1;
TextField tf1,tf2;
Label l1,l2;
public void init()
{
setLayout(new FlowLayout(FlowLayout.LEFT));
l1=new Label("NULL");
l1.setForeground(Color.RED);
l2=new Label();
l2.setForeground(Color.GREEN);
tf1=new TextField(10);
b1=new Button("Check");
add(tf1);
add(b1);
add(l1);
add(l2);
b1.addActionListener(this);
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getSource()==b1)
{
String str1=tf1.getText();
int i=str1.length();
try
{
if(i==0)
{
throw new FieldZeroException();
}
else
{
l1.setText("Success");
}
}
catch(FieldZeroException fze)
{
l1.setText(fze.toString());
}
}
}
}
--
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Re: how to handle null pointer exception while submit button
Posted by Paul Bors <pa...@bors.ws>.
Must be the wrong mailing list, ignore :)
On Sun, Oct 5, 2014 at 11:15 PM, Warren Bell <wa...@clarksnutrition.com>
wrote:
> OK, a little confused, AWT, Applet ? Is Wicket up to something I haven’t
> heard about ?
>
> Warren
>
> On Oct 5, 2014, at 7:57 PM, Taught by S&M <qa...@gmail.com>
> wrote:
>
> > This code will help to handle exceptions when there is a single
> TextField:
> >
> > import java.awt.*;
> > import java.awt.event.*;
> > import java.applet.*;
> >
> > /*
> > <applet code="throwsDemo.class" height=250 width=300>
> > </applet>
> > */
> >
> > class FieldZeroException extends Exception
> > {
> > FieldZeroException()
> > {
> > }
> >
> > public String toString()
> > {
> > return "Text field is empty.";
> > }
> > }
> >
> > public class throwsDemo extends Applet implements ActionListener
> > {
> > Button b1;
> > TextField tf1,tf2;
> > Label l1,l2;
> >
> > public void init()
> > {
> > setLayout(new FlowLayout(FlowLayout.LEFT));
> > l1=new Label("NULL");
> > l1.setForeground(Color.RED);
> > l2=new Label();
> > l2.setForeground(Color.GREEN);
> > tf1=new TextField(10);
> > b1=new Button("Check");
> > add(tf1);
> > add(b1);
> > add(l1);
> > add(l2);
> > b1.addActionListener(this);
> > }
> >
> > public void actionPerformed(ActionEvent ae)
> > {
> > if(ae.getSource()==b1)
> > {
> > String str1=tf1.getText();
> > int i=str1.length();
> > try
> > {
> > if(i==0)
> > {
> > throw new FieldZeroException();
> > }
> > else
> > {
> > l1.setText("Success");
> > }
> > }
> > catch(FieldZeroException fze)
> > {
> > l1.setText(fze.toString());
> > }
> > }
> > }
> > }
> >
> > --
> > View this message in context:
> http://apache-wicket.1842946.n4.nabble.com/how-to-handle-null-pointer-exception-while-submit-button-tp4666392p4667826.html
> > Sent from the Users forum mailing list archive at Nabble.com.
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> > For additional commands, e-mail: users-help@wicket.apache.org
> >
> >
> > --
> > This email was Virus checked by Clark's Nutrition's Astaro Security
> Gateway.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>
Re: how to handle null pointer exception while submit button
Posted by Warren Bell <wa...@clarksnutrition.com>.
OK, a little confused, AWT, Applet ? Is Wicket up to something I haven’t heard about ?
Warren
On Oct 5, 2014, at 7:57 PM, Taught by S&M <qa...@gmail.com> wrote:
> This code will help to handle exceptions when there is a single TextField:
>
> import java.awt.*;
> import java.awt.event.*;
> import java.applet.*;
>
> /*
> <applet code="throwsDemo.class" height=250 width=300>
> </applet>
> */
>
> class FieldZeroException extends Exception
> {
> FieldZeroException()
> {
> }
>
> public String toString()
> {
> return "Text field is empty.";
> }
> }
>
> public class throwsDemo extends Applet implements ActionListener
> {
> Button b1;
> TextField tf1,tf2;
> Label l1,l2;
>
> public void init()
> {
> setLayout(new FlowLayout(FlowLayout.LEFT));
> l1=new Label("NULL");
> l1.setForeground(Color.RED);
> l2=new Label();
> l2.setForeground(Color.GREEN);
> tf1=new TextField(10);
> b1=new Button("Check");
> add(tf1);
> add(b1);
> add(l1);
> add(l2);
> b1.addActionListener(this);
> }
>
> public void actionPerformed(ActionEvent ae)
> {
> if(ae.getSource()==b1)
> {
> String str1=tf1.getText();
> int i=str1.length();
> try
> {
> if(i==0)
> {
> throw new FieldZeroException();
> }
> else
> {
> l1.setText("Success");
> }
> }
> catch(FieldZeroException fze)
> {
> l1.setText(fze.toString());
> }
> }
> }
> }
>
> --
> View this message in context: http://apache-wicket.1842946.n4.nabble.com/how-to-handle-null-pointer-exception-while-submit-button-tp4666392p4667826.html
> Sent from the Users forum mailing list archive at Nabble.com.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>
> --
> This email was Virus checked by Clark's Nutrition's Astaro Security Gateway.
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