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 <qaidjoharbarbh...@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.
>
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