get press enter event

[penny]

Hi,

i have a JTextField instance,
i enter some texts in the component.
i want to know how get the "press enter" event.
it is very convenience to do it vb or vc.
but how to do in java.
please give me a example...

Really thanks

[Tom Duffy]

Hello Penny:

Hitting enter is the default ActionPerformed event for a textfield. I usually
use inner classes to generate events but there are a number of ways to do
this. Just create a class that implements ActionListener and then implement
it for the textfield:

class MyAction implements java.awt.event.ActionListener{
public void actionPerformed(java.awt.event.ActionEvent event){
Object object = event.getSource();
if(object == MyTextField){
MyTextField_actionPerformed(event);
}
}
}

Then, register the event with an instance of your event class:
MyAction aMyAction = new MyAction();
MyTextField.addActionListener(aMyAction);

Finally, create the MyTextField_actionPerformed() event to actually do the
work:

void MyTextField_actionPerformed(java.awt.event.ActionEvent event){
//do some useful stuff
}

Many IDEs generate something like this for you. I use Visual Cafe and this
is a more generic example of the stuff that Cafe will generate for you.

Hope this helps,

Tom Duffy





"penny" <penny336@sinaman.com> wrote:
>
>Hi,
>
>i have a JTextField instance,
>i enter some texts in the component.
>i want to know how get the "press enter" event.
>it is very convenience to do it vb or vc.
>but how to do in java.
>please give me a example...
>
>Really thanks

[penny]

Oh really??
i just use jdk and textpad so i don't know.......
thanks

Alex
"Tom Duffy" <td4729@hotmail.com> wrote:
>
>Hello Penny:
>
>Hitting enter is the default ActionPerformed event for a textfield. I usually
>use inner classes to generate events but there are a number of ways to do
>this. Just create a class that implements ActionListener and then implement
>it for the textfield:
>
>class MyAction implements java.awt.event.ActionListener{
> public void actionPerformed(java.awt.event.ActionEvent event){
> Object object = event.getSource();
> if(object == MyTextField){
> MyTextField_actionPerformed(event);
> }
> }
>}
>
>Then, register the event with an instance of your event class:
>MyAction aMyAction = new MyAction();
>MyTextField.addActionListener(aMyAction);
>
>Finally, create the MyTextField_actionPerformed() event to actually do the
>work:
>
>void MyTextField_actionPerformed(java.awt.event.ActionEvent event){
> //do some useful stuff
>}
>
>Many IDEs generate something like this for you. I use Visual Cafe and this
>is a more generic example of the stuff that Cafe will generate for you.
>
>Hope this helps,
>
>Tom Duffy
>
>
>
>
>
>"penny" <penny336@sinaman.com> wrote:
>>
>>Hi,
>>
>>i have a JTextField instance,
>>i enter some texts in the component.
>>i want to know how get the "press enter" event.
>>it is very convenience to do it vb or vc.
>>but how to do in java.
>>please give me a example...
>>
>>Really thanks
>

[Andrew]

"penny" <penny336@sinaman.com> wrote:
>
>Hi,
>
>i have a JTextField instance,
>i enter some texts in the component.
>i want to know how get the "press enter" event.
>it is very convenience to do it vb or vc.
>but how to do in java.
>please give me a example...
>
>Really thanks

Add this listener to your JTextField:

JTextField text = new JTextField();
text.addKeyListener(new KeyListener());

...

public class KeyListener extends KeyAdapter {

public void keyPressed(KeyEvent evt) {
if (evt.getKeyCode() == KeyEvent.VK_ENTER) {

// whatever you want to happen when ENTER is pressed
System.out.println("press enter");
}
}

}