这个程序输出什么？
/* tButton.java
*
* Tabbed Focus Classes
* Copyright(C) 1996 by Bill Giel
*
* E-mail: rvdi@usa.nai.net
* WWW: http://www.nai.net/~rvdi/home.htm
*
***************************************************************************
* Abstract
* --------
* Overrides Button to provide action if ENTER is pressed when the
* tButton object has focus.
*
***************************************************************************
* THE AUTHOR MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY
* OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. THE AUTHOR SHALL NOT BE LIABLE
* FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
***************************************************************************/
import java.awt.*;
/** Overrides Button to provide action if ENTER is pressed when the
* tButton object has focus.
*/
public class tButton extends Button
{
static final int ENTER = 10;
/** Construct a tButton object with the supplied label.
*/
tButton(String label)
{
super(label);
}
/* Provides action by posting an ACTION_EVENT to the parent when
* ENTER is pressed and the tButton object has focus.
*/
public boolean handleEvent(Event e)
{
switch(e.id){
case Event.KEY_PRESS:
switch(e.key){
case ENTER:
postEvent(new Event(getParent(),Event.ACTION_EVENT,getLabel()));
return true;
}
}
return super.handleEvent(e);
}
}
