Applet : press any key to continue

Posted on 2003-10-22
Medium Priority
Last Modified: 2010-03-31
Hi experts,
I have written an applet that processes some datas, however, at one point, I need the user to press any key (or the enter key) to continue.
This is keyevent is not linked to any object like a button. I tried something like :
this.addKeyListener(new KeyAdapter() {
  public void KeyPressed(KeyEvent e) {
but this produce an extra file$1.class that bothers me (it needs to become a signed jar).
I tried playing with something like : if ( ev.id == Event.KEY_PRESS ) with no success.
I'm sure there's a simple way to write in an applet something similar to : while ((ch = (char)System.in.read()) !=...).
Thanks experts for your answer !

Question by:everfly
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Accepted Solution

savalou earned 80 total points
ID: 9599148
Why can't you include the file$1.class in your signed jar?

The file$1.class is generated because you're using an anonymous subclass of KeyAdaptor (new KeyAdaptor() {//this is an anonymous class...}).  To get around this you can write your own class like MyKeyAdaptor.java in which you extend KeyAdaptor.

Author Comment

ID: 9599535
Thanks savalou. Right, I included the file$1.class in my signed jar but adding "this.addKeyListener(new KeyAdapter() {public void KeyPressed(KeyEvent e) {}});" doesn't wait for me to press any key.
And also, isn't there a easier way to perfom this ?
LVL 92

Expert Comment

ID: 10194156
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

Accept savalou's comment as answer

Please leave any comments here within the next seven days.


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Expert Comment

ID: 10220786
How about this:

this.addKeyListener(new KeyAdapter() {
    public void KeyPressed(KeyEvent e) {

//add this bit where you want execution to stop:
boolean continue=false;
while (!continue) {}  //this will loop, until the KeyEvent allows the
                              //execution to continue.

I think that should solve it... The thing that you hadn't taken into account is that KeyListener runs in parallel with your code listening for Events, and if no event is assigned to it, nothing will happen to your main code's execution.  As for the extra class file, I think it's unavoidable but should cause any problems when you create a signed jar

Expert Comment

ID: 10220797
Sorry, read 'should not' in the last sentence

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