Alert warning

Question

Hello everyone,
So I'm having issues handling the commands of an alert of type warning. I want to allow a warining screen whenever DELETE or UNREGISTER is clicked.
Below is a snippet of my code.
Problem is when I click on CANCEL, the program goes on to DELETE/UNREGISTER regardless.
And when I click on OK, it continues with the action (DELETES/UNREGISTERS) but then produces a ClassCastException error immediately after.
public void commandAction(Command c, Displayable d){
                if(c==ok){
                    System.out.println("ok pressed");
//do nothing else return to where you were called from
                if (c== cancel){
//return to original screen
                    display.setCurrent(czUI);
                    System.out.println("cancel pressed");
else if (c != null){
                    try{
                        if (c==unregister){
                            warnDisplay("UNREGISTER will discard service. Do you wish to continue?");//this creates an Alert of type warning with the string parameter
                            warn.setCommandListener(this);
                            display.setCurrent(warn););//set display to warning
//continue if OK is clicked  on warning screen
                            //if OKed GO ON TO UNREGISTER, since OK is a NOP
                            System.out.println("abt to delete in cache");
                            cache.removeElementAt(selectedIndex);
                            System.out.println("deleted from cache");
                        if (c==refresh){
                            warnDisplay("REFRESH will COMPLETELY discard all foreign services. Do you wish to continue?");
                            warn.setCommandListener(this);
                            display.setCurrent(warn);//set display to warning
//continue if OK is clicked  on warning screen
                            //if OKed GO ON TO DELETE SINCE OK is a NOP
                            cache.removeAllElements();
                            refreshCache();
                        //print out what's in cache
                        cacheDisplay(czUI);
                    }catch(RecordStoreException e){
                        errorDisplay("Unable to locate service locally");
public void warnDisplay(String s){
        warn = new Alert("Warning: ", s, null, AlertType.CONFIRMATION);
        warn.addCommand(ok);
        warn.addCommand(cancel);
        warn.setTimeout(Alert.FOREVER);
        Many many thanks in advance,

Answer 1

Hi,
The reason may be because you have not put return statement after checking if c==ok.
after printing "ok pressed" it then checks if(c != null) which is true and hence calls the function cacheDisplay(czUI);
Put all the IF blocks in if..else
Prabhu.