Re: Java ME, why does this code throw an exception?

From:

"Andrew Thompson" <u32984@uwe>

Newsgroups:

comp.lang.java.programmer

Date:

Sun, 10 Jun 2007 07:33:49 GMT

Message-ID:

<737abe1b29b69@uwe>

Jeff wrote:

Java ME

I am not experienced with J2ME, but experience with
J2SE suggests a number of things that might be done
to trace the problem..

public class HelloWorld extends MIDlet implements CommandListener {
private String[] task;

public void commandAction(Command c, Displayable d) {

try {

    if (c == okCommand) {
          task[0] = "xxxxxx"; <--- crash here
          task[1] = "ddddddddd";
          task[2] = "eeeeeeeeee";
          try {
                Image iconGreen = Image.createImage("/icon-green.png");
                Image iconRed = Image.createImage("/icon-red.png");
                imageArray[0] = iconGreen;
                imageArray[1] = iconRed;
                imageArray[2] = iconGreen;
           } catch (java.io.IOException err) {

    // NEVER ignore exceptions in code that fails for
    // reasons not known!
    err.printStackTrace();

           }
           taskList = new List("My Tasks", Choice.IMPLICIT, task,
imageArray);
           taskList.addCommand(exitCommand);
           taskList.addCommand(okCommand);
           taskList.setCommandListener(this);
          display.setCurrent(taskList);

} catch (Exception e) {
// should catch the NPE (and all other exceptions)
e.printStackTrace();
}

}

HTH

--
Andrew Thompson
http://www.athompson.info/andrew/

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