JDK: 1.2.2-D
OS: NT4.0
Locale: zh_CN

If we show GUI, like a frame, may contain a button or Choice in it, in a
thread that created by us, system will crash.
Following is a program to reproduce it:

============================CheckThread.java================================
import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class CheckThread {
    LittleThread myThread;

    public static void main(String args[]) {
new CheckThread();
    }

    public CheckThread() {
        myThread = new LittleThread();
        myThread.start();
    }

class LittleThread implements Runnable {
    
    Choice choice1;
    int itemCount = 0;
    boolean PAUSE = false;
    Thread driver = null;

    public LittleThread() {
        Frame f = new Frame("Check Choice");
        f.setLayout(new BorderLayout());
        choice1 = new Choice();
        f.add(choice1, BorderLayout.CENTER);
        f.pack();
        f.show();
    }

    public void start() {
if (driver == null) {
driver = new Thread(this, "");
driver.start();
}
    }


    public void run() {
        while (true) {
            if (choice1 != null && itemCount < 40) {
                choice1.add("I am Choice, yes I am : " + itemCount * itemCount);
                itemCount ++;
            }
            if (itemCount >= 20 && choice1 != null && choice1.getItemCount() > 0) {
                choice1.removeAll();
                itemCount = 0;
            }
            try {
                Thread.sleep(1000);
            } catch (Exception ex) {
            }
        }
    }
}

}
================================================================================

Run this program in NT4.0 (Simplified Chinese Version),
it will call java to crash, I am not sure whether
it exists in NT4.0 English version.


jim.hu@prc 1999-01-25