Java Development

[Himanshu_berry]

i am doing this to print "hello " 10 times in  my textbox but it prints only one time.

plz check this

class ThreadUi extends MainScreen implements FieldChangeListener
{
public ButtonField start, stop;
public TextBoxField txtfield =null;
public String str = "";
public ThreadUi()
{
ThreadScreen();
}

public void ThreadScreen()
{
HorizontalFieldManager hfm = new HorizontalFieldManager(HorizontalFieldManager.FIELD_HCENTER);
hfm.setMargin(40,0,0,0);
start = new ButtonField("Start");
start.setMargin(0,10,0,0);
stop = new ButtonField("Stop");
hfm.add(start);
hfm.add(stop);
add(hfm);

txtfield = new TextBoxField(400,400);
txtfield.setMargin(20,0,0,20);
add(txtfield);

start.setChangeListener(this);
stop.setChangeListener(this);
}

public void startThread()
{
Thread th = new Thread()
{
public void run()
{
try
{
Thread.currentThread().sleep(1000);
}
catch(InterruptedException e){}
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
for(int i = 0; i<10;i++)
{
str = "hello";
txtfield.setText(str);
}

}
});
}
};
th.start();
}

public void fieldChanged(Field field, int context)
{
if(field == start)
{
startThread();
}

else if(field == stop)
{

}

else
{
}
}

}

[simon_hain]

well, your thread sleeps for 1 second, then sets "hello" to the textfield 10 times in a row.
maybe you should take a second look at your process flow...

[Himanshu_berry]

your means should display first 

then sleep.

[Himanshu_berry]

it is showing only one hello look.

[maadani]

Read carefully simon's post.

You update the same(!!!) text field with the same text so it doesn't really change...

Try adding more text fileds or changing the value of the text field to include the old text with the new text:

setText(getText() + "\n" + "hello");

[simon_hain · Accepted solution]

no, i mean your code does not make any sense.
if you call setText it sets the text of the field. if you do that 10 times in a row it still gets the same result. you could use "hello"+i, that way it would at least print the index with it.

if you want to sleep between the setText statements you have to put the for loop on the outside, and a sleep and invokelater on the inside.

this forum is mainly for the specialities of blackberry java, if you want to learn java development i suggest to take a look at some online courses, starting on BB directly is quite difficult.

[Himanshu_berry]

i ll try to do course.

thanks

[Himanshu_berry]

Thanks

mr.simon

i got the solution finally.

[simon_hain]

good to hear!
please mark the thread as solved, then