Change Photo
Javon Leffler

Answers by Javon Leffler

Python - write() versus writelines() and concatenated strings?

writelines expects an iterable of strings write expects a single string. line1 + "\n" + line2 merges those strings together into a sin...

How to create a 3x3 grid, using opencv2 or PILLOW. similar to TIC-TAC-TOE??

from PIL import Image, ImageFont, ImageDraw im = Image.new('RGB', (300,300), (255,255,255)) dr = ImageDraw.Draw(im) # dr.rectangl...

vuforia image targets not recognized?

OK, I've figured out. I've seen in the log that I didn't update the license, and that solved it. ...

How to cast an Object to an int?

If you're sure that this object is an Integer : int i = (Integer) object; Or, starting from Java 7, you can equivalently write: int i ...

What is .dat certificate? How is it different from the other certificate format like JKS??

.dat is just a file extension that tells you nothing useful about the format of the file itself. There are two types of certificate files...

Java servlet: request.getParameter and request.setAttribute connected in a way I don't understand [duplicate]?

getParameter and getAttribute are completely unrelated. getParameter Returns the value of a request parameter as a String, or null if...

Trigger to block insert into SQL Server?

Remove the ROLLBACK from the trigger and raise and error with severity 11 or higher so that the stored procedure CATCH block is entered. T...

php e() and h() functions??

It looks like it might be CakePHP. See e() e (mixed $data) Convenience wrapper for echo(). This has been Deprecated and wil...

How to convert a MySQL DB to XML??

mysqldump --xml test > test.xml or mysqldump -X test > test.xml mysqldump to xml ...

How to update a JLabel text??

Try using setText(); with your JLabel. ...

How to break out or exit a method in Java??

Use the return keyword to exit from a method. public void someMethod() { //... a bunch of code ... if (someCondition()) { ...

Wait for 5 seconds?

just add one-liner with lambda (new Handler()).postDelayed(this::yourMethod, 5000); edit for clarification: yourMethod refers to the me...

How to filter JSON Data in JavaScript or jQuery??

This is how you should do it : ( for google find) $([ {"name":"Lenovo Thinkpad 41A4298","website":"google222"}, {"name":"Lenovo Think...

Correct Exceptions in C++?

"Correctly" is a value judgment, but (unlike other classes) there's a major benefit from exceptions classes being a monolithic hierarchy, ...

Add leading Zero Python [duplicate]?

You can use the builtin str.zfill method, like this my_string = "1" print my_string.zfill(2) # Prints 01 my_string = "1000" print my_s...