How do I compare strings in Java?

== tests for reference equality (whether they are the same object). .equals() tests for value equality (whether they are logically “equal”). Objects.equals() checks for null before calling .equals() so you don’t have to (available as of JDK7, also available in Guava). Consequently, if you want to test whether two strings have the same value you … Read more

LEFT JOIN vs. LEFT OUTER JOIN in SQL Server

As per the documentation: FROM (Transact-SQL): The keyword OUTER is marked as optional (enclosed in square brackets). In this specific case, whether you specify OUTER or not makes no difference. Note that while the other elements of the join clause is also marked as optional, leaving them out will make a difference. For instance, the … Read more

How do I install opencv using pip?

I need to install cv2 for a script that has been written for me. I tried pip install cv2 and pip install open_cv and got the same problem – a warning message from dist.py and complains about zlib being not found. No cv2 installed. I also tried pyopenvc and pip install opencv-python. So, I went … Read more