"The file has an unsupported compression type" issue - solved.

 "The file has an unsupported compression type" error message in Premiere Pro could be because you are trying to open .mkv file.

Adobe removed MKV support with the release of Adobe Premiere CC 2019 13.1.

So they leave wrong error message to trick their customers - they do support the compression, but they dont support the file container...

Great work, Adobe!

CountDownLatch

CountDownLatch is a Java Util type of synchronizer which allows one Thread to wait for one or more Threads before it starts processing.

CountDownLatch JavaDoc

Library vs Framework

Short: IoC 

The key difference between a library and a framework is "Inversion of Control". When you call a method from a library, you are in control. But with a framework, the control is inverted: the framework calls you.

Frameworks:

• jUnit
• TestNG
• Spring 
• PowerMock

Is PriorityQueue sorted?

PriorityQueue is not sorted. It is guaranteed that only the first element is "sorted" (PriorityQueue is specified only to return lowest element every time head is requested). The whole queue could be sorted, but this is not guaranteed.

So PriorityQueue iterator returns elements in any order, not in sorted order. Assuming sorted order is a common bug.

++ operator on variable used multiple times in single line

Write the output of this code:
        long l = 10;
        System.out.println( "l " + l++ + "; " + l );

Result:
l 10; 11

Database Partitioning

https://en.wikipedia.org/wiki/Partition_(database)

Java: Variables in interfaces

Concept of variables in interfaces is allowed in Java, but the concept is different. Variables defined in interfaces are always static and final.

Check this for more details.