good websites to practice scala

https://www.scala-exercises.org/

http://aperiodic.net/phil/scala/s-99/

 

Coding Practice & Competion Websites

1. topcoder
   http://www.topcoder.com
   (a great blog: http://petr-mitrichev.blogspot.com/)
2. hackerrank
   hackerrank.com
3. leetcode
   leetcode.com
4. coderbyte
   coderbyte.com
5. geeksforgeeks
   geeksforgeeks.org
6. codeforces
   codeforces.com
7. codewars
   codewars.com
8. codeeval
   http://www.codeeval.com
9. spoj
   spoj.com
10. devdraft
    devdraft.com
11. codechef
    http://www.codechef.com
12. projecteuler
    projecteuler.net
13. hackerearth
    hackerearth.com
14. checkio
    py.checkio.org
15. codinggame
    codinggame.com
16. theaigames
    theaigames.com
17. programmr
    http://www.programmr.com

 

 

 

Intellij error: usage of api documented as @since…, Usage of API documented as @since 1.6+..

To get rid of the first one, you need to open up

File -> Project Structure -> Project Settings -> Modules -> "Your Module Name" -> Sources -> Language Level

and change that to the desired level i.e 1.8 or the Project Default language level

To fix the second one:

1. File > Settings > Build, Execution, Deployment > Java Compiler
2. Change Target bytecode version to 1.8 of the module that you are working for.

 

kill processes by image name in windows

from: http://tweaks.com/windows/39559/kill-processes-from-command-prompt/

example:

to kill all processes with an image name of chromedriver.exe, run

taskkill /IM chromedriver.exe /F

Intellij shortcuts

Jump to element’s declaration: command + B (Mac), control + B (PC)

 

Add oracle ojdbc to maven local repo

mvn install:install-file -Dfile=ojdbc7.jar -DgroupId=com.oracle -DartifactId=ojdbc7 -Dversion=12.1.0.2 -Dpackaging=jar

Full window shortcut in Intellij IDEA

control + shift + F12

enable system output in sqlplus or sqldeveloper

set serveroutput on

should enable DBMS_OUTPUT output in both environments.

Measure script execution time in sqlplus

before running the script, type: set timing on, then run your script, it should show elapsed time.

execute stored procedure in sqlplus and print results

assume a stored procedure my_proc(in_var varchar2, out_var sys_refcursor)

execute it in sqlplus

var v_cur ref cursor;

exec my_proc(‘var_val’, :v_cur);

print v_cur;