Java online compiler

- Sololearn of course, useful by web page, but with app suitable for mobiles too with good prg. editor and community support. (Java 10) - gdb, with debbuger, and editable files for data input. https://www.onlinegdb.com/ - tutrialsPoint, sometimes reaction of web app is not as you expect. (Java 8) https://www.tutorialspoint.com/compile_java_online.php - ideOne (Java 8, 12) http://ideone.com/ ...

Name the function used to view the list of packages installed in the system. 

import java.util.Arrays; ... System.out.println( Arrays.toString(Package.getPackages()).replace(",",",\n"));