There is no global variables support in Java. Static variables can be used as an alternate solution for global variables.

Java Regex Capturing Groups

Default access modifier means we do not explicitly declare an access modifier for a class, field, method, etc. The scope of the default access modifier lies within the package. When a class or its members associated with default access modifier then. Example Variables and methods can be declared without any ... Read More

BAPI is an abbreviation for Business Application Programming Interface.BAPI’s are proprietary interfaces of SAP. These provide standard access to SAP solution with all the semantic checks already present. Using BAPI interfaces, we can perform both synchronous and asynchronous processing of data.

Yes, a local variable can be public, private, protected or default.

In Java, immutable objects are those whose data can’t be changed or modified (once modified). String class is immutable i.e. once we create a String object its data cannot be modified.

As far as I know, there is no direct way of inserting an Array using SQL query. You will first have to combine the columns (EMPL_Id + Skill Id) using the code and then do a bulk insert to the database.