Write a program in efficient way as you write for kernel scheduler

why bother with null and java 8 has optional

linux is my kernel programming is my bus

Just as it is a good practice to make all fields private unless they need greater visibility, it is a good practice to make all fields final unless they need to be mutable.

Software development is the process of creating a computer software.
It includes preparing a design, coding the program, and fixing the
bugs. The final goal of software development is to translate user
needs to software product, while continuously improving the team
and the process.

The computer programmer is a creator of universes for which he alone is the lawgiver. No playwright, no stage director, no emperor, however powerful, has ever exercised such absolute authority to arrange a stage or field of battle and to command such unswervingly dutiful actors or troops.