1. Home
  2. Programming
  3. Java performance tuning

Chapter 7. Loops, Switches, and Recursion

I have made this letter longer than usual because I lack the time to make it shorter.

Blaise Pascal

This chapter describes performance-tuning a variety of common code structures: loops, switches, and recursion. Some of the tuning hints here are straightforward (for example, remove code from a loop if it is executed only once), but many are more esoteric, particularly given the subtleties of optimizations performed by HotSpot VMs and JIT compilers. Read on for details.



    		Chapter 1. Introduction
    		Chapter 2. Profiling Tools
    		Chapter 3. Underlying JDK Improvements
    		Chapter 4. Object Creation
    		Chapter 5. Strings
    		Chapter 6. Exceptions, Assertions, Casts, and Variables
    		Chapter 7. Loops, Switches, and Recursion
    		7.1 Loops
    		7.2 Tuning a Loop
    		7.3 Exception-Terminated Loops
    		7.4 Switches
    		7.5 Recursion
    		7.6 Recursion and Stacks
    		7.7 Performance Checklist
    		Chapter 8. I/O, Logging, and Console Output
    		Chapter 9. Sorting
    		Chapter 10. Threading
    		Chapter 11. Appropriate Data Structures and Algorithms
    		Chapter 12. Distributed Computing
    		Chapter 13. When to Optimize
    		Chapter 14. Underlying Operating System and Network Improvements
    		Chapter 15. J2EE Performance Tuning
    		Chapter 16. Tuning JDBC
    		Chapter 17. Tuning Servlets and JSPs
    		Chapter 18. Tuning EJBs
    		Chapter 19. Further Resources