Chapter 5. Data Persistency

IN THIS CHAPTER

• RMS Basics

• Basic Functionality of the Class RecordStore

• A Simple Diary Application Using RMS

• Record Listeners

• Storing Custom Objects

• Ordered Traversal: Comparators and Record Enumerations

• The Search Problem

Mobile devices such as cellular phones or PDAs normally don't have a file system available like that found on desktop computers. However, these devices still provide a mechanism to store data persistently. This mechanism is based on memory techniques such as flash memory. These techniques provide an advantage in that the head-positioning times associated with disk-based media are avoided. Thus, a more appropriate system based on random record access instead of sequential file reading is provided for these devices. For access to this record system, PDAP and MIDP contain the Record Management System (RMS).