Slide 4.8: Preferences.java   Slide 4.10: Line-by-line anatomy of RecordStore project (cont.)   Home

Line-by-line Anatomy of RecordStore Project

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import javax.microedition.rms.*;
The package javax.microedition.rms is a mechanism for MIDlets to persistently store data and later retrieve it.

Class hierarchy

• class java.lang.Object
  • class javax.microedition.rms.RecordStore
  • class java.lang.Throwable
    • class java.lang.Exception
      • class javax.microedition.rms.RecordStoreException
        • class javax.microedition.rms.InvalidRecordIDException
        • class javax.microedition.rms.RecordStoreFullException
        • class javax.microedition.rms.RecordStoreNotFoundException
        • class javax.microedition.rms.RecordStoreNotOpenException

Interface hierarchy

• interface javax.microedition.rms.RecordComparator
• interface javax.microedition.rms.RecordEnumeration
• interface javax.microedition.rms.RecordFilter
• interface javax.microedition.rms.RecordListener

mForm.append( new StringItem( null, rse.toString( ) ) );
The constructor public StringItem(String label, String text) creates a new javax.microedition.lcdui.StringItem object with the given label and textual content. Either label or text may be present or null.

• label—the Item label
• text—the text contents

private Hashtable mHashtable;
The class java.util.Hashtable implements a hashtable, which maps keys to values. Any non-null object can be used as a key or as a value. To successfully store and retrieve objects from a hashtable, the objects used as keys must implement the hashCode method and the equals method.