Each PersistentObject has a unique long key.

1. Import the required classes and interfaces.

   import net.rim.device.api.system.PersistentObject;
   import net.rim.device.api.system.PersistentStore;
   import java.lang.String;
   import net.rim.device.api.ui.component.Dialog;

2. To create a unique long key, in the BlackBerry® Integrated Development Environment, type a string value. For exmaple, com.rim.samples.docs.userinfo
3. Right-click the string and click Convert ‘com.rim.samples.docs.userinfo’ to long.
4. Include a comment in your code to indicate the string that you used to generate the unique long key.
5. To create a persistent data store, create a single static PersistentObject and invoke PersistentStore.getPersistentObject, using the unique long key as a parameter.

   static PersistentObject store;
   static {
   store = PersistentStore.getPersistentObject( 0xa1a569278238dad2L );
   }

1. Import the required classes and interfaces.

   import net.rim.device.api.system.PersistentObject;
   import net.rim.device.api.system.PersistentStore;

2. Invoke setContents() on a PersistentObject. This method replaces the existing content with the new content.
3. To save the new content to the persistent store, invoke commit().

   String[] userinfo = {username, password};
   synchronized(store) {
   store.setContents(userinfo); 
   store.commit();
   }

4. To use a batch transaction to commit objects to the persistent store, invoke PersistentStore.getSynchObject(). This method retrieves the persistent store monitor that locks the object.
   1. Synchronize on the object.
   2. Invoke commit() as necessary. If any commit in the batch fails, the entire batch transaction fails.
5. To commit a monitor object separately from a batch transaction, invoke forceCommit() while synchronizing the monitor object.

1. To use a batch transaction to commit objects to the persistent store, invoke PersistentStore.getSynchObject(). This method retrieves the persistent store monitor that locks the object.
2. Synchronize on the object.
3. Invoke commit() as necessary. If any commit in the batch fails, the entire batch transaction fails.