Examples of java.util.prefs.Preferences.sync()

java.util.prefs.Preferences.sync()
Ensures that future reads from this preference node and its descendants reflect any changes that were committed to the persistent store (from any VM) prior to the sync invocation. As a side-effect, forces any changes in the contents of this preference node and its descendants to the persistent store, as if the flush method had been invoked on this node. @throws BackingStoreException if this operation cannot be completeddue to a failure in the backing store, or inability to communicate with it. @throws IllegalStateException if this node (or an ancestor) has beenremoved with the {@link #removeNode()} method. @see #flush()

    try {
      initialDir = userPrefs.get("dir", null);
      if (initialDir == null) {
        initialDir = System.getProperty("user.home");
        userPrefs.put("dir", initialDir);
        userPrefs.sync();
      }
    } catch (BackingStoreException exc) {
      userPrefs = null;
      initialDir = System.getProperty("user.home");
    }

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      }
    }
    if (dir != null) {
      userPrefs.put("dir", dir.getAbsolutePath());
      try {
        userPrefs.sync();
      } catch (BackingStoreException exc) {
      }
    }


    boolean fileAdded = false;

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    public void testCreate() throws BackingStoreException
    {
        Preferences testNode = prefs.node( "testNode" );


        testNode.put( "testNodeKey", "testNodeValue" );
        testNode.sync();
    }




    /**
     * Tests the creation and use of a new preferences node.

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    public void testCreateAndSet() throws BackingStoreException
    {
        Preferences testNode = prefs.node( "testNode" );


        testNode.put( "testNodeKey", "testNodeValue" );
        testNode.sync();


        testNode.putBoolean( "boolKey", true );
        testNode.putByteArray( "arrayKey", new byte[10] );
        testNode.putDouble( "doubleKey", 3.14 );
        testNode.putFloat( "floatKey", ( float ) 3.14 );

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        testNode.putByteArray( "arrayKey", new byte[10] );
        testNode.putDouble( "doubleKey", 3.14 );
        testNode.putFloat( "floatKey", ( float ) 3.14 );
        testNode.putInt( "intKey", 345 );
        testNode.putLong( "longKey", 75449559185447L );
        testNode.sync();


        testNode = prefs.node( "testNode" );


        assertEquals( true, testNode.getBoolean( "boolKey", false ) );
        assertTrue( 3.14 == testNode.getDouble( "doubleKey", 9.20 ) );

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    public void testCreateAndRemove() throws BackingStoreException
    {
        Preferences testNode = prefs.node( "testNode" );


        testNode.put( "testNodeKey", "testNodeValue" );
        testNode.sync();


        testNode.putBoolean( "boolKey", true );
        testNode.putByteArray( "arrayKey", new byte[10] );
        testNode.putDouble( "doubleKey", 3.14 );
        testNode.putFloat( "floatKey", ( float ) 3.14 );

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        testNode.putByteArray( "arrayKey", new byte[10] );
        testNode.putDouble( "doubleKey", 3.14 );
        testNode.putFloat( "floatKey", ( float ) 3.14 );
        testNode.putInt( "intKey", 345 );
        testNode.putLong( "longKey", 75449559185447L );
        testNode.sync();


        testNode = prefs.node( "testNode" );


        assertEquals( true, testNode.getBoolean( "boolKey", false ) );
        assertTrue( 3.14 == testNode.getDouble( "doubleKey", 9.20 ) );

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        testNode.remove( "arrayKey" );


        assertEquals( "no value", testNode.get( "doubleKey", "no value" ) );
        assertEquals( "no value", testNode.get( "arrayKey", "no value" ) );


        testNode.sync();


        assertEquals( "no value", testNode.get( "doubleKey", "no value" ) );
        assertEquals( "no value", testNode.get( "arrayKey", "no value" ) );
    }
}

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    updatePreferences(preferences, "tripUpdatesUrl", model.getTripUpdatesUrl());
    updatePreferences(preferences, "vehiclePositionsUrl",
        model.getVehiclePositionsUrl());
    updatePreferences(preferences, "alertsUrl", model.getAlertsUrl());
    try {
      preferences.sync();
    } catch (BackingStoreException e) {
      e.printStackTrace();
    }
  }

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    }


    public static void clearMessages() throws BackingStoreException {
        Preferences prefs = Preferences.userNodeForPackage(BeforeAfterParent.class);
        prefs.clear();
        prefs.sync();
    }


    public static void addMessage(String message) {
        Preferences prefs = Preferences.userNodeForPackage(BeforeAfterParent.class);
        int numMessages = prefs.getInt("numMessages", 0);

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