Java Reference
In-Depth Information
The price field illustrates a way to construct a Double object. The fx:value attribute invokes the
valueOf(String) method on Double . This works on any Java class that has a factory method valueOf(String) :
<price>
<Double fx:value="3.1415926"/>
</price>
The discount field illustrates how to use a constant defined in a Java class. The fx:constant attribute accesses
constant (public static final) fields of the type of its element. The following sets the discount field to Utilities.TEN_PCT ,
which is 0.1 :
<discount>
<Utilities fx:constant="TEN_PCT"/>
</discount>
The sizes field illustrates the use of factory methods to create objects. The fx:factory attribute invokes the
specified factory method on the type of its element. In our case, it calls Utilities.createList() to create a list of
Integer s, which is then populated with three Integer s. Notice that sizes is a read-write property. You will see an
example of how a read-only list property is populated later.
<sizes>
<Utilities fx:factory="createList">
<Integer fx:value="1"/>
<Integer fx:value="2"/>
<Integer fx:value="3"/>
</Utilities>
</sizes>
The profits field illustrates how to populate a read-write map. Here we set the profits field to a HashMap that we
create with key/value pairs:
<profits>
<HashMap q1="1000" q2="1100" q3="1200" a4="1300"/>
</profits>
The inventory field illustrates how to define an object in one place and reference it in another place. The
fx:define element creates a stand-alone object that has an fx:id attribute. The fx:reference element creates a
reference to an object defined elsewhere, and its source attribute points to the fx:id of a previously defined object:
<fx:define>
<Long fx:id="inv" fx:value="9765625"/>
</fx:define>
<inventory>
<fx:reference source="inv"/>
</inventory>
The products field illustrates how to populate a read-only list. The following fragment of FXML is equivalent to
invoking bean.getProducts().addAll("widget", "gadget", "models") :
<products>
<String fx:value="widget"/>
<String fx:value="gadget"/>
<String fx:value="models"/>
</products>
 
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