Using binding operations

Directly connecting properties is not always enough. The Binding API can build complex dependencies between properties.

String operations

Concatenation is the most common string operation. It's called by one property of the String type and takes another property of any type or a constant that will be used as a String, as shown in the following code snippet: 

// chapter3/operations/ConcatBinding.java 
label.textProperty().bind(
    stage.widthProperty().asString() // property one
    .concat(" : ")                   // concatting with a string constant
    .concat(stage.heightProperty())  // concatting with a property 2
);

Note

You don't need to call asString() for a concat() parameter, as it's done by JavaFX.

Note two very important concepts here:

• Binding operations allow us to chain them one after another (as in the Builder pattern, or in the Java8 Streams API)
• We've bound one property to the two others here

And, we are not limited by two properties: you can build a binding...