FlowPane.setPrefWrapLength(double value) has the following syntax.
public final void setPrefWrapLength(double value)
In the following code shows how to use FlowPane.setPrefWrapLength(double value) method.
/* w w w. ja va2s.com*/ import javafx.application.Application; import javafx.geometry.Orientation; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.layout.FlowPane; import javafx.stage.Stage; public class Main extends Application { @Override public void start(Stage stage) { stage.setTitle("HTML"); stage.setWidth(500); stage.setHeight(500); Scene scene = new Scene(new Group()); FlowPane flow = new FlowPane(Orientation.VERTICAL); flow.setVgap(8); flow.setHgap(4); flow.setPrefWrapLength(300); // preferred width = 300 for (int i = 0; i < 10; i++) { flow.getChildren().add(new Button("asdf")); } scene.setRoot(flow); stage.setScene(scene); stage.show(); } public static void main(String[] args) { launch(args); } }