CategoryAxis.toRealValue(double value) has the following syntax.
public java.lang.String toRealValue(double value)
In the following code shows how to use CategoryAxis.toRealValue(double value) method.
import javafx.application.Application; import javafx.collections.FXCollections; import javafx.collections.ObservableList; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.chart.CategoryAxis; import javafx.scene.layout.VBox; import javafx.stage.Stage; /*w w w. ja va 2 s. co m*/ public class Main extends Application { @Override public void start(final Stage stage) { stage.setWidth(500); stage.setHeight(500); Scene scene = new Scene(new Group()); VBox root = new VBox(); CategoryAxis lineXAxis = new CategoryAxis(getData()); System.out.println(lineXAxis.toRealValue(1.2)); root.getChildren().addAll(lineXAxis); scene.setRoot(root); stage.setScene(scene); stage.show(); } private ObservableList<String> getData() { ObservableList<String> answer = FXCollections.observableArrayList(); answer.addAll("Sales","Products"); return answer; } public static void main(String[] args) { launch(args); } }