JavaFX BarChart

In general, A bar chart can be defined as a diagram which uses rectangular bars for the data representation. The length of the bars represents the exact numeric data values plotted on one of the axes. The rectangular bars can be plotted horizontally or vertically on the graph.

In the following image, A bar chart shows the number of students in each branch of engineering. The X-axis is the category axis which shows different branches while the Y-axis is the number axis which shows the number of students in a particular branch.

In JavaFX, the class javafx.scene.chart.BarChart represents the Bar Chart. We need to instantiate this class in order to create the bar chart.

Properties

The properties of the class along with the setter methods are described in the following table.

Property	Description	Setter Method
barGap	This is a double type property. It represents the gap between the bars of the same category.	setBarGap(Double value)
categoryGap	This is a double type property. It represents the gap between the different category.	setCategoryGap(Double value)

Constructors

There are the three constructors in the class.

public BarChart(AxisXaxis, AxisYaxis) :creates the new instance of BarChart with the specified axis.
public BarChart(AxisXaxis, AxisYaxis, ObservableList> data):creates the new instance of BarChart with the specified axis and data.
public BarChart(AxisXaxis, AxisYaxis, ObservableList> data, double categoryGap)) :Creates the new instance of BarChart with the specifies axis, data and the category gap.

Example

In the following example, we have shown the conversion between the different currencies and the Dollar.

package application;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.chart.BarChart;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;
public class BarChartExample extends Application {
@Override
public void start(Stage primaryStage) throws Exception {
	// TODO Auto-generated method stub
	//Defining string to label XAxis 
	String Euro = "Euro";
	String Pound = "British Pound";
	String A_Dollar = "Austrelian Dollar";
	String frenc= "Swis Franc";
	
	//Configuring category and NumberAxis 
	CategoryAxis xaxis= new CategoryAxis();
	NumberAxis yaxis = new NumberAxis(0.1,2,0.1);
	xaxis.setLabel("Currency");
	yaxis.setLabel("Dollar price");
	
	//Configuring BarChart 
	BarChart<String,Float> bar = new BarChart(xaxis,yaxis);
	bar.setTitle("Dollar Conversion chart");
	
	//Configuring Series for XY chart 
	XYChart.Series<String,Float> series = new XYChart.Series<>();
	series.getData().add(new XYChart.Data(Euro,0.83));
	series.getData().add(new XYChart.Data(Pound,0.73));
    series.getData().add(new XYChart.Data(frenc,1.00));
	series.getData().add(new XYChart.Data(A_Dollar,1.32));
	
	//Adding series to the barchart 
	bar.getData().add(series);
	
	// configuring group and scene 
	Group root = new Group();
	root.getChildren().add(bar);
	Scene scene = new Scene(root,600,400);
	primaryStage.setScene(scene);
	primaryStage.setTitle("BarChart Example");
	primaryStage.show();	
}
public static void main(String[] args) {
	launch(args);
}
}