JAVAFX - How fill and work with PieChart (graph)

import javafx.scene.chart.PieChart;
...
@FXML PieChart pieChart1;
...
/* set text */
    
pieChart1.setTitle( "This is a chart" );        

/* add data */
    
ObservableList series = FXCollections.observableArrayList(); 
series.add( new PieChart.Data( "Q1", 5 ) );
series.add( new PieChart.Data( "Q2", 5.5 ) );
series.add( new PieChart.Data( "Q3", 8 ) );
series.add( new PieChart.Data( "Q4", 3 ) );
         
pieChart1.setData( series ); 

Output: