Java for Data Science

Creating index charts

An index chart is a line chart that shows the percentage change of something over time. Frequently, such a chart is based on a single data attribute. In the following example, we will be using the Belgian population for six decades. The data is a subset of population data found at https://ourworldindata.org/grapher/population-by-country?tab=data:

Decade	Population
1950	8639369
1960	9118700
1970	9637800
1980	9846800
1990	9969310
2000	10263618

We start by creating the MainApp class, which extends Application. We create a series of instance variables. The XYChart.Series class represents a series of data points for some plot. In our case, this will be for the decades and population, which we will initialize shortly. ...