warning: [unchecked] unchecked call to Data(X,Y) as a member of the raw type Data

HarrySatt

I trying out tutorial stuff. Now I am with https://docs.oracle.com/javafx/2/charts/bar-chart.htm the BarChart tutorial. I created a new project with name BarChartSample ( the name of the tutorial class ) and pasted the code from the tutorial into the created source file. It compiles and does what it should. But I see some notes:

Note: C:\Users\hsattm72\Documents\NetBeansProjects\JavaFXBarChart\src\barchartsample\BarChartSample.java uses unchecked or unsafe operations.

Note: Recompile with -Xlint:unchecked for details.

So I used the -Xlint:unchecked compiler option for seeing what is meaning of this. In Netbeans I found this under Project Properties -> Build -> Compiling at the bottom "Additional compiler options"

After a clean + build I saw a lot of warnings like:

C:\Users\hsattm72\Documents\NetBeansProjects\JavaFXBarChart\src\barchartsample\BarChartSample.java:35:

warning: [unchecked] unchecked call to Data(X,Y) as a member of the raw type Data series1.getData().add(new XYChart.Data(austria, 25601.34));

  where X,Y are type-variables:

    X extends Object declared in class Data

    Y extends Object declared in class Data

In factthe number of warnings is around 30. That is a lot.

What is not perfect in the sample code? How can I avoid these warnings?

Thanks a lot in advance, Harald.