JavaFX XYChart 警告

Question

讓我們舉個小例子，這些警告是什么/我在這里做錯了什么？

Raw use of parameterized class 'XYChart.Data'
Unchecked assignment: 'javafx.scene.chart.XYChart.Data' to 'javafx.scene.chart.XYChart.Data<java.lang.String,java.lang.Number>'
Unchecked call to 'Data(X, Y)' as a member of raw type 'javafx.scene.chart.XYChart.Data'

這將是代碼

private final XYChart.Series<String, Number> courseSeries = new XYChart.Series<>();
private final LinkedList<XYChart.Series<String, Number>> courseSeriesTimespan = new LinkedList<>();
@FXML
public BarChart<String, Number> course;

private void test(){
    courseSeriesTimespan.get(1).getData().add(new XYChart.Data("Jän", 1));
}

Answer 1

使用參數化類型

courseSeriesTimespan.get(1).getData().add(new XYChart.Data<String,Number>("Jän", 1));

更新。 或者不指定具體類型

courseSeriesTimespan.get(1).getData().add(new XYChart.Data<>("Jän", 1));