JavaFX fill a table view not possible [duplicate]

问题

I just started with javafx and I wanted to create a TableView with 3 columns where I can display some values. I created the TableView and the columns with the scene editor as fxml file. Then I created a class named Values with the special properties I matched to the columns where they should fit in. Finally I set the observable list with the "Value" objects in it as items of the table. When I start the application, it only shows me an empty table. I looked like 4 hours in the internet now and still not found an answer why this is not working for me.

Here my code:

Value Class:

public class Values {
    public  SimpleDoubleProperty PSI = new SimpleDoubleProperty(0);
    public  SimpleDoubleProperty ALPHA = new SimpleDoubleProperty(0);
    public  SimpleDoubleProperty DELTA = new SimpleDoubleProperty(0);

    public Values(Double _PSI, Double _ALPHA, Double _DELTA) {
        setPSI(_PSI);
        setALPHA(_ALPHA);
        setDELTA(_DELTA);
    }

    private void setPSI(Double p){
        PSI.set(p);
    }
    private void setALPHA(Double p){
        ALPHA.set(p);
    }
    private void setDELTA(Double p){
        DELTA.set(p);
    }

}

Controller:

@FXML Label psi;
@FXML Label alpha;
@FXML Label delta;


@FXML TextField betafield;
@FXML TextField lambdafield;
@FXML TextField lambdasatfield;

@FXML TableView<Values> table;
@FXML ObservableList<Values> oblist;
@FXML TableColumn <Values,Double> psicolumn;
@FXML TableColumn <Values,Double> alphacolumn;
@FXML TableColumn <Values,Double> deltacolumn;

@Override
public void initialize(URL location, ResourceBundle resources) {
    psicolumn.setCellValueFactory(new PropertyValueFactory<Values, Double>("PSI"));
    alphacolumn.setCellValueFactory(new PropertyValueFactory<Values, Double>("ALPHA"));
    deltacolumn.setCellValueFactory(new PropertyValueFactory<Values, Double>("DELTA"));
}

@FXML
protected void buttonpressed(){
    try {
        Calculation cal = new Calculation(Double.parseDouble(betafield.getText()), Double.parseDouble(lambdafield.getText()), Double.parseDouble(lambdasatfield.getText()));
        alpha.setText("Alpha: " + " " + cal.calculateAlpha());
        delta.setText("Delta:"+ " " + cal.calculateDelta());
        psi.setText("Psi:"+ " " + cal.calculatePSI());
        table.setItems(FXCollections.observableArrayList(cal.calculateEvaluaiontable()));
    }catch (NullPointerException e){
        e.printStackTrace();
    }
}

And my FXML:

 <Tab text="tab" fx:id="tabe">
   <content>
     <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
         <children>
            <TableView layoutX="4.0" layoutY="4.0" prefHeight="192.0" prefWidth="370.0" fx:id="table">
                <columns>
                    <TableColumn prefWidth="120.0" text="PSI" fx:id="psicolumn" />
                    <TableColumn prefWidth="120.0" text="ALPHA" fx:id="alphacolumn" />
                    <TableColumn prefWidth="120.0" text="DELTA" fx:id="deltacolumn" />
                </columns>
            </TableView>
         </children>
      </AnchorPane>
   </content>
 </Tab>

Thanks for your help!

回答1:

Let <name> denote the constructor parameter of PropertyValueFactory and let <Name> denote the same String, but with an uppercase first letter.

PropertyValueFactory can get the value from one of the following sources:

The property getter, i.e. the a method SomeObservableValue <name>Property().
The getter method, i.e. the method SomeType get<Name>().

None of those exist in your Values class.

For the psicolumn to work, Values needs a DoubleProperty PSIProperty() method or a double getPSI() method. (Same issue with the other columns)

来源：https://stackoverflow.com/questions/37810176/javafx-fill-a-table-view-not-possible

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