JavaFX DatePicker

我就是我 2023-10-15 09:33 115阅读 0赞

A JavaFX DatePicker control enables the user to enter a date or choose a date from a wizard-like popup dialog. The popup dialog shows only valid dates, so this is an easier way for users to choose a date and ensure that both the date and date format entered in the date picker text field is valid. The JavaFX DatePicker is represented by the class `javafx.scene.control.DatePicker` .

The `DatePicker` is a subclass of the `ComboBox` class, and thus shares some similarities with this class.

### Creating a DatePicker ###

You create a DatePicker control via the constructor of the `DatePicker` class. Here is a JavaFX `DatePicker` instantiation example:

DatePicker datePicker = new DatePicker();

### Adding a DatePicker to the Scene Graph ###

To make a `DatePicker` visible it must be added to the JavaFX scene graph. This means adding it to a `Scene` object, or to a layout component which is added to a `Scene` object.

Here is an example showing how to add a JavaFX `DatePicker` to the scene graph:

package com.jenkov.javafx.controls;
    
    import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.control.DatePicker;
    import javafx.scene.layout.HBox;
    import javafx.stage.Stage;
    
    public class DatePickerExperiments extends Application  {
    
        @Override
        public void start(Stage primaryStage) throws Exception {
            primaryStage.setTitle("Button Experiment 1");
    
            DatePicker datePicker = new DatePicker();
    
            HBox hbox = new HBox(datePicker);
    
            Scene scene = new Scene(hbox, 200, 100);
            primaryStage.setScene(scene);
            primaryStage.show();
    
        }
    
        public static void main(String[] args) {
            Application.launch(args);
        }
    }

The application resulting from running this example would look similar to this:

![0bfbae4f6f024c3aa3f15162ef68e2bc.png][]

### Reading the Selected Date ###

Reading the date selected in the `DatePicker` can be done using its `getValue()` method. Here is an example of reading the selected date from a `DatePicker`:

LocalDate value = datePicker.getValue();

The `getValue()` returns a [LocalDate][] object representing the date selected in the `DatePicker`.

Here is a full example with a button added to extract the selected date in the `DatePicker` when the button is clicked:

package com.jenkov.javafx.controls;
    
    import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.control.Button;
    import javafx.scene.control.DatePicker;
    import javafx.scene.layout.HBox;
    import javafx.stage.Stage;
    
    import java.time.LocalDate;
    
    public class DatePickerExperiments extends Application  {
    
        @Override
        public void start(Stage primaryStage) throws Exception {
            primaryStage.setTitle("DatePicker Experiment 1");
    
            DatePicker datePicker = new DatePicker();
    
            Button button = new Button("Read Date");
    
            button.setOnAction(action -> {
                LocalDate value = datePicker.getValue();
            });
    
            HBox hbox = new HBox(datePicker);
    
            Scene scene = new Scene(hbox, 300, 240);
            primaryStage.setScene(scene);
            primaryStage.show();
        }
    
        public static void main(String[] args) {
            Application.launch(args);
        }
    }

[0bfbae4f6f024c3aa3f15162ef68e2bc.png]: https://img-blog.csdnimg.cn/0bfbae4f6f024c3aa3f15162ef68e2bc.png
[LocalDate]: https://jenkov.com/java-date-time/localdate.html