JavaFX PasswordField
Jakob Jenkov |
A JavaFX PasswordField control enables users of a JavaFX application to enter password which can then be read by the
application. The PasswordField
control does not show the texted entered into it. Instead it shows
a circle for each character entered. The JavaFX PasswordField control is represented by the class
javafx.scene.control.PasswordField
.
Creating a PasswordField
You create a PasswordField control by creating an instance of the PasswordField
class.
Here is a JavaFX PasswordField
instantiation example:
PasswordField passwordField = new PasswordField();
Adding a PasswordField to the Scene Graph
For a JavaFX PasswordField
to be visible the PasswordField
object must be added to the scene graph.
This means adding it to a Scene
object, or as child of a layout which is attached to a Scene
object.
Here is an example that attaches a JavaFX PasswordField
to the scene graph:
package com.jenkov.javafx.controls; import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.PasswordField; import javafx.scene.layout.HBox; import javafx.stage.Stage; public class PasswordFieldExperiments extends Application { @Override public void start(Stage primaryStage) throws Exception { primaryStage.setTitle("PasswordField Experiment 1"); PasswordField passwordField = new PasswordField(); HBox hbox = new HBox(passwordField); Scene scene = new Scene(hbox, 200, 100); primaryStage.setScene(scene); primaryStage.show(); } public static void main(String[] args) { Application.launch(args); } }
The result of running the above JavaFX PasswordField
example is an application that looks like this:
Getting the Text of a PasswordField
You can get the text entered into a PasswordField
using its getText()
method which returns
a String
. Here is a full example that shows a PasswordField
and a Button
and which reads the text entered into the PasswordField
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.PasswordField; import javafx.scene.layout.HBox; import javafx.stage.Stage; public class PasswordFieldExperiments extends Application { @Override public void start(Stage primaryStage) throws Exception { primaryStage.setTitle("PasswordField Experiment 1"); PasswordField passwordField = new PasswordField(); Button button = new Button("Click to get password"); button.setOnAction(action -> { System.out.println(passwordField.getText()); }); HBox hbox = new HBox(passwordField, button); Scene scene = new Scene(hbox, 200, 100); primaryStage.setScene(scene); primaryStage.show(); } public static void main(String[] args) { Application.launch(args); } }
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Jakob Jenkov |