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JavaFX PasswordField

Jakob Jenkov
Last update: 2016-05-19

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:

A JavaFX PasswordField component displayed in the scene graph.

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);
    }
}

Jakob Jenkov




Copyright  Jenkov Aps
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