PasswordField用于密码输入。用户键入的字符通过显示回显字符串被隐藏。

创建密码字段

以下代码使用来自PasswordField类的默认构造函数创建一个密码字段，然后为密码字段设置提示消息文本。提示消息在字段中显示为灰色文本，并为用户提供该字段是什么的提示，而不使用标签控件。

PasswordField passwordField = new PasswordField();passwordField.setPromptText("Your password");

PasswordField类有setText方法来为控件设置文本字符串。对于密码字段，指定的字符串由echo字符隐藏。默认情况下，echo字符是一个点。

密码字段中的值可以通过getText方法获取。

例子

密码字段和操作侦听器

/* * Copyright (c) 2011, 2012 Oracle and/or its affiliates. * All rights reserved. Use is subject to license terms. * * This file is available and licensed under the following license: * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the distribution. * - Neither the name of Oracle nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */import javafx.application.Application;import javafx.event.ActionEvent;import javafx.event.EventHandler;import javafx.geometry.Insets;import javafx.geometry.Pos;import javafx.scene.Group;import javafx.scene.Scene;import javafx.scene.control.Label;import javafx.scene.control.PasswordField;import javafx.scene.layout.HBox;import javafx.scene.layout.VBox;import javafx.scene.paint.Color;import javafx.stage.Stage;public class Main extends Application { final Label message = new Label(""); @Override public void start(Stage stage) { Group root = new Group(); Scene scene = new Scene(root, 260, 80); stage.setScene(scene); stage.setTitle("Password Field Sample"); VBox vb = new VBox(); vb.setPadding(new Insets(10, 0, 0, 10)); vb.setSpacing(10); HBox hb = new HBox(); hb.setSpacing(10); hb.setAlignment(Pos.CENTER_LEFT); Label label = new Label("Password"); final PasswordField pb = new PasswordField(); pb.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent e) { if (!pb.getText().equals("abc")) { message.setText("Your password is incorrect!"); message.setTextFill(Color.web("red")); } else { message.setText("Your password has been confirmed"); message.setTextFill(Color.web("black")); } pb.setText(""); } }); hb.getChildren().addAll(label, pb); vb.getChildren().addAll(hb, message); scene.setRoot(vb); stage.show(); } public static void main(String[] args) { launch(args); }}

上面的代码生成以下结果。