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1、基本概念

窗口          Stage  -场景       Scene    -布局     stackPane      -控件   Button

2、最小框架代码

创建命令行应用

package com.company;import javafx.application.Application;import javafx.stage.Stage;public class HelloWorld extends Application {
       @Override    public void start(Stage primaryStage) throws Exception {
           primaryStage.show();    }    public static void main(String[] args) {
           launch(args);    }}

对就是啥都没有，空白的窗体

3、控件布局

package com.company;import javafx.application.Application;import javafx.scene.Scene;import javafx.scene.control.Button;import javafx.scene.layout.StackPane;import javafx.stage.Stage;public class Main extends Application {
       public static void main(String[] args) {
           launch(args);    }    @Override    public void start(Stage primaryStage) throws Exception {
           // 实例化按钮        Button button = new Button("这是按钮上的文字");        // 创建布局控件        StackPane stackPane = new StackPane();        // 将button添加到布局        stackPane.getChildren().add(button);        // 创建场景 宽=400 高=400        Scene scene = new Scene(stackPane, 400, 400);        // 将场景添加到窗口        primaryStage.setScene(scene);        // 显示窗口        primaryStage.show();    }}

4、事件添加

Main.java

package com.company;import javafx.application.Application;import javafx.event.EventHandler;import javafx.scene.Scene;import javafx.scene.control.Button;import javafx.scene.input.MouseEvent;import javafx.scene.layout.StackPane;import javafx.stage.Stage;public class Main extends Application implements EventHandler
   
     {
       private Button button;    public static void main(String[] args) {
           // write your code here//        System.out.println("你好");        launch(args);    }    @Override    public void start(Stage primaryStage) throws Exception {
           // 实例化按钮        button = new Button("这是按钮");        // 1、添加按钮点击事件， this.handle 处理事件//        button.setOnMouseClicked(this);//        2、使用单独实现的类 事件监听//        button.setOnMouseClicked(new MyMouseEvent());//        3、使用匿名类添加事件监听        button.setOnMouseClicked(new EventHandler
    
     () {
               @Override            public void handle(MouseEvent event) {
                   System.out.println("鼠标点击按钮了");            }        });//        4、jdk 8  使用简写执行一条输出        button.setOnMouseClicked(e -> System.out.println("简写的监听事件"));//        5、同时输出多条        button.setOnMouseClicked(e -> {
               System.out.println("简写的监听事件1");            System.out.println("简写的监听事件2");        });        // 创建布局控件        StackPane stackPane = new StackPane();        // 将button添加到布局        stackPane.getChildren().add(button);        // 创建场景        Scene scene = new Scene(stackPane, 400, 400);        // 给场景添加事件处理的对象//        scene.setOnMousePressed(this);        scene.setOnMousePressed(new MySceneMouseEvent());        // 将场景添加到窗口        primaryStage.setScene(scene);        // 显示窗口        primaryStage.show();    }    @Override    public void handle(MouseEvent event) {
           // event.getSource() 获取事件对象        if (event.getSource() == button) {
               System.out.println("点击了按钮");        } else {
               System.out.println("点击了场景");        }    }}
    
   

MyMouseEvent.java 处理鼠标点击事件的类

package com.company;import javafx.event.EventHandler;import javafx.scene.input.MouseEvent;public class MyMouseEvent implements EventHandler
   
     {
       @Override    public void handle(MouseEvent event) {
           System.out.println("MyMouseEvent click");    }}
   

MySceneMouseEvent.java 处理场景点击事件的类

package com.company;import javafx.event.EventHandler;import javafx.scene.input.MouseEvent;public class MySceneMouseEvent implements EventHandler
   
     {
       @Override    public void handle(MouseEvent event) {
           System.out.println("场景鼠标点击");    }}
   

5、场景切换

package com.company;import javafx.application.Application;import javafx.scene.Scene;import javafx.scene.control.Button;import javafx.scene.layout.StackPane;import javafx.scene.layout.VBox;import javafx.stage.Stage;public class SceneChange extends Application {
       Scene scene1,  scene2;    public static void main(String[] args) {
           launch(args);    }    @Override    public void start(Stage primaryStage) throws Exception {
           // 场景1        Button button1 = new Button("场景1 的button");        // 事件监听 点击后切换到场景2        button1.setOnMouseClicked(e -> {
               primaryStage.setScene(scene2);        });        VBox vBox = new VBox();        vBox.getChildren().add(button1);        scene1 = new Scene(vBox, 400, 400);        // 场景2        Button button2 = new Button("场景2 的button");        // 事件监听 点击后切换到场景1        button2.setOnMouseClicked(e -> {
               primaryStage.setScene(scene1);        });        StackPane stackPane = new StackPane();        stackPane.getChildren().add(button2);        scene2 = new Scene(stackPane, 400, 400);        primaryStage.setScene(scene1);        primaryStage.show();    }}

6、窗体切换

Main.java

package com.company;import javafx.application.Application;import javafx.scene.Scene;import javafx.scene.control.Button;import javafx.scene.layout.VBox;import javafx.stage.Stage;public class Main extends Application {
       private Stage stage;    @Override    public void start(Stage primaryStage) throws Exception {
           stage = primaryStage;        // 窗口点击叉号关闭询问        stage.setOnCloseRequest(event -> {
               event.consume();  // 消除默认事件            handleClose();        });        // 布局        Button button = new Button("关闭窗口");        // 鼠标点击关闭窗口        button.setOnMouseClicked(event -> handleClose());        VBox vBox = new VBox();        vBox.getChildren().add(button);        Scene scene = new Scene(vBox, 400, 400);        stage.setScene(scene);        stage.show();    }    public void handleClose() {
           // 接收窗体返回值        boolean ret = WindowAlert.display("关闭窗口", "是否关闭窗口？");        System.out.println(ret);        if (ret) {
               stage.close();        }    }    public static void main(String[] args) {
           launch(args);    }}

WindowAlert.java

package com.company;import javafx.geometry.Pos;import javafx.scene.Scene;import javafx.scene.control.Button;import javafx.scene.control.Label;import javafx.scene.layout.VBox;import javafx.stage.Modality;import javafx.stage.Stage;public class WindowAlert {
       public static boolean answer;    /**     * @param title 标题     * @param msg   消息     */    public static boolean display(String title, String msg) {
           // 创建舞台        Stage stage = new Stage();        // 设置显示模式        stage.initModality(Modality.APPLICATION_MODAL);        stage.setTitle(title);        // 创建控件        Button buttonYes = new Button("是");        buttonYes.setOnMouseClicked(event -> {
               answer = true;            stage.close();        });        Button buttonNo = new Button("否");        buttonNo.setOnMouseClicked(event -> {
               answer = false;            stage.close();        });        Label label = new Label(msg);        // 创建布局        VBox vBox = new VBox();        vBox.getChildren().addAll(label, buttonYes, buttonNo);        vBox.setAlignment(Pos.CENTER); // 布局居中显示        // 创建场景        Scene scene = new Scene(vBox, 200, 200);        // 显示舞台        stage.setScene(scene);//        stage.show();        stage.showAndWait();  // 等待窗体关闭才继续        // 窗体返回值        return answer;    }}

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