JavaFX - RadioButton单选按钮

1. RadioButton是javafx的单选按钮，同其他的编程一样，需要将单选条件的所有按钮放到同一个group内(ToggleGroup )，否则没有单选效果。

2.两种默认选中按钮的方式

3.两种监听方式，一种对单独的按钮进行监听，一种对按钮group进行监听。

package sample;


import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.geometry.Side;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
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 {


        AnchorPane ap = new AnchorPane();
        ap.setStyle("-fx-background-color: #6d5c39");

        ToggleGroup toggleGroup = new ToggleGroup();//单选组
        RadioButton r1 = new RadioButton("Radiobutton1");//单选按钮,得放到一个组，不然效果会变成多选
        RadioButton r2 = new RadioButton("Radiobutton2");
        RadioButton r3 = new RadioButton("Radiobutton3");
        RadioButton r4 = new RadioButton("Radiobutton4");
        r1.setToggleGroup(toggleGroup);//将1234放入同一个组
        r2.setToggleGroup(toggleGroup);
        r3.setToggleGroup(toggleGroup);
        r4.setToggleGroup(toggleGroup);

        //两种默认选择的方式
//        r1.setSelected(true);//默认选择1
        toggleGroup.selectToggle(r3);//默认选择3

        HBox hbox = new HBox(10);
        hbox.setStyle("-fx-background-color: #dce30b");
        hbox.getChildren().addAll(r1, r2, r3, r4);
        ap.getChildren().addAll(hbox);
        AnchorPane.setTopAnchor(hbox, 200.0);
        AnchorPane.setLeftAnchor(hbox, 200.0);
        Scene scene = new Scene(ap);


        primaryStage.setScene(scene);
        primaryStage.setTitle("Java FX  ");
        primaryStage.setWidth(800);
        primaryStage.setHeight(800);
        primaryStage.show();

        r1.selectedProperty().addListener(new ChangeListener<Boolean>() {   //r1监听单独
            @Override
            public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
                System.out.println("r1是否被选择：："+newValue);
            }
        });
        toggleGroup.selectedToggleProperty().addListener(new ChangeListener<Toggle>() {
            @Override
            public void changed(ObservableValue<? extends Toggle> observable, Toggle oldValue, Toggle newValue) {
               RadioButton r = (RadioButton)newValue;
                System.out.println("谁被选择::    "+r.getText());
            }
        });
    }


}