如何在程序等待按下按钮时执行某些操作？

Question

我想一直更改CIRECLE颜色，计数器小于3，而我等待单击按钮。当圆环变红时，他需要按“停止”。这是程序：public class Q1_2 extends Application {    private MyCircle circle = MyCircle.getInstance();    public int COUNTER;    public Color CURRENT_COLOR;    public Color currentColor;    public static void main(String[] args) {        launch();    }    @Override    public void start(Stage primaryStage) throws Exception {        circle.setRadius(100);        RadioButton bColor = new RadioButton("Stop");        COUNTER = 0;        HBox box = new HBox(40, bColor);        box.setPadding(new Insets(30));        StackPane pane = new StackPane(circle, box);        Scene scene = new Scene(pane, 500, 500);        primaryStage.setScene(scene);        primaryStage.show();        bColor.setOnAction(e -> {            if (bColor.isSelected() == true && currentColor != javafx.scene.paint.Color.RED) {                COUNTER++;                bColor.setSelected(false);            }            if (bColor.isSelected() == true && currentColor == javafx.scene.paint.Color.RED)                System.out.println("GREAT");        });        while (COUNTER < 3) {            currentColor = chooseColor();            circle.setFill(currentColor);            if (COUNTER == 3)                System.out.println("YOU LOSE");        }    }}谢谢！

Answer 1

如果我对你的理解是正确的，你可以使用时间轴来改变圆圈的颜色，并在按下按钮时停止。Timeline

示例代码：

import java.util.Arrays;

import java.util.List;

import java.util.concurrent.atomic.AtomicInteger;

import javafx.animation.KeyFrame;

import javafx.animation.Timeline;

import javafx.application.Application;

import javafx.event.ActionEvent;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.layout.StackPane;

import javafx.scene.layout.VBox;

import javafx.scene.paint.Color;

import javafx.scene.shape.Circle;

import javafx.stage.Stage;

import javafx.util.Duration;

/**

 *

 * @author blj0011

 */

public class JavaFXApplication357 extends Application

{

    @Override

    public void start(Stage primaryStage)

    {

        List<Color> colors = Arrays.asList(Color.RED, Color.BLUE, Color.GREEN, Color.YELLOW, Color.PURPLE);

        AtomicInteger counter = new AtomicInteger(0);

        Circle circle = new Circle(200, Color.TRANSPARENT);

        Timeline timeline = new Timeline(new KeyFrame(Duration.millis(300), (event) -> {

            circle.setFill(colors.get(counter.getAndIncrement() % colors.size()));

        }));

        timeline.setCycleCount(Timeline.INDEFINITE);

        timeline.play();

        Button btn = new Button();

        btn.setText("Stop");

        btn.setOnAction((ActionEvent event) -> {

            timeline.stop();

        });

        VBox root = new VBox(new StackPane(circle), new StackPane(btn));

        Scene scene = new Scene(root, 450, 450);

        primaryStage.setTitle("Hello World!");

        primaryStage.setScene(scene);

        primaryStage.show();

    }

    /**

     * @param args the command line arguments

     */

    public static void main(String[] args)

    {

        launch(args);

    }

}