15.7(使用鼠标改变颜色)

• 编写一个程序，显示一个圆的颜色，当按下鼠标键时颜色为黑色，释放鼠标时颜色为白色

代码展示：编程练习题15_7CircleColor.java

package chapter_15;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;

public class 编程练习题15_7CircleColor extends Application{
	@Override
	public void start(Stage primaryStage) throws Exception {
		StackPane stackPane = new StackPane();
		Circle circle = new Circle(30);
		stackPane.getChildren().add(circle);
		stackPane.setOnMousePressed(e ->{
				circle.setFill(Color.BLACK);
		});
		stackPane.setOnMouseReleased(e ->{
			circle.setFill(Color.WHITE);
		});
		Scene scene = new Scene(stackPane, 300, 150);
        primaryStage.setTitle("编程练习题15_7CircleColor");
        primaryStage.setScene(scene);
        primaryStage.show();
	}
	public static void main(String[] args) {
		Application.launch(args);
	}
}

 结果展示