Question

任务是为Belisha Beacon编写代码，该代码以闪烁开始，颜色在浅灰色和橙色之间交替显示，并且有两个按钮，分别为Flash和Steady。因此，当我点击Steady按钮时，Beacon必须保持为Orange但是对于我的程序，当我点击Steady按钮时，Beacon保持稳定，当我点击后点击Flash按钮时稳定的按钮，Beacon不会再次闪烁。这是我的代码到目前为止，有人请帮助我，我出错了，谢谢你:)。

import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import javax.swing.Timer;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class BelishaBeacon {
    private static Timer timer;
    public class Drawing extends JPanel {

        private int x = 125;
        private int y = 80;
        private boolean changeColors = false;


        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2 = (Graphics2D) g;
            //creating the shapes
            Rectangle box1 = new Rectangle(165, 180, 20, 45);
            Rectangle box2 = new Rectangle(165, 225, 20, 45);
            Rectangle box3 = new Rectangle(165, 270, 20, 45);
            Rectangle box4 = new Rectangle(165, 315, 20, 45);
            Rectangle box5 = new Rectangle(165, 360, 20, 45);
            Rectangle box6 = new Rectangle(165, 405, 20, 45);

            //drawing the shapes
            Ellipse2D.Double ball = new Ellipse2D.Double(x, y, 100, 100);
            g2.draw(ball);
            g2.draw(box1);
            g2.draw(box2);
            g2.draw(box3);
            g2.draw(box4);
            g2.draw(box5);
            g2.draw(box6);
            //coloring the shapes
            g2.setColor(Color.BLACK);
            g2.fill(box1);
            g2.fill(box3);
            g2.fill(box5);
            g2.setColor(Color.ORANGE);
            g2.fill(ball);
            changeColors = !changeColors;
            if (changeColors) {
                g2.setColor(Color.darkGray);
                g2.fill(new Ellipse2D.Double(x, y, 100, 100));
            }
        }




        public void changeColors() {
            changeColors = true;
            repaint();
        }
    }

    public BelishaBeacon() {
        //Creation of frame
        JFrame frame = new JFrame();
        frame.setSize(350, 570);
        frame.setTitle("Belisha Beacon");
        frame.setLayout(new BorderLayout(0, 0));
        final Drawing shapes = new Drawing();

        timer = new Timer(500, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                shapes.repaint();
            }
        });



        JButton jbtFlash = new JButton("Flash");
        jbtFlash.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {


            }
        });




        final JButton jbtSteady = new JButton("Steady");
        jbtSteady.addActionListener(
                new ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                        timer.stop();
                    }
                });

        //Positioning
        JPanel controlPanel = new JPanel();
        controlPanel.setLayout(new GridLayout(1, 2, 0, 0));
        controlPanel.add(jbtFlash);
        controlPanel.add(jbtSteady);

        frame.add(controlPanel, BorderLayout.SOUTH);
        frame.add(shapes);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        new BelishaBeacon();
        timer.start();
    }
}

Answer 1

因此，对于Flash按钮，侦听器当前为空。您要做的是检查按下闪光按钮时再次启动计时器。

试试这个

JButton jbtFlash = new JButton("Flash");
    jbtFlash.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            System.out.println("Flashing");
            if (!timer.isRunning()) {
                timer.start();
            }

        }
    });

对于你的稳定按钮问题。目前没有逻辑来检查当前颜色是什么，即它是灰色还是黄色。因此，您需要以某种方式修改代码以检查当前颜色状态，并在黄色时停止它。有一些想法：）

Belisha Beacon Java程序按钮查询

1 个答案: