Question

所以我设定的任务是制作一个灯的动画。添加的按钮可以执行不同的操作，例如更改球体的颜色等。

代码：Sphere Class

 public class Sphere extends JPanel {
private boolean flashinglights = false;
private int x = 168;
private int y = 75;
private Color[] colors = new Color[] {Color.ORANGE, Color.LIGHT_GRAY };
private int colorIndex = 0;

public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D) g;
    Graphics2D g3 = (Graphics2D) g;

    if (!flashinglights) {


        Rectangle box0 = new Rectangle(x+16, y+50,14, 50);
        g3.setColor(Color.black);
        g3.draw(box0);
        g3.fill(box0);

        Rectangle box1 = new Rectangle(x+16, y+90,14, 50);
        g3.setColor(Color.white);
        g3.draw(box1);
        g3.fill(box1);

        Rectangle box2 = new Rectangle(x+16, y+130,14, 50);
        g3.setColor(Color.black);
        g3.draw(box2);
        g3.fill(box2);

        Rectangle box3 = new Rectangle(x+16, y+170,14, 50);
        g3.setColor(Color.white);
        g3.draw(box3);
        g3.fill(box3);


        Rectangle box4 = new Rectangle(x+16, y+210,14, 50);
        g3.setColor(Color.black);
        g3.draw(box4);
        g3.fill(box4);

        Rectangle box5 = new Rectangle(x+16, y+250,14, 50);
        g3.setColor(Color.white);
        g3.draw(box5);
        g3.fill(box5);

        Rectangle box6 = new Rectangle(x+16, y+290,14, 50);
        g3.setColor(Color.black);
        g3.draw(box6);
        g3.fill(box6);

        Rectangle box7 = new Rectangle(x+16, y+330,14, 50);
        g3.setColor(Color.white);
        g3.draw(box7);
        g3.fill(box7);

        Rectangle box8 = new Rectangle(x+16, y+370,14, 50);
        g3.setColor(Color.black);
        g3.draw(box8);
        g3.fill(box8);


        Rectangle box9 = new Rectangle(x+16, y+410,14, 50);
        g3.setColor(Color.white);
        g3.draw(box9);
        g3.fill(box9);

        Rectangle box10 = new Rectangle(x+16, y+450,14, 50);
        g3.setColor(Color.black);
        g3.draw(box10);
        g3.fill(box10);


        g2.setColor(Color.ORANGE);
        Ellipse2D.Double ball = new Ellipse2D.Double(x, y, 50, 50);
        g2.draw(ball);
        g2.fill(ball);
    } else {
        if(colorIndex > colors.length - 1)
            colorIndex = 0;

        Rectangle box0 = new Rectangle(x+16, y+50,14, 50);
        g3.setColor(Color.black);
        g3.draw(box0);
        g3.fill(box0);

        Rectangle box1 = new Rectangle(x+16, y+90,14, 50);
        g3.setColor(Color.white);
        g3.draw(box1);
        g3.fill(box1);

        Rectangle box2 = new Rectangle(x+16, y+130,14, 50);
        g3.setColor(Color.black);
        g3.draw(box2);
        g3.fill(box2);

        Rectangle box3 = new Rectangle(x+16, y+170,14, 50);
        g3.setColor(Color.white);
        g3.draw(box3);
        g3.fill(box3);


        Rectangle box4 = new Rectangle(x+16, y+210,14, 50);
        g3.setColor(Color.black);
        g3.draw(box4);
        g3.fill(box4);

        Rectangle box5 = new Rectangle(x+16, y+250,14, 50);
        g3.setColor(Color.white);
        g3.draw(box5);
        g3.fill(box5);

        Rectangle box6 = new Rectangle(x+16, y+290,14, 50);
        g3.setColor(Color.black);
        g3.draw(box6);
        g3.fill(box6);

        Rectangle box7 = new Rectangle(x+16, y+330,14, 50);
        g3.setColor(Color.white);
        g3.draw(box7);
        g3.fill(box7);

        Rectangle box8 = new Rectangle(x+16, y+370,14, 50);
        g3.setColor(Color.black);
        g3.draw(box8);
        g3.fill(box8);


        Rectangle box9 = new Rectangle(x+16, y+410,14, 50);
        g3.setColor(Color.white);
        g3.draw(box9);
        g3.fill(box9);

        Rectangle box10 = new Rectangle(x+16, y+450,14, 50);
        g3.setColor(Color.black);
        g3.draw(box10);
        g3.fill(box10);

        g2.setColor(colors[colorIndex++]);
         Ellipse2D.Double ball = new Ellipse2D.Double(x, y, 50, 50);
        g2.draw(ball);
        g2.fill(ball);
    }
}

public void chooseflashinglights(){
    flashinglights = true;
}

public void choosesteady(){
    flashinglights = false;
}

public static void main(String[] args) {
    JFrame scFrame = new AnimationViewer();
    scFrame.setTitle("Belisha Beacon");
    scFrame.setSize(400, 500);
    scFrame.setDefaultCloseOperation((JFrame.EXIT_ON_CLOSE));
    scFrame.setVisible(true);
}

}

代码：动画查看器CLass

public class AnimationViewer extends JFrame {
JButton jbtFlash = new JButton("Flash");
JButton jbtSteady = new JButton("Steady");
JPanel bPanel = new JPanel();
Sphere sphPanel = new Sphere();
Timer timer;

public AnimationViewer() {
    timer = new Timer(500, new TimerListener());
    this.add(bPanel, BorderLayout.SOUTH);
    bPanel.add(jbtFlash);
    bPanel.setLayout(new GridLayout(1, 1));
    bPanel.add(jbtSteady);

    this.add(sphPanel, BorderLayout.CENTER);

    jbtFlash.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            sphPanel.chooseflashinglights();
            timer.start();
        }
    });

       jbtSteady.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            sphPanel.choosesteady();
            timer.stop();
            sphPanel.repaint();
        }
    });

}

class TimerListener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
        sphPanel.repaint();
    }
}

}

主要的两个按钮做两件事。一个使球体保持纯橙色（稳定），另一个使球体从橙色变为灰色。（闪烁）

现在出现问题： 当您启动程序时，球体以稳定模式启动，颜色只是纯橙色。

我希望程序以闪烁模式启动。因此，当您单击运行时，球体应该在闪烁阶段笔直，从橙色到灰色直接交替。

那我该如何制作呢？所以我可以先启动一段代码，直接进入闪烁灯模式？

Answer 1

在方法中提取用于将模式切换为闪烁的代码，以避免代码重复：

private void flash() {
    sphPanel.chooseflashinglights();
    timer.start();
}

从动作侦听器调用此方法：

jbtFlash.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        flash();
    }
});

并在构造函数中调用它：

public AnimationViewer() {
    // existing code omitted

    flash();
}

如何使一段代码首先启动Java小错误/最后一小步

1 个答案: