第二个JFrame中的组件没有显示

我想通过按下JFrame中的按钮来启动另一个JFrame。但如果我按下按钮它会显示JFrame但不会显示其中的按钮和滑块。

public class MainMenu extends JFrame {

private JFrame klick;
private static final long serialVersionUID = 9002;

public static void main(String[] args) {
    new MainMenu();
}

public MainMenu() {
    buildGUI1();
}
public void buildGUI1() throws NullPointerException {
    setTitle("Hauptmenü");      
    setSize(800, 480);
    setLayout(new GridLayout());
    setAlwaysOnTop(false);
    setLocation((Toolkit.getDefaultToolkit().getScreenSize().width)/4, (Toolkit.getDefaultToolkit().getScreenSize().height)/4);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setResizable(false);
    setVisible(true);
    final JButton startclickbt = new JButton("Start Clicker");
    startclickbt.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            dispose();
            if(klick == null ) {
                klick =new Clicker();
                add(klick);
            }

        }
    });
    add(startclickbt);

    }

}

第二个具有完全相同的构造函数。滑块和按钮不是静态的。在按钮应该出现的地方，屏幕是黑色的。

希望你能帮助我:)

编辑:

public class Clicker extends JFrame {
    private static final long serialVersionUID = 9001;
    protected JPanel panel;
    static Click j = null;
    protected JSlider jsl;
    protected JTextField tf;
    static final int CPS_MIN= 0;
    static final int CPS_MAX= 100;
    static final int CPS_INIT= 25;
    private int amount;
    private boolean visible;
    public int getDelay() {
        return Math.abs(jsl.getValue()-100);
    }
    public int getAmount() {
        return amount;
    }
    public boolean getVisible() {
        return visible;
    }
    public void setOpen(boolean visible) {
        this.visible=visible;
    }
    public Clicker(boolean visible) {
        buildGUI(visible);
        j = new Click(false).addPosition(new Point((Toolkit.getDefaultToolkit().getScreenSize().width)/2, (Toolkit.getDefaultToolkit().getScreenSize().height)/2)).addPosition(new Point(getLocation().x+1, getLocation().y+20));
        while(true) {
            j.runClicks(getDelay());
        }
    }
    public Clicker() {
        buildGUI(true);
        j = new Click(false).addPosition(new Point((Toolkit.getDefaultToolkit().getScreenSize().width)/2, (Toolkit.getDefaultToolkit().getScreenSize().height)/2)).addPosition(new Point(getLocation().x+1, getLocation().y+20));
        while(true) {
            j.runClicks(getDelay());
        }
    }
    public void buildGUI(boolean visible) {
        setTitle("Clicker");
        setSize(340, 200);
        setLayout(new GridLayout());
        setAlwaysOnTop(true);
        setLocation(0, 0);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setResizable(false);
        setVisible(visible);
        final JButton bt1 = new JButton("Schließen");
        bt1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });
        final JButton bt2 = new JButton("Start  ");
        bt2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                j.setClick(true);
            }
        });
        final JButton bt3 = new JButton("Stop       ");
        bt3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                j.setClick(false);
                JOptionPane.showMessageDialog(null, "Klicken gestoppt. Klicks: " + j.getClickAmount());
                j.setClickAmout(0);
            }
        });
        final JButton bt4 = new JButton("StartAnzahl");
        bt4.addActionListener(new ActionListener() {
            private int amount;
            public void actionPerformed(ActionEvent e) {
                String wert = tf.getText();
                try {
                    amount = Integer.parseInt(wert);
                }catch(Exception ee) {
                    JOptionPane.showMessageDialog(null,"Das war keine Zahl oder mehr als ein Integer");
                }
                j.doClick(amount);

            }
        });
        tf = new JTextField("Anzahl gewünschte Clicks max "+ Integer.MAX_VALUE, 10);
        tf.setEditable(true);

        jsl = new JSlider(JSlider.HORIZONTAL,CPS_MIN,CPS_MAX,CPS_INIT);
        jsl.setMinorTickSpacing(5);
        jsl.setMajorTickSpacing(10);
        jsl.setPaintTicks(true);
        jsl.setPaintLabels(true);
        panel = new JPanel();
        panel.addMouseMotionListener(new MouseMotionListener() {
            @Override
            public void mouseDragged(MouseEvent event) {
                j.setClick(false);  
            }
            @Override
            public void mouseMoved(MouseEvent event) {
                j.setClick(false);          
            }
        });
        panel.addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                if(e.getKeyCode() == KeyEvent.VK_F1) {
                    j.setClick(true);
                }
                if(e.getKeyCode() == KeyEvent.VK_F2) {
                    j.setClick(false);
                }
            }
        });

        add(panel);
        add(bt2);
        add(bt3);
        add(bt1);
        add(bt4);
        add(jsl);
        add(tf);
        pack();
    }
}

让setVisible成为你的最后一个…

public void buildGUI1() throws NullPointerException {
    setTitle("Hauptmenü");
    setSize(800, 480);
    setLayout(new GridLayout());
    setAlwaysOnTop(false);
    setLocation((Toolkit.getDefaultToolkit().getScreenSize().width) / 4, (Toolkit.getDefaultToolkit().getScreenSize().height) / 4);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setResizable(false);
    final JButton startclickbt = new JButton("Start Clicker");
    startclickbt.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            dispose();
            if (klick == null) {
                klick = new Clicker();
                add(klick);
                // Add this when you need to add/remove components
                revalidate();
                repaint();
            }
        }
    });
    add(startclickbt);
    // Move to here
    setVisible(true);
}

另外，使用revalidate()和repaint()来鼓励容器在添加新组件时更新其布局

建议:

确保你的UI是在EDT的上下文中启动的，更多细节请参见初始化线程

JFrame

JPanel

使用多个jframe，好/坏的做法?

你有两个紧迫的问题

Clicker从JFrame扩展，但您试图将其添加到另一个容器中，这在Swing中是不可能的，并且会导致异常，但是…
你用while (true)循环阻塞了事件调度线程，这意味着Swing无法处理任何新的事件，包括repaint事件

例如…

public Clicker(boolean visible) {
    buildGUI(visible);
    j = new Click(false).addPosition(new Point((Toolkit.getDefaultToolkit().getScreenSize().width) / 2, (Toolkit.getDefaultToolkit().getScreenSize().height) / 2)).addPosition(new Point(getLocation().x + 1, getLocation().y + 20));
    // This is bad
    while (true) {
        j.runClicks(getDelay());
    }
}
public Clicker() {
    buildGUI(true);
    j = new Click(false).addPosition(new Point((Toolkit.getDefaultToolkit().getScreenSize().width) / 2, (Toolkit.getDefaultToolkit().getScreenSize().height) / 2)).addPosition(new Point(getLocation().x + 1, getLocation().y + 20));
    // This is bad
    while (true) {
        j.runClicks(getDelay());
    }
}

现在，Click看起来像它的UI组件带来了一堆其他的问题，但我们没有代码，所以它是不可能的注释。

直接的解决方案可能是使用:

SwingWorker，参见Worker Threads和SwingWorker了解更多细节
Swing Timer，参见如何使用Swing计时器了解更多细节
普通旧Thread

要记住的事情

SwingWorker

Timer

尝试在构造函数的末尾使用repaint()或revalidate()。并尝试在最后调用setVisible(true)。

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