java一个JFrame的多个实例

Question

在Java中，我有两个类。其中一个包含JFrame。在启动时，该类被调用。JFrame显示

但在另一个类中，当我在它自己的框架上按下一个按钮时，它会打开该类的一个新实例，该实例将生成另一个框架。但它只关注已经打开的旧框架

资料来源：

框架打开。java

public FrameToOpen() {
    JFrame frame = new JFrame();
    // Just the most simple settings to make it appear...
    frame.setSize(400, 200);
    frame.setVisible(true);
}

其他类。java

public OtherClass() {
    JFrame frame = new JFrame();
    JPanel window = new JPanel();
    JButton openFrame = new JButton("Open Frame);
    // Again, just the most simple settings to make it appear with components...
    frame.setSize(400, 200);
    frame.setVisible(true);
    frame.add(window);
    window.setLayout(null);

    window.add(openFrame);
    openFrame.setBounds(5, 5, 100, 30);

    openFrame.addActionListener(this);

    frame.repaint();
    frame.validate();
}

public void actionPerformed(ActionEvent e) {
    Object o = e.getSource();
    if (o == openFrame) {
        // THIS HERE MAKES NEW INSTANCE OF FRAMETOOPEN
        new FrameToOpen();
    }
}

所以，当我按下这个按钮时，它不会打开一个新的画面，而是聚焦在旧的画面上

请帮忙

ServerGUI。java

    if (o == openAdmin) {
        int port;
        try {
            port = Integer.parseInt(portNumber.getText().trim());
        } catch(Exception er) {
            appendEvent("Invalid Port Number.");
            return;
        }

        // FrameToOpen.java. Opening a new instance of that class...
        new ClientGUI("localhost", port, true);
    }

ClientGUI。java

static JFrame frame = new JFrame("Chat Client");
Dimension d = new Dimension(600, 600);
JMenuBar menu = new JMenuBar();

public ClientGUI(String host, int port, boolean isHost) {

        this.isHost = isHost;

        frame.setSize(d);
        frame.setMinimumSize(d);
        //frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setJMenuBar(menu);
        frame.setVisible(true);


        // Everything else in the class is my buttons, lists, editor panes,
        // and socket handling...

}

Answer 1

您将框架变量定义为static：

static JFrame frame = new JFrame("Chat Client");

因此，无论创建了多少实例，该类只创建一次。如果希望将static修饰符作为实例字段，请将其删除