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+package com.client.window;%0A%0Aimport javax.swing.*;%0A%0A/**%0A * Created by form on 2017-07-20.%0A */%0Apublic class WindowController %7B%0A    private static JFrame frame = new JFrame();%0A    private static JPanel panel = new JPanel();%0A%0A    public static JFrame getFrame()%7B%0A        return frame;%0A    %7D%0A    public static JPanel getPanel()%7B%0A        return panel;%0A    %7D%0A    public static void dispose() %7B%0A        frame.dispose();%0A        frame = new JFrame();%0A        panel = new JPanel();%0A    %7D%0A%7D%0A

Create WindowController.java