创建一个请稍候...弹出窗口

此代码可以添加到任何事件，如监听器，按钮等。阻止 JDialog 将出现并将保持到该过程完成。

final JDialog loading = new JDialog(parentComponent);
JPanel p1 = new JPanel(new BorderLayout());
p1.add(new JLabel("Please wait..."), BorderLayout.CENTER);
loading.setUndecorated(true);
loading.getContentPane().add(p1);
loading.pack();
loading.setLocationRelativeTo(parentComponent);
loading.setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
loading.setModal(true);

SwingWorker<String, Void> worker = new SwingWorker<String, Void>() {
    @Override
    protected String doInBackground() throws InterruptedException 
        /** Execute some operation */   
    }
    @Override
    protected void done() {
        loading.dispose();
    }
};
worker.execute(); //here the process thread initiates
loading.setVisible(true);
try {
    worker.get(); //here the parent thread waits for completion
} catch (Exception e1) {
    e1.printStackTrace();
}