public static MessageTypeForm getInstance() {
        if (messageTypeForm == null) {
            messageTypeForm = new MessageTypeForm();
        }
        return messageTypeForm;
    }
<pre>
MessageTypeForm
</pre>

@author <a href="https://github.com/rememberber">RememBerBer</a>
@since 2019/5/7.
src/main/java/com/fangxuele/tool/push/ui/form/MessageTypeForm.java