新手求大佬帮忙看看这个报错怎么处理呀。

public class GenericMethod { public static void main(String[] args) { Imessage_msg = (Imessage) Factory.getInstance("messageIMpl",Factory.class); msg.send("www.mldn.cn"); } }

interface Imessage { public void send(String str); }

class MessageIMpl implements Imessage { public void send(String str) { System.out.println("消息发送：" + str); } }

class Factory { public static T getInstance(String className,T t) { if ("messageIMpl".equalsIgnoreCase(className)) { return new MessageIMpl(); } return null; } }