//没看到会有警告
public static void main(String[] args)throws Exception {
        Class<?> clazz = Class.forName("cn.animal.Cat");
        Animal cat = (Animal)clazz.newInstance();
        System.out.println(cat);
    }

------解决方案--------------------
Java code

BaseUnit bu = null;
    try {
    bu = (BaseUnit)Class.forName(cls.getName()).getConstructor(Context.class).newInstance(context);