publicstatic Class forName(String className)
Returns the Class object associated withthe class or interface with the given string name. Invokingthis method is equivalent to:
Class.forName(className,true, currentLoader)
where currentLoader denotes the definingclass loader of the current class.
For example, thefollowing code fragment returns the runtime Class descriptor for theclass named java.lang.Thread:
Class t =Class.forName("java.lang.Thread")
A call to forName("X") causes theclass named X to beinitialized.
Parameters:
className - the fully qualifiedname of the desired class.
Returns:
the Class object for the classwith the specified name.
从官方给出的API文档中可以看出:
Class.forName(className)实际上是调用Class.forName(className,true, this.getClass().getClassLoader())。第二个参数，是指Class被loading后是不是必须被初始化。可以看出，使 用Class.forName（className）加载类时则已初始化。
所以Class.forName(className)可以简单的理解为：获得字符串参数中指定的类，并初始化该类。