Class.forName("org.gjt.mm.mysql.Driver").newInstance();

Class.forName("org.gjt.mm.mysql.Driver").newInstance();

和

Class.forName("org.gjt.mm.mysql.Driver")

有什么区别呢？
;

Class.forName("org.gjt.mm.mysql.Driver")
可以导致加载类，返回值是Class类对象

Class.forName("org.gjt.mm.mysql.Driver").newInstance();
除了导致加载类，还会生成相应的Driver对象事例，即返回值是Object对象(实际上是Driver对象)

为什么需要Class.forName("org.gjt.mm.mysql.Driver")呢？看org.gjt.mm.mysql.Driver里的static块

public static Class<?> forName(String className)
  throws ClassNotFoundException
Returns the Class object associated with the class or interface with the given string name.

看方法返回类型Class，与className所表示的类或接口关联



public T newInstance()
  throws InstantiationException,
  IllegalAccessException
Creates a new instance of the class represented by this Class object. The class is instantiated as if by a new expression with an empty argument list. The class is initialized if it has not already been initialized.

创建这个Class对象所表示的类的新实例。会被重新实例化，如果未初始化就还会被初始化。（貌似还有forName后未被初始化的情形啊）