Re: Confusing facts...

From:

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>

Newsgroups:

comp.lang.java.programmer

Date:

Sun, 15 Apr 2007 13:32:42 -0400

Message-ID:

<46226194$0$90268$14726298@news.sunsite.dk>

getsanjay.sharma@gmail.com wrote:

? What is the actual difference between "import com.mysql.jdbc.driver"
and Class.forName("com.mysql.jdbc.driver") if in the end what they
both do is load the class ? Why is the second one used for Database
code?

import com.mysql.jdbc.Driver;

enables you to write Driver instead of import com.mysql.jdbc.Driver
in the code.

And since you never use that class in your code, then there are
no point.

Class.forName("com.mysql.jdbc.Driver");

loads the class into the JVM.

Which is important for JDBC because the driver when
loaded registers itself with the DriverManager, so when
you call DriverManager.getConnection with an URL starting
with jdbc:mysql: then DriverManager knows about a driver
than can handle it.

? What is the real difference between the run() and start() method of
Thread? I know that we have to overload the run method of Thread while
writing our own threads, but why call start() when we can just call
the run() method itself? Any special reason for going the way around
when the source code of start() in the end is something like:

You call the start method, it starts the thread and calls the run
method you have written.

Arne