What do you want to run? the JDK does not come with an IDE per default,
only with the tools to compile and package your source code.

I would recommend you get Netbeans if you want an IDE.

From the command line usually.  Sun is old school enough that Java runs
first from the command line.  Note that I don't think the default
install process sets up your PATH variable.

As Sabine mentioned your best bet is probably to download an IDE so you
can have an icon to click on when you want to do Java stuff.  NetBeans
is a good IDE.

From the command line.  The installer sets up the runtime environment
with a path but not the compiler.  You need to add that yourself.  The
usual path on a Windows system is C:\Program Files\Java\jdk1.6.0_10\bin.
 Every time you install a new JDK you need to set the path for the
compiler.

I use a text editor to create my source files.  They need to have a
.java extension.  You compile them with the following;

javac MyClass.java

The compiler creates the necessary .class files.  You then run your
program with;

java MyClass

Note the absence of the .class extension.  There is a lot more to it
than that but that will get you started.

On Fri, 31 Oct 2008 00:08:09 -0700 (PDT), David_G
<david.goodmanson@gmail.com> wrote, quoted or indirectly quoted
someone who said :

you run it from the command line, either javac.exe or java.exe.
java.exe will automatically be on the path.

You have to put javac.exe on the path.

See http://mindprod.com/jgloss/javaexe.html
http://mindprod.com/jgloss/javacexe.html
http://mindprod.com/jgloss/jdk.html

Your IDE will automatically invoke Javac.exe and java.exe
see http://mindprod.com/jgloss/ide.html