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newprouser

i meant if they are included with OS, for eg : like MS debugger, dos etc

@ LS
gotit.

nandini

there're two things...
java compiler : responsible for compiling your java files.

jre : java runtime environment. It's responsile for running the java appliaction. These days almost all the operating system jre with OS itself. In windows you can check it's presence in control panel.

Luke Skywalker

Somw linux distros DVD have compiler also. Fedora 9 DVD had.

newprouser

JRE is well known , I try my best not to use Java appz.

Well the compiler doesn't require the runtime to run right ? It oly provides libraries in destination computer na.

its time they added it to all Linux i guess.

Luke Skywalker

But you will need JRE for running applications & there many runtime exceptions( which are divided into checked & unchecked) also. So JRE is a must also.

newprouser

Oh i just thought its similar to VB runtime.

nandini

you've mixed things.

compiler's job is to convert .java files into .class files(byte codes). So JRE doesn't come into picture here.

JRE is required when you run a java application.
Suppose I write a java application and after compiling I mail that to you, so that you could run it on your system. So for running my application you need JRE and nothing else.

newprouser

what i understand from this is,

you do coding and save it as *.java
after compiling , you get a *.class file

well then how are exe files produced under java. there are many software which depend on java but are actually in EXE format , eg limewire and so on.

nandini

yes yes yes yes yes... you are right.

Now we come to .exe files.
Converting a java application into executable is like robbing it's souls. exe files are platform dependent while java application are platform independent. So when you do convert a java application into executable, it becomes platform dependent. (exe runs on windows only. right?? correct me if i m wrong.)

newprouser

yes you are ...

unless you are on wine (some pun for ya)

Luke Skywalker

It is different to it. JRE is a must. For we runs a bytecode not executables. You are right nandini, it is like robbing soul of java applications.

nandini

yeah.

saurav_k

@npu

If you are just beginning with java ... Throughly go through "JAVA - Complete Reference by Herbert Schildt" ...

I will post in details later ...

dhruvrock2000

Guys , whats your opinion on the book : Java : The Complete Reference by Herbert Schildt... Am currently using it and am finding it quite good. Any other book i should be looking at ?

nandini

Although I haven't gone through this book but I've heard that Herbert Schildt is a a good writer.

If you find that book good then it must be good indeed.

I like Java by Khaled Moughal. Nice book!!!

saurav_k

It is a very good book for JAVA beginners.

newprouser

thanks , will look into that too

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btw setting this PATH thingy is confusing like hell, and javac is not running too if I do that. i still have to go bin directory and compile it myself.


and how to run the bytecode aka class file ?

i tried :

java asdf.class

and it didn't work.

Punch Farce

Did you set the CLASSPATH?

-F

newprouser

I set the path to the bin folder using "path" command in DOS, if thats what you mean by classpath

Punch Farce

No, CLASSPATH is another environment variable which points to the
directory where all your java class files and jar files are there.

-F

something like this:

C:\>env | grep CLASS
CLASSPATH=C:\XMLP562_WIN[1]\XMLP562_WIN\manual\lib\;C:\sample;