Just started java

Question

Hi i just started java and installed J2re-1_3_1_08-windows-i586-i
I have an XP OS and tryed to type mij first little java program
public class app
public static voi main(String[] args)
System.out.println(" Greats from Java!");
now when i try to run this in xp bij c:\Java app i get mij ms-dos screen so fast that i can not read what it said.
when i run it true cmd and then java app i get an error : Exception in Thread "main" java.lang.noclassdeeffounderror: app
What am i doing wrong

Answer 1

but that line of setclass do i have to put it in the
java program or somewhere else. i did read in the book
that i had to go to systems of windows xp and set a
path but the book did not tell me what path i had to
setActually the path your book was talking about is the windows system path, which is a system environment variable created when you install the os.
You add to this variable the path to java.exe, javac.exe etc...
for example if your sdk directory is C:\j2sdk1.4.2 you add the /bin sub-directory to the path by executing (in a dos window) :
set path = %path%;C:\j2sdk1.4.2\bin
With this you can type directly java, javac etc... on the command line without the os complaining that it doesn't know these commands.
The classpath is something specific to java that has relationship to the system path.