Compiling in MSDOS Prompt

Good Afternoon,
Below is the error I have recieved.
C:/javac Count.java
'javac' is not reconginezed as an internal or external command,
operable program or batch file.
I know some people have asked this before but the answers did not help me.
I have J2SdK1.4.2_05. I am using windows 2000 Professional.
I have javac.exe so when I type
C:/j2sdk1.4.2_05/bin> javac Count.java
error: cannot read: Count.java
1error
I need to know how to permetally set the path and how to make this program load.
Thank you in advance,
Adver

Sorry I spoke to soon can someone help me with this error?
C:\>javac Count.java
Count.java:8: class ContinueTest is public, should be declared in a file named C
ontinueTest.java
public class ContinueTest{
^
1 error
This is the program I am trying to compile
import javax.swing.JOptionPane;
public class ContinueTest{
public static void main(String args[]) {
String output = "";
for ( int count = 1; count <= 10; count++ ) {
if ( count != 5 ) continue;
output += count + " ";
} // end for
output += "\nRemoved continue to skip printing 5";
JOptionPane.showMessageDialog( null, output );
System.exit(0);
Thank you in advance.

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my test:
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1 Zeile wurde ausgewõhlt.It says
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Version:
SQL*Plus: Release 10.2.0.1.0 - Production on Di Jan 27 12:45:20 2009
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - 64bit Production
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