Trying to set up JAVA on Linux

Hi Everyone,
I just freshly built a FC5 box to do java development on. It installed the following packages during installation:
java-1.4.2-gcj-compat-1.4.2.0-40jpp_83rh
java-1.4.2-gcj-compat-devel-1.4.2.0-40jpp_83rh
java-1.4.2-gcj-compat-src-1.4.2.0-40jpp_83rh
java_cup-0.10-0.k.1jpp_9fc
java_cup-javadoc-0.10-0.k.1jpp_9fc
java_cup-manual-0.10-0.k.1jpp_9fc
This one, java-1.4.2-gcj-compat-devel has the java utilities, javac, java etc etc. However, now i've downloaded jdk-1_5_0_07-linux-i586 from sun.com and it's installed.
Now when I type javac -v it says this:
Eclipse Java Compiler v_585_R31x, 3.1.2 release, Copyright IBM Corp 2000, 2006. All rights reserved.
I think it's running /usr/bin/javac which is part of the java-1.4.2-gcj-compat-devel.
I don't know what version it's using. I tried to remove v 1.4.2, but it says ant relies on it, which is part of apache.
Also, I know my classpath should be ".", do I need to set up any other environment variable.
Can someone who's been through this before please give me some guidance? Thanks :)

I've got that sorted, it's using the correct version now.
However, i'm getting another issue now:
[root@berenlinux beren]# java Test.class
Exception in thread "main" java.lang.NoClassDefFoundError: Test/class
[root@berenlinux beren]#
i've tried CLASSPATH= <- nothing and CLASSPATH=.

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Hello:
Trying to compile TalkClientApplet.java at:
http://java.sun.com/docs/books/tutorial/deployment/applet/ex5/TalkClientApplet.java
on the jdk1.5.0_06, Windows XP, and I received the following errors:
TalkClientApplet.java:94:incomparable types:boolean and <nulltype>
if(receivedThread ==null){
TalkClientApplet.java:99:incompatible types
found:java.lang.Thread
required:boolean
receiveThread=new Thread(this);
TalkClientApplet.java:100:boolean cannot be dereferenced
receiveThread.start();
TalkClientApplet.java:150:incompatible types
found :<nulltype>
required:boolean
receiveThread=null;
TalkClientApplet.java:186:incomparable types:boolean and <nulltype>
if(receiveThread==null){
TalkClientApplet.java:258:incomparable types:java.lang.Thread and
boolean while (Thread.currentThread()==receiveThread){
Thanks in advance for your help.

Hello:
I am following the code from:
http://java.sun.com/docs/books/tutorial/deployment/applet/ex5/TalkClientApplet.java
which was pointed to from:
http://java.sun.com/docs/books/tutorial/deployment/applet/workaround.html
This is the section:
private void start(boolean onEDT) {
if (DEBUG) {
System.out.println("In start() method.");
if (receiveThread == null) {
trysted = false;
os = null;
is = null;
socket = null;
receiveThread = new Thread(this);
receiveThread.start();
if (DEBUG) {
System.out.println(" Just set everything to null and started thread.");
enableGUI(onEDT);
Thanks

Trying to set up JAVA on Linux

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