[root@localhost ~]# echo $PATH
/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/usr/java/j2sdk1.4.2_13/bin:/root/bin
[root@localhost ~]# echo $CLASSPATH
.:/usr/java/j2sdk1.4.2_13/lib/dt.jar:/usr/java/j2sdk1.4.2_13/lib/tools.jar
[root@localhost ~]# java -version
java version "1.4.2"
gij (GNU libgcj) version 4.1.0 20060304 (Red Hat 4.1.0-3)

Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

还是不是说是sun 有关的 ！编译器还是用系统自带的
[root@localhost ~]# javac -version
Eclipse Java Compiler v_585_R31x, 3.1.2 release, Copyright IBM Corp 2000, 2006. All rights reserved.