redhat 下安装 jdk 时提示 Unpacking JAR files...， javac 又能出来很多命令，这是什么情况？

情况如下，，需要重装么？求高手指点
[root@localhost pub]# rpm -i jdk-7u67-linux-i586.rpm
Unpacking JAR files...
rt.jar...
jsse.jar...
charsets.jar...
tools.jar...
localedata.jar...
jfxrt.jar...
plugin.jar...
javaws.jar...
deploy.jar...

[root@localhost pub]# java
Usage: gij [OPTION] ... CLASS [ARGS] ...
to invoke CLASS.main, or
gij -jar [OPTION] ... JARFILE [ARGS] ...
to execute a jar file
Try `gij --help' for more information.

[root@localhost pub]# javac
Eclipse Java Compiler v_677_R32x, 3.2.1 release
Copyright IBM Corp 2000, 2006. All rights reserved.

Usage: <options> <source files | directories>
If directories are specified, then their source contents are compiled.
Possible options are listed below. Options enabled by default are prefixed
with '+'.

Classpath options:
-cp -classpath <directories and zip/jar files separated by :>
specify location for application classes and sources.
Each directory or file can specify access rules for
types between '[' and ']' (e.g. [-X] to forbid
access to type X, [~X] to discourage access to type X,
[+p/X:-p/*] to forbid access to all types in package p
but allow access to p/X)
-bootclasspath <directories and zip/jar files separated by :>
specify location for

下面的省略了