安装好jdk1.8.0版本，java -help能显示

[root@izuf6fyls0jsr430b2tdr3z ~]# source /etc/profile
[root@izuf6fyls0jsr430b2tdr3z ~]# java -version
java version "1.8.0_11"
Java(TM) SE Runtime Environment (build 1.8.0_11-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.11-b03, mixed mode)

我的jdk安装路径

[root@izuf6fyls0jsr430b2tdr3z ~]# cd /usr/lib/jvm
[root@izuf6fyls0jsr430b2tdr3z jvm]# ls
jdk jdk1.8.0_11 jdk-8u11-linux-x64.tar.gz

javac命令找不到，javac -help不能显示

[root@izuf6fyls0jsr430b2tdr3z jvm]# javac
-bash: javac: command not found
[root@izuf6fyls0jsr430b2tdr3z jdk1.8.0_11]# javac -help
-bash: javac: command not found

查看路径

[root@izuf6fyls0jsr430b2tdr3z jvm]# cd jdk1.8.0_11/
[root@izuf6fyls0jsr430b2tdr3z jdk1.8.0_11]# ls
bin db javafx-src.zip lib man release THIRDPARTYLICENSEREADM
COPYRIGHT include jre LICENSE README.html src.zip THIRDPARTYLICENSEREAD

这个路径下有javac文件

[root@izuf6fyls0jsr430b2tdr3z jdk1.8.0_11]# cd bin
[root@izuf6fyls0jsr430b2tdr3z bin]# ls
appletviewer javadoc jcontrol jmc.ini keytool schemagen
ControlPanel javafxpackager jdb jps native2ascii serialver
extcheck javah jdeps jrunscript orbd servertool
idlj javap jhat jsadebugd pack200 tnameserv
jar java-rmi.cgi jinfo jstack policytool unpack200
jarsigner javaws jjs jstat rmic wsgen
java jcmd jmap jstatd rmid wsimport
javac jconsole jmc jvisualvm rmiregistry xjc

我在 /etc/profile 中设置的 环境变量

set java environment

Java_HOME=/usr/lib/jvm/jdk1.8.0_11
JRE_HOME=/usr/lib/jvm/jdk1.8.0_11/jre
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

大神，帮我看看 为什么

这个java真的真的装了好多天都没有装好
小白在此万分感谢，万分感谢