NetBeans no funciona

baje netbeans pro instalar o quitar sofware, trate de abrir, pero solo aparecio la barrita que indica que un prgrama se abre sin embargo no se abrio, lo abri por ternimal como root y me salio esto

.
[root@localhost zhelo]# netbeans
Cannot find java. Please use the --jdkhome switch.

sin embargo tengo instado el jdk:
.
[root@localhost zhelo]# java
Usage: java [-options] class [args...]
(to execute a class)
or java [-options] -jar jarfile [args...]
(to execute a jar file)
where options include:
-d32 use a 32-bit data model if available
-d64 use a 64-bit data model if available
-client to select the "client" VM
-server to select the "server" VM
-hotspot is a synonym for the "client" VM [deprecated]
The default VM is server,
because you are running on a server-class machine.

-cp
-classpath
A : separated list of directories, JAR archives,
and ZIP archives to search for class files.
-D=
set a system property
-verbose[:class|gc|jni]
enable verbose output
-version print product version and exit
-version:
require the specified version to run
-showversion print product version and continue
-jre-restrict-search | -jre-no-restrict-search
include/exclude user private JREs in the version search
-? -help print this help message
-X print help on non-standard options
-ea[:
...|:]
-enableassertions[:
...|:]
enable assertions with specified granularity
-da[:
...|:]
-disableassertions[:
...|:]
disable assertions with specified granularity
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
-agentlib:
[=]
load native agent library
, e.g. -agentlib:hprof
see also, -agentlib:jdwp=help and -agentlib:hprof=help
-agentpath:
[=]
load native agent library by full pathname
-javaagent:[=]
load Java programming language agent, see java.lang.instrument
-splash:
show splash screen with specified image
See http://java.sun.com/javase/reference for more details.