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Thread: Installing jdk, first time with ubuntu - need help.

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i'm bit lost how start java development on ubuntu 11.10.
(not sure if right place :/)

here's i've done far:
installed openjdk-7-jdk, assume...
used "apt-get install openjdk-7-jdk" , finished without error.

after installing jdk, installed geany (because reminds me of textpad) using:
"apt-get install geany"

when using "java -version" in terminal here result:
code:
:~$ java -version java version "1.6.0_23" openjdk runtime environment (icedtea6 1.11pre) (6b23~pre11-0ubuntu1.11.10) openjdk server vm (build 20.0-b11, mixed mode)
i wrote simple program display name of user, , compiled in geany, when try execute terminal window pops displaying message:

code:
exception in thread "main" java.lang.unsupportedclassversionerror: namesdialog : unsupported major.minor version 51.0     @ java.lang.classloader.defineclass1(native method)     @ java.lang.classloader.defineclass(classloader.java:634)     @ java.security.secureclassloader.defineclass(secureclassloader.java:142)     @ java.net.urlclassloader.defineclass(urlclassloader.java:277)     @ java.net.urlclassloader.access$000(urlclassloader.java:73)     @ java.net.urlclassloader$1.run(urlclassloader.java:212)     @ java.security.accesscontroller.doprivileged(native method)     @ java.net.urlclassloader.findclass(urlclassloader.java:205)     @ java.lang.classloader.loadclass(classloader.java:321)     @ sun.misc.launcher$appclassloader.loadclass(launcher.java:294)     @ java.lang.classloader.loadclass(classloader.java:266) not find main class: namesdialog. program exit.   ------------------ (program exited code: 1) press return continue
i assume i'm making obvious error , simple answer stuff running appreciated. let me know if need re-thread in different part of forums! please clear , concise possible instructions because getting started linux , java alike.

what command did use execute code? more missing classpath me.


Forum The Ubuntu Forum Community Ubuntu Specialised Support Development & Programming Programming Talk [SOLVED] Installing jdk, first time with ubuntu - need help.


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