JDeveloper not working in ubuntu

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http://askubuntu.com – I don't know where I went wrong but here are the steps which I follow to install JDeveloper. Downloaded JDeveloper installation file from oracle website of linux flavour. From the terminal I wrote sudo chmod 777 JDeveloperFile.bin. Then ./JDeveloperFile.bin. After the extraction took place the terminal showed that it can't load GUI so the installation took place through terminal. After all the default steps were completed with default settings. I went to the directory where it was installed e.g. /user/oracle/middleware/etc... There was jdeveloper.exe file and I was amazed that why is the (HowTos)