While installing an Oracle product, the installer does certain pre-checks and displays results of those checks - success or failure before proceding to show the mail installation window.

Now, there are some situations where a user knows that some of the pre-checks would surely fail e.g. java version etc and hence wants to ignore pre-checks or bypass pre-checks.

This is not advisable, but if you want to do, then start installer using the following - 

./runInstaller -ignoreSysPrereqs

Using "-ignoreSysPrereqs" instructs installer not to perform those checks and directly display the installation window.