In order to become re-acquainted with Oracle database development I downloaded and installed Oracle Database 11g and Oracle Developer. During the install of Oracle Database 11g on Windows 8, I opted not to create a database. After Oracle Database 11g was installed, I created my database using the Database Configuration Assistant (DBCC). But when I tried to connect to my database using Oracle Developer, testing the connection failed each time; the reason being that the “network adapter could not establish the connection.”
I managed to solve this issue by using the Net Configuration Assistant to set up a listener for TCP, TCPS, and NPS. Then via the control panel, I had to go to Device Manager, right-click on the root node of the tree and select Add legacy hardware followed by Network Adapters -> Microsoft -> Microsoft KM-Test Loopback Adapter (older versions of Windows: Microsoft Loopback Adapter).
After performing the above configuration, I was able to connect to my Oracle database without a problem.