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Hi, I have a Mac but having problem installing the product ORACLE DEVELOPER I found not connect to a database it say "network adapter could not establish connection".
You need the credentials to some existing database as SQL Developer itself does not come with its own database. That might be a database on some server, or even a database on a local VM running on your Mac. See here for more info: https://www.thatjeffsmith.com/archive/2012/12/i-have-oracle-sql-developer-installed-now-what/