The package access is something that allows programmers to use their sloppy programming techniques while writing code within one package, but then they have to reconsider it when making more packages. It is a compromise between good business practices and the ugly reality. Like: write some spaghetti code, if you insist, but please leave the ugly mess within the package; at least create some nicer interfaces among the packages.
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solved What package level access needed in Java for? [closed]