Some would say abstract data types are not OOP -- OOP is defined by how it's different from ADTs: https://www.cs.utexas.edu/~wcook/Drafts/2009/essay.pdf https:/

Some would say abstract data types are not OOP -- OOP is defined by how it's different from ADTs: https://www.cs.utexas.edu/~wcook/Drafts/2009/essay.pdf https://www.cs.utexas.edu/~wcook/Drafts/2009/essay.pdf