Setters are just a naming convention. Methods that behave like public variables begin with the lower-case letters set followed by the camel-case name of the internal associated private, possibly virtual, variable, e.g. setWidth(). Setters with a boolean parameter also begin with the letters set e.g. setVisible( true );
Modern IDEs (Integrated Development Environments) such as IntelliJ Idea will compose a set of getters and setters for you, given just the private instance variables.
Normally within a class you don’t usually use the setters; you go direct to the underlying instance variables, though sometimes it makes sense from a maintenance point of view to channel through setters. Within a package or from outside, you would nearly always go through setters rather than going to directly to public instance variables.
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