They treat all data types the same (as strings). For example, if a table column has Boolean data, the table can display the data in a check box. However, if you use either of the two JTable constructors listed previously, your Boolean data is displayed as a string. You can see this difference in the Vegetarian column of the previous figure.
They require that you put all of the table's data in an array or vector, which may not be appropriate for some data. For example, if you are instantiating a set of objects from a database, you might want to query the objects directly for their values, rather than copying all their values into an array or vector.
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