I think, to assign a JTextField in JTable cells is really important for the purpose of JTable cell validation. For many purpose in software development where we use JTable may need to use JTable cell validation and for this validation purpose we may also need to assign and use JTextField in JTable cell. In the given Example, I have assigned and used a JTextField in the Column 2 of the following JTable. Just Copy the code and Run it in your computer.
Sometimes in programming while we do our work with JTable cell, we may need to make the JTable cell Such that it will allow or accept only numeric or number type data from users and will not allow any other type of data in that cell. In the following example(Check the picture), I have made the cells of Column-2 such that they will allow only numeric data and it will show a warning message if any character or string type entry is detected. Just Copy the code and run it.