Question

I have a method where I read data from a DB, it goes like this:

public Collection<Map<String, String>> getAllFieldsValues() throws Exception
...
mapaTemp.put("DNI", dni.toString());
mapaTemp.put("NOMBRE", nombre.toString());
mapaTemp.put("APELLIDOS", apellidos.toString());
mapaTemp.put("CURSO", curso.toString());
mapaTemp.put("DIRECCION", direccion.toString());
allFieldsValues.add(mapaTemp);
...
return allFieldsValues;

Then I have another method to display the data in a JTable, but the problem is that I read it in a different order from what I put it, I read it in this order. DNI,DIRECCION,NOMBRE,APELLIDOS,CURSO.

This is a problem because when I display the data in the JTable it appears in wrong order. Anyone knows why can it be? Thanks!

Answer 1

What type is mapaTemp and how do you read the values from the map? For example a Java HashMap has no order so you cannot expect to get the results in insertion order.

You should be looking at a LinkedHashMap