Transform a List of List into into a List of another object

Question

I use a method which returns a list of Lists. This List contains 6 Lists, each List contains 3 String : [[5, 0.01, 2], [7, 0.01, 3], [3, 0.02, 2], [8, 0.05, 3],[9, 0.1, 2], [6, 0.1, 3]]

Continuing from a previous answer...

But I have to split again this list in 3 differents values : [3, 0.01, 2]

The main goal is to transform this list of object in list of Change. A Change :

public class Change {
  private static final String value;
  private static final String amount;
  private static final String column;
...
}

I attempted but I think it's not the greatest way to accomplish :

List saisie = ServiceTableau.getInstance().deserialiser(quantites);
List<String> saisieToStrings = new ArrayList<String>();

for (Object object : saisieIHM) {
    saisieIHMToStrings.add(object != null ? object.toString() : null);
}

Is there a system method to do this? I can't use external libraries

Are you sure the fields in Change should be static?

fabian
– fabian

2014-05-23 13:18:14 +00:00
Commented May 23, 2014 at 13:18 — fabian
– fabian, Commented May 23, 2014 at 13:18
Indeed while testing the solution I change it ;)

jayjaypg22
– jayjaypg22

2014-05-24 08:59:03 +00:00
Commented May 24, 2014 at 8:59 — jayjaypg22
– jayjaypg22, Commented May 24, 2014 at 8:59

nickb · Accepted Answer · 2014-05-23 13:17:19Z

1

Create a constructor in your Change class:

public Change( String input) {
    String[] values = input.split(",");
    this.value = values[0];
    this.amount = values[1];
    this.column = values[2];
}

And then pass that string when you create the list:

List<Change> saisieToStrings = new ArrayList<Change>();
for (Object object : saisieIHM) {
    saisieIHMToStrings.add( new Change( object.toString()));
}

answered May 23, 2014 at 13:17

nickb

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1 Comment

DirkyJerky Over a year ago

Constructor should throw illegal argument EX if the input is not made correctly, proposed change.

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