How to split string from 3 dimension array to new 2 dimension array in java

Question

I have 3-d Array and I want to split at [x][x][0] to make new array.

static String[][][] flight = {
      {
        {"MON,TUE,WED,THU,FRI,SAT,SUN","TG2040","06:55","07:55"},
        {"MON,TUE,WED,THU,FRI,SAT,SUN","TG2042","10:35","11:35"}
      },
      {
        {"MON,TUE,WED,THU,FRI,SAT,SUN","TG2041","08:25","09:20"},
        {"MON,TUE,WED,THU,FRI,SAT,SUN","TG2043","12:05","13:05"}
      }

I want to make a new 2-d array like this.

String[][] flight_of_day = {
{"MON","TG2040","06:55","07:55"},
{"TUE","TG2040","06:55","07:55"},
{"WED","TG2040","06:55","07:55"},
.... // Monday To Sunday of TG2040

{"MON","TG2042","10:35","11:35"},
{"TUE","TG2042","10:35","11:35"},
.... // Monday To Sunday of TG2042

{"MON","TG2041","08:25","09:20"},
{"TUE","TG2041","08:25","09:20"},
.... // Monday To Sunday of TG2041

Instead of using arrays (of arrays)*, define classes and use instances. — rom1v
– rom1v, Commented Feb 3, 2017 at 20:47
Is the 3-D Array an input you have no control over? Because like the other commenter says, classes and instances seems like a more elegant way. — Alex
– Alex, Commented Feb 3, 2017 at 21:40

Mateusz Szewczyk · Accepted Answer · 2017-02-03 22:00:20Z

1

    String[][] flight_of_day =
            Stream.of(flight)
                  .flatMap(Arrays::stream)
                  .flatMap(
                          t -> Arrays.stream(t[0].split(","))
                                     .map(day -> {
                                         String[] tmp = Arrays.copyOf(t, t.length);
                                         tmp[0] = day;
                                         return tmp;
                                     })
                  ).toArray(String[][]::new);

answered Feb 3, 2017 at 22:00

Mateusz Szewczyk

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2 Comments

Youcef LAIDANI Over a year ago

yup you are faster then me +1

Phijak Chanyawiwatkul Over a year ago

Thank you very much. but are you have way to use for-loop?

Mateusz Szewczyk · Accepted Answer · 2017-02-06 22:55:21Z

0

This is iterable example how to do this.

            final List<String[]> tmpList = new ArrayList<>();
    for (String[][] t : flight) {
        if (t == null) {
            continue;
        }
        for (String[] k : t) {
            if (k == null || k.length < 1 || k[0] == null) {
                continue;
            }
            for (String day : k[0].split(",")) {
                String[] tmp = Arrays.copyOf(k, k.length);
                tmp[0] = day;
                tmpList.add(tmp);
            }
        }
    }
    String[][] flight_of_day = tmpList.toArray(new String[tmpList.size()][]);

edited Feb 6, 2017 at 22:55

answered Feb 6, 2017 at 8:47

Mateusz Szewczyk

263 bronze badges

3 Comments

Phijak Chanyawiwatkul Over a year ago

Thank you very much

Phijak Chanyawiwatkul Over a year ago

have error at this statement for(String[][] t:flight){ if(t == null){ continue; }

Mateusz Szewczyk Over a year ago

@PhijakChanyawiwatkul I don't see any problem in this code unless the flight is null then the method should return / throws exception: if(flight == null){ return; }

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