How to sort String array by its component? Java

Question

Date,Lat,Lon,Depth,Mag
20000101,34.6920,-116.3550,12.30,1.21
20000101,34.4420,-116.2280,7.32,1.01
20000101,37.4172,-121.7667,5.88,1.14
20000101,-41.1300,174.7600,27.00,1.90
20000101,37.6392,-119.0482,2.40,1.03
20000101,32.1790,-115.0730,6.00,2.44
20000101,59.7753,-152.2192,86.34,1.48
20000101,34.5230,-116.2410,11.63,1.61
20000101,59.5369,-153.1360,100.15,1.62
20000101,44.7357,-110.7932,4.96,2.20
20000101,34.6320,-116.2950,9.00,1.73

I need to sort these data by each criterion

I tried Double.parseDouble(array[0].split(",").[1]) but takes too much time using Selection Sort

Is there any way to just sort by not using parseDouble?

Too much time? How much data have you got? I presume it's more than the 12 lines you have above, because sorting 12 lines should take pretty much no time at all no matter which sort algorithm you use. — Greg Hewgill, Oct 23 '14 at 23:16
You should probably write a few different `Comparator`(s); one to sort by each column you need to sort by. — Elliott Frisch, Oct 23 '14 at 23:18
what is expected result? do you need to sort the each line or the whole ? — Kick Buttowski, Oct 23 '14 at 23:18

score 2 · Answer 1 · answered Oct 23 '14 at 23:19

You have strings that you want to sort by a certain substring interpreted as a Double, so no way around parsing them. But if you parse each line once, and save those results to sort on, that will be faster than calling parseDouble within each comparison.

score 1 · Answer 2 · answered Oct 23 '14 at 23:19

1

I suppose you could create a class that represents the data on each line. Parse the data into instances of that class and then sort on the objects.

answered Oct 23 '14 at 23:19

Zymus

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How to sort String array by its component? Java

2 Answers2