Split String by length in java [duplicate]

Question

Possible Duplicate:
Split string to equal length substrings in Java

I have a String[] data-structure, which is like this

0.1953601.3675211.3675214.1025640.5860811.36752110.3540903.711844-5.2747252.539683

I want to split this into an array like this

so after the decimal the values have 6 significant figures

I tried using regex solution from this question but it doesnt seem to work.

even this

System.out.println(Arrays.toString(
  "Thequickbrownfoxjumps".split("(?<=\\G.{4})")
));

gives me an output of [Theq, uickbrownfoxjumps] not [Theq, uick, brow, nfox, jump, s] how I would expect it to.

@SeanPatrickFloyd yes, I addressed that in the question itself. that solution provided there doesn't seem to work — Jonathan
– Jonathan, Commented Nov 9, 2012 at 17:17
Please take in account my proposal to correct your assertion about the items length — Aubin
– Aubin, Commented Nov 9, 2012 at 17:45

Aubin · Accepted Answer · 2012-11-09 19:42:18Z

4

The assertion

the size of each value is 8, but if the value is negative its 9

in the question is false because if I split the entry manually here is the result:

0.195360
1.367521
1.367521
4.102564
0.586081
1.367521
10.35409
03.71184   <<< As you can see, it's not that you want
4-5.2747   <<< It's not a number
252.5396
83         <<< Bang! too short

I presume the true assertion is "the number of digit after dot is 6", in this case the split becomes:

The code is here:

static String[] split( String in ) {
   List< String > list = new LinkedList< String >();
   int dot = 0;
   for( int i = 0; dot > -1 && i < in.length(); i = dot + 7 ) {
      dot = in.indexOf( '.', i );
      if( dot > -1 ) {
         int last = Math.min( dot + 7, in.length());
         list.add( in.substring( i, last ));
      }
   }
   return list.toArray( new String[list.size()]);
}

edited Nov 9, 2012 at 19:42

answered Nov 9, 2012 at 17:28

Aubin

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9 Comments

CosmicGiant Over a year ago

It's possible the assumption is incorrect, as 1.367521->10.354090 might be 1.3675211->0.354090, for example. But I also believe guesstimating by the number digits after the dot to be the most reasonable logic. [+1]

Jonathan Over a year ago

@Aubin your assumption might be right. Its eeg data so it might be how you are describing it. I just got the text file, the original data I'll have to go to the lab and check. But regarding the code, I am getting an error for linkedlist its saying '<>' operator is not allowed for source level below 1.7

Jonathan Over a year ago

and since I am working in android if I change the level it says Android requires compiler compliance level 5.0 or 6.0. Found '1.7' instead

Aubin Over a year ago

Yes, my answer was Java 1.7, I'll edit it to compile in 6

Jonathan Over a year ago

@Aubin yes I had fixed that. But the program is still crashing. Now not because of the same error though

|

Miserable Variable · Accepted Answer · 2012-11-09 17:17:50Z

0

Not a great application of regular expression IMHO:

 while not end-of-string
   if next-char is "-"
      take next 9 chars
   else
      take next 8 chars

answered Nov 9, 2012 at 17:17

Miserable Variable

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1 Comment

Aubin Over a year ago

It doesn't work since the spec is erroneous

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