Fast way to parse a string into int in Java

Question

Possible Duplicate:
Read large amount of data from file in Java

I have a string like "2 -56 0 78 0 4568 -89..." end so on. Now I use Scanner.nextInt() to parse it, but it seems to be slow. Platform is Android. Any advices how to implement in for better speed?

Thanks.

cl-r · Accepted Answer · 2012-08-20T13:16:54.483

8

use myString.split(" "), which split on ' ', then Integer.valuesOf(..)

edited Aug 20 '12 at 13:16

answered Aug 20 '12 at 12:55

cl-r

1,264
1
12
26

1

StringTokenizer is not recommended for use in newer versions of Java, String split() is recommended. – Oh Chin Boon Aug 20 '12 at 13:09
@ChinBoon you are right, Modified. – cl-r Aug 20 '12 at 13:15
2

`StringTokenizer` has always been faster than `String.split` for simple things like this. – Louis Wasserman Aug 20 '12 at 15:21

score 3 · Answer 2 · answered Aug 20 '12 at 12:58

3

Split the string on the space and parse each entry

for (String s: string.split(" ")) {
  int i = Integer.parseInt(s);
  //do something with i
}

answered Aug 20 '12 at 12:58

Dan

1,030
5
12

score 2 · Answer 3 · answered Aug 20 '12 at 12:56

2

You could go for reading the input as normal String and then using Integer.parseInt() on it.

answered Aug 20 '12 at 12:56

Kazekage Gaara

14,972
14
61
108

score 2 · Answer 4 · answered Aug 20 '12 at 13:00

2

You can use String.split("\\s") and then for each string use Integer.valueOf() to parse to an Integer or Integer.parseInt() to parse to an int.

answered Aug 20 '12 at 13:00

Dan D.

32,246
5
63
79

score 1 · Answer 5 · answered Aug 20 '12 at 13:06

1

  you can use Integer.parseInt(Value of String);

answered Aug 20 '12 at 13:06

G M Ramesh

3,420
9
37
53

Fast way to parse a string into int in Java

5 Answers5