String Split method not Giving desired results

Question

I am trying to use Split method of String in java I have example like this.

String number  = Math.random() * 100 + "";
System.out.println("Number is : " + number);
String[] seprate = number.split(".");
System.out.println(seprate.length);

it should give me 2 Stack of array i mean 2 array element if value is like e.g. 67.90512897385857

but its not giving value like that

String number  = Math.random() * 100 + "";
System.out.println("Number is : " + number);
String[] seprate = number.split(".");
System.out.println(seprate.length);
System.out.println(seprate[1]);

its giving arrayindexoutbound exception.

Someone give idea why its giving like that?

score 1 · Accepted Answer · edited May 23 '17 at 10:28

1

The String#split method takes a regular expression.

The "." in there means any character.

Escape your "." as such to signal a literal dot: number.split("\\.").

As Pieter De Bie points out, using java.util.regex.Pattern to safely escape your literals when passing literals to an argument that is going to be interpreted as a regular expression will help you a good deal.

In this case, you could use: number.split(Pattern.quote("."))

edited May 23 '17 at 10:28

Community

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answered Feb 03 '16 at 11:58

Mena

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In addition to this answer: I alwas use string.split(Pattern.quote("possibleRegex")) to make sure that I'm not splitting on regexes – Pieter De Bie Feb 03 '16 at 11:59
@PieterDeBie good point, will add to answer. – Mena Feb 03 '16 at 12:00
you're welcome, you have a small typo in my name though :p – Pieter De Bie Feb 03 '16 at 12:22
@PieterDeBie oops. Fixing now :D – Mena Feb 03 '16 at 12:33

score 1 · Answer 2 · answered Feb 03 '16 at 11:58

1

You need to escape the dot. The split method takes a regular expression. From the docs:

Parameters:regex the delimiting regular expression

String[] seprate = number.split("\\.");

answered Feb 03 '16 at 11:58

kai

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score 1 · Answer 3 · answered Feb 03 '16 at 11:59

1

Split works with regex and you should use like this

number.split("\\.")

answered Feb 03 '16 at 11:59

halil

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score 0 · Answer 4 · answered Feb 03 '16 at 12:00

Pay attention to the documentation:

public String[] split(String regex)

Splits this string around matches of the given regular expression.

In a regular expression, . is any character (except newlines, usually).

So you are splitting at every character.

If you want to match only a dot, "\\." will work.

score 0 · Answer 5 · edited May 23 '17 at 11:59

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Double f = Math.random() * 100;
        String number  = String.valueOf(f);
        System.out.println("Number is : " + number);
        String[] seprate = number.split("\\.");
        System.out.println(seprate.length);

Please use this link for ur question.

The split() method in Java does not work on a dot (.)

edited May 23 '17 at 11:59

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answered Feb 03 '16 at 12:05

Pradeep

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String Split method not Giving desired results

5 Answers5