Slice string in java

Question

How slice string in java? I'm getting row's from csv, and xls, and there for example data in cell is like

14.015_AUDI

How can i say java that it must look only on part before _ ? So after manipulating i must have 14.015. In rails i'll do this with gsub, but how do this in java?

Just to note, using gsub for this in Rails is massive overkill, you should use split, same as Java. — Rym
– Rym, Commented Oct 22, 2012 at 21:38

assylias · Accepted Answer · 2012-08-26 14:10:47Z

28

You can use String#split:

String s = "14.015_AUDI";
String[] parts = s.split("_"); //returns an array with the 2 parts
String firstPart = parts[0]; //14.015

You should add error checking (that the size of the array is as expected for example)

answered Aug 26, 2012 at 14:10

assylias

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3 Comments

Kresten Over a year ago

Could you maybe add a method for actually slicing strings? Or maybe OP could change post title?

AndrewF Over a year ago

If you truly insist on the split method for this, use s.split("_", 2) to waste less work -- but a perhaps more conceptually correct solution is the traditional indexOf+ substring.

ceving Over a year ago

Typical a "slice" is something, which shares storage. split returns two newly allocated strings.

Masood_mj · Accepted Answer · 2016-05-30 16:49:19Z

22

Instead of split that creates a new list and has two times copy, I would use substring which works on the original string and does not create new strings

String s = "14.015_AUDI";
String firstPart = s.substring(0, s.indexOf("_"));

edited May 30, 2016 at 16:49

answered Aug 26, 2012 at 14:28

Masood_mj

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5 Comments

Hayi Over a year ago

indexof must be changed in indexOf

Masood_mj Over a year ago

@Youssef, Thanks fixed

alreadytaken Over a year ago

This is wrong, it returns AUDI. Needs to be String firstPart = s.substring(0, s.indexOf("_")+1); OP wanted 14.015

Masood_mj Over a year ago

Thanks, I fixed it

Lian Over a year ago

At least in Java 8, substring creates new strings, see in String.java line 2709ff:

return isLatin1() ? StringLatin1.newString(value, beginIndex, subLen)                           : StringUTF16.newString(value, beginIndex, subLen);

In StringUTF16, line 1179, then for example: return new String(Arrays.copyOfRange(val, index << 1, last << 1), UTF16);

Balázs Édes · Accepted Answer · 2012-08-26 14:10:58Z

4

String str = "14.015_AUDI";
String [] parts = str.split("_");

String numberPart = parts[0];
String audi = parts[1];

answered Aug 26, 2012 at 14:10

Balázs Édes

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Comments

Zon · Accepted Answer · 2017-06-27 05:51:43Z

2

Should be shorter:

"14.015_AUDI".split("_")[0];

answered Jun 27, 2017 at 5:51

Zon

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5 Comments

Raúl Salinas-Monteagudo Over a year ago

You do not use any error handling here. Bad. In this case it can be acceptable because the split() of an empty string will yield an array with a single empty string, but if you wanted to access element [1], you would get an exception. Always check possible errors!!

Zon Over a year ago

This is just an example of operation. If you need more functionality - you have to write your own program.

AndrewF Over a year ago

Shorter than what? If you love the split method for this, you should pass a limit like .split("_", 2) to save memory and time.

Zon Over a year ago

This is outside of the question. The first rule of optimization - do not optimize. If it is needed - that's another question.

Bharata Over a year ago

On this way we can detect JavaScript developer – all should be shorter! ;-) I think it is better because the Java class file is small. Поздравляю с 10000! ;-)

score 1 · Accepted Answer · 2023-01-27 16:38:27Z

1

you can use substring!

"substring(int begIndex, int endIndex)"

eg:

String name  = "14.015_AUDI";
System.out.println(name.substring(0,6));

edited Jan 27, 2023 at 16:38

answered Jan 26, 2023 at 9:44

user19921349

Comments

Kurru · Accepted Answer · 2013-10-17 23:10:14Z

0

Guava has Splitter

List<String> pieces = Splitter.on("_").splitToList("14.015_AUDI");
String numberPart = parts.get(0);
String audi = parts.get(1);

answered Oct 17, 2013 at 23:10

Kurru

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