CODEWITHSUNDEEP
javaandroidstring
kjdkfjsdo8
kjdkfjsdo8

Reputation: 107

Android substring

What is an efficient way to get number 17 from the following path?

/contacts/lookup/1217x31-2BN8629/17/data

It works with 

substring(path.lastIndexOf('/') - 2, path.lastIndexOf('/'))

But then it is hardcoded for a number 10-99, and if a number is for example 3, it will return /3 etc.

Upvotes: 1

Views: 325

Answers (2)

dsh
dsh

Reputation: 12234

First: perform each operation only once. Use a local variable to store data that you will need a second time.

Second: you can look for the next '/' character once you have found the last one.

Eg:

final int lastSlashIndex = path.lastIndexOf('/');
final int nextToLastSlashIndex = path.lastIndexOf('/', lastSlashIndex-1);
path.substring(nextToLastSlashIndex+1, lastSlashIndex);

Upvotes: 2

Mureinik
Mureinik

Reputation: 312146

The easiest, IMHO, would be to split the string according to the / character, and take the before-last element:

String[] parts = str.split("/");
String result = parts[parts.length - 2];

Upvotes: 3

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