Array Index out of Bound Error when splitting a string

Question

Can someone please help me find the problem with the following code: it keeps giving me an:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0

code

public class Hello{

    public static void main(String[] args){

        String tf = "192.168.40.1";
        String[] arggg = tf.split(".");
        String add = arggg[0];
        System.out.println(add);
    }
}

Have you tried stepping through this with a debugger? What is the length of arggg? What is the parameter for split meant to be? — Jon Skeet
– Jon Skeet, Commented Jul 15, 2015 at 7:56

Codebender · Accepted Answer · 2015-07-15 07:55:31Z

7

. is a special charater in regex. So when using with split() method you need to escape it.

Use,

String[] arggg = tf.split("\\.");

answered Jul 15, 2015 at 7:55

Codebender

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Comments

Lasitha Benaragama · Accepted Answer · 2015-07-15 08:09:12Z

1

So here is the case. Dot is the Reguler Expression and when using Reguler expression with spilt() method it splitting using Reguler expression. You can get more detailed idea about it by following http://www.regular-expressions.info/dot.html link.

What you need to do is use escape charactor and tell split method you need to split using "."

String[] arggg = tf.split("\\.");

will solve your issue.

answered Jul 15, 2015 at 8:09

Lasitha Benaragama

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