'Why this .split resulting in array out of bound error? [duplicate]

public class test {
    public static void main(String[] args) {        
        String[] arr = {"0 1.2.3.4","a b.c.d.e"};
        System.out.println(arr[0].split(".")[2]);
    }
}

I am using java 8.

the expected output is 3.

javaarraysstringsplit


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