CODEWITHSUNDEEP
java
SacGax
SacGax

Reputation: 157

what does this [] syntax mean?

What does [1] at the end of statement mean?

String magnitudeString = details.split(" ")[1];

Can't it be written like this:

String [] magnitudeString = details.split(" ");

Upvotes: 0

Views: 354

Answers (3)

user1122857
user1122857

Reputation:

It's index of the String[] array that is returned by details.split(" ").

One suggestion use

String [] magnitudeString = details.split(" "); and iterate through.

using

String magnitudeString = details.split(" ")[1]

may give run time exception of array index out of bound

Upvotes: 0

pb2q
pb2q

Reputation: 59617

[1] is indexing an array: the result of String.split() is an array, and [1] is taking the second element from that result.

This is equivalent to:

String strs[] = details.split(" ");
String magnitudeString = strs[1];

So it can't be re-written quite like your suggestion.

Obviously either of these is a problem if the result of split has fewer than 2 elements, so a length check before accessing array elements is prudent, and the immediate form won't allow this.

Upvotes: 11

Kazekage Gaara
Kazekage Gaara

Reputation: 15052

It simply means that the split() method is going to return an array, and you are assigning the content at the second index of that array to your String magnitudeString(keep in mind that indexes start from 0 in Java).

Upvotes: 2

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