How do you determine size of string array java?

Question

How do i read a file and determine the # of array elements without having to look at the text file itself?

String temp = fileScan.toString();
String[] tokens = temp.split("[\n]+");
// numArrayElements = ?

Almost duplicate of: http://stackoverflow.com/questions/453018/number-of-lines-in-a-file-in-java . This has been answered and more effectively. — Menelaos, Sep 22 '13 at 23:29
Unlike C/C++, in Java you can always determine the size of an array using `length`. — Hot Licks, Sep 23 '13 at 01:03

score 5 · Accepted Answer · answered Sep 22 '13 at 23:26

5

Use the length property of the array:

int numArrayElements = tokens.length;

answered Sep 22 '13 at 23:26

Konstantin Yovkov

score 2 · Answer 2 · answered Sep 22 '13 at 23:26

2

The proper expression is tokens.length. So, you can assign numArrayElements like this:

int numArrayElements = tokens.length;

This counts the number of elements in the tokens array. You can count the number of elements in any array in the same way.

answered Sep 22 '13 at 23:26

tbodt

3

Minor detail: `length` does not "count" the number of elements in the array. Rather, it returns the array size which was stored in the array header when the array object was created (and which cannot have changed since). – Hot Licks Sep 23 '13 at 01:05

2 Answers2