How to get the total length of a two dimensional array? Java

Question

Suppose that I have a two dimensional array holding 8 teams (rows) and in each team there is 12-15 players. Is there a way to know the total amount of players exist in String teams[][] (WITHOUT looping)?

Check http://stackoverflow.com/questions/4441099/how-do-you-count-the-elements-of-an-array-in-java — Anonymous Coward, Sep 18 '15 at 10:47
possible duplicate of [Getting the array length of a 2D array in Java](http://stackoverflow.com/questions/4000169/getting-the-array-length-of-a-2d-array-in-java) — Sumit Singh, Sep 18 '15 at 10:47
possible duplicate of [Get the size of a 2D array](http://stackoverflow.com/questions/4111393/get-the-size-of-a-2d-array) — David Herrero, Sep 18 '15 at 10:48

score 3 · Answer 1 · answered Sep 18 '15 at 10:53

3

You can do it with streams:

long players = Arrays.stream(teams).flatMap(team -> Arrays.stream(team)).count();

answered Sep 18 '15 at 10:53

OldCurmudgeon

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... which "loops" behind the scenes :-) – Stephen C Sep 18 '15 at 11:00

score 2 · Accepted Answer · answered Sep 18 '15 at 10:50

2

No there is no native Java functionality for this. There is no way you can calculate this without looping.
So you have to use loop and count element.

answered Sep 18 '15 at 10:50

Sumit Singh

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This is the answer I was looking for! Thanks!! – bad Sep 18 '15 at 10:51

score 1 · Answer 3 · answered Sep 18 '15 at 10:51

You have to do it manually. Use something like this:

    int count = 0;
    for(int i = 0; i < teams.length;  i++)
        for(int j = 0; j < teams[i].length; j++)
            if(a[i][j] != null)
                count++;
    return count;

This assumes that fields in the array that do not contain a team member are simply null.

How to get the total length of a two dimensional array? Java

3 Answers3