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

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 1 · Answer 2 · 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

2 Answers2