Java- How to use For Loop with (Multidimensional) Array of Strings

Question

I was able to use for loop with int multidimensional arrays but I'm unable to reproduce it with multi arrays.

public class array {

public static void main(String[] args) {
    String[][] words = new String[2][3];
    words[0][0] = "a";
    words[0][1] = "b";
    words[0][2] = "c";
    words[1][0] = "d";
    words[1][1] = "e";
    words[1][2] = "f";
   }
}

Would love some help on how to iterate that

For reference, this was what I did for int

int[][] multi = {
        {3, 4, 5},
        {2, 3, 5, 6, 7},
        {112, 3}
    };
    for (int row = 0; row < multi.length; row++) {
        for (int col = 0; col < multi[row].length; col++) {
            System.out.print(multi[row][col] + " ");

for (String[] word : words) { for (String character : word) {...} } — Nir Alfasi
– Nir Alfasi, Commented Feb 27, 2017 at 19:26
try nested loop. for(int i=0;i<rolSizei++) { for(int j=0;j<colSize;j++) {words[i][j] ...}} — Top.Deck
– Top.Deck, Commented Feb 27, 2017 at 19:28
Please edit you question to provide the complete code: somebody who wants to help you should be able to copy your code, paste it in an editor and run it without having to add anything. — Elise van Looij
– Elise van Looij, Commented Feb 27, 2017 at 19:30

ΦXocę 웃 Пepeúpa ツ · Accepted Answer · 2017-02-27 19:39:45Z

1

You are almost there, adapt the for loops, dont forget every row is an array as well.....

    String[][] words = new String[2][3];
    words[0][0] = "a";
    words[0][1] = "b";
    words[0][2] = "c";
    words[1][0] = "d";
    words[1][1] = "e";
    words[1][2] = "f";
    for (int row = 0; row < words.length; row++) {
        for (int col = 0; col < words[row].length; col++) {
            System.out.println(words[row][col]);
        }
    }

answered Feb 27, 2017 at 19:39

ΦXocę 웃 Пepeúpa ツ

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1 Comment

Jeff Ogah Over a year ago

Thank you. This is actually the method I was trying to accomplish, but it seems I inadvertenly tried to mix the other suggestion above (nested foreach loop) with this one. It works perfectly

rpfun12 · Accepted Answer · 2017-03-08 16:01:35Z

1

With Java 8, you can do the following iterate and print the 2d:

Stream.of(words).map(Arrays::toString).forEach(System.out::println);

Output:
a
b
c
d
e
f

Just print as one dimensional arrays using Arrays.toString()

Stream.of(words).map(Arrays::toString).forEach(System.out::println);

Output:

[a, b, c]
[d, e, f]

edited Mar 8, 2017 at 16:01

answered Feb 27, 2017 at 20:10

rpfun12

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2 Comments

Markus Benko Over a year ago

Not exactly. Instead of map(Arrays::toString) you would want to use flatMap(Stream::of). :-)

rpfun12 Over a year ago

Corrected my answer based on ur comment

Ousmane D. · Accepted Answer · 2017-02-27 20:59:54Z

0

How to use For Loop with (Multidimensional) Array of Strings?

String[][] words = new String[2][3];
    words[0][0] = "a";
    words[0][1] = "b";
    words[0][2] = "c";
    words[1][0] = "d";`
    words[1][1] = "e";
    words[1][2] = "f";

Using nested for each loop

One way to accomplish such task is to use nested for each loop, however having said there are other solutions to accomplish the same task.

for(String[] word : words)){
 for(String currentWord : word)System.out.println(currentWord); // this is just explanatory, which you can change with what ever you wish to accomplish with this loop.
}

Another way:

Using nested for loop

for(int i = 0 ;i < 2; i++) {
 for(int j = 0 ;j < 3; j++) {
    System.out.println(words[i][j]); // this is just explanatory, which you can change with what ever you wish to accomplish with this loop.
 }
}

edited Feb 27, 2017 at 20:59

answered Feb 27, 2017 at 19:27

Ousmane D.

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2 Comments

Jeff Ogah Over a year ago

Thank you. The nested foreach loop above works just fine, and is actually preferable now that I know it. I did attempt something like this, but I only declared the first part 'for(String[]word:words){' and then jumped to print. I tried the nested for loop which is the method I was working on but I couldn't get it to work with the code you suggested. I'm not sure if this is because of rowSize & columnSize because changing and using the suggestion below worked.

Ousmane D. Over a year ago

@JeffOgah the nested for loop does work. I will update the answer to show you exactly what you need.

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