Creating 2D Array with given dimensions (Simple)

Question

When creating a 2D array with say 5 rows and 5 columns, do you subtract one when initializing it?

String [][] array;
array = new String [4][4];

Would this create a 5 x 5 array since when you index it starts from 0? Also is there a way to set an array to blank, so for strings it would have all spots containing "" ?

The rules are no different than when creating a one-dimensional array. Do you subtract 1 when creating one of these? — Hovercraft Full Of Eels
– Hovercraft Full Of Eels, Commented Nov 29, 2016 at 4:18
No. Valid indices of an array are 0 to length - 1. Your new String[4][4] would have valid indices 0, 1, 2 and 3. That is a total of 4 (per dimension). — Elliott Frisch
– Elliott Frisch, Commented Nov 29, 2016 at 4:22
This is a good time for you to learn to experiment and Google thoroughly before asking. While elementary questions are acceptable on Stack Overflow, unresearched ones aren't. — castletheperson
– castletheperson, Commented Nov 29, 2016 at 4:30

Saravana · Accepted Answer · 2016-11-29 04:23:03Z

2

no, you should initialize array with the size you need.

To fill array with some default values, use Arrays.fill

String[][] arr = new String[5][5];
for (String[] ar : arr) {
    Arrays.fill(ar, "");
}
System.out.println(Arrays.deepToString(arr));

output

[[, , , , ], [, , , , ], [, , , , ], [, , , , ], [, , , , ]]

answered Nov 29, 2016 at 4:23

Saravana

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Community · Accepted Answer · 2017-05-23 11:59:58Z

1

No you don't need to subtract one while initializing the 2D array as for the setting the values in the array to ""

Arrays.fill(array, "")

original answer here

edited May 23, 2017 at 11:59

CommunityBot

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answered Nov 29, 2016 at 4:23

0xtvarun

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Pritam · Accepted Answer · 2016-11-29 04:22:02Z

0

String [][] array = new String[n][n] where n is the size..so If u want to create 5*5 array..use array = new String[5][5] and index will vary from 0-4

answered Nov 29, 2016 at 4:22

Pritam

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