Getting the length of two-dimensional array

Question

How do I get the second dimension of an array if I don t know it  array length gives only the first dimension    For example  in  public class B       public static void main String    main           int       nir   new int  2   3           System out println nir length             how would I get the value of the second dimension of nir  which is 3    Thanks

User · Answer

You can do     System out println nir 0  length     But be aware that there s no real two-dimensional array in Java  Each  first level  array contains another array  Each of these arrays can be of different sizes  nir 0  length isn t necessarily the same size as nir 1  length

User · Answer

nir 0  length   Note 0  You have to have minimum one array in your array  Note 1  Not all sub-arrays are not necessary the same length

User · Answer

In the latest version of JAVA this is how you do it   nir length   is the first dimension nir 0  length   is the second dimension

User · Answer

which 3   You ve created a multi-dimentional array  nir is an array of int arrays  you ve got two arrays of length three   System out println nir 0  length      would give you the length of your first array    Also worth noting is that you don t have to initialize a multi-dimensional array as you did  which means all the arrays don t have to be the same length  or exist at all    int nir       new int 5     nir 0    new int 5   nir 1    new int 3   System out println nir 0  length      5 System out println nir 1  length      3 System out println nir 2  length      Null pointer exception

User · Answer

int secondDimensionSize   nir 0  length    Each element of the first dimension is actually another array with the length of the second dimension

User · Answer

use      System out print  nir 0  length     look at this for loop which print the content of the 2 dimension array the second loop iterate over the column in each row   for int row  0   row  lt  ntr length    row   for int column  0  column lt ntr row  length   column      System out print ntr row  column

User · Answer

Assuming that the length is same for each array in the second dimension  you can use  public class B        public static void main String    main       int       nir  new int  2   3       System out println nir 0  length

User · Answer

Here s a complete solution to how to enumerate elements in a jagged two-dimensional array  with 3 rows and 3 to 5 columns        String row           int     myArray     11  12  13    14  15  16  17    18  19  20  21  22        for  int i 0  i lt myArray length  i              row    n           for  int j   0  j lt myArray i  length  j                  row    myArray i  j                              JOptionPane showMessageDialog null   myArray contains     row

User · Answer

Remember  2D array is not a 2D array in real sense Every element of an array in itself is an array  not necessarily of the same size   so  nir 0  length may or may not be equal to nir 1  length or nir 2 length   Hope that helps

User · Answer

initializing few values int     tab   new int           1 0 1 0 1 0 1 0        0 1 0 1 0 1 0 1        1 0 1 0 1 0 1 0        0 1 0 1 0 1 0 1        1 0 1 0 1 0 1 0        0 1 0 1 0 1 0 1        1 0 1 0 1 0 1 0        0 1 0 1 0 1 0 1        tab length in first loop for  int row   0  row  lt  tab length  row            tab 0  length in second loop     for  int column   0  column  lt  tab 0  length  column                    printing one value from array with space         System out print tab row  column                     System out println       new row   new enter

User · Answer

Expansion for multi-dimension array total length   Generally for your case  since the shape of the 2D array is  squared    int length   nir length   nir 0  length    However  for 2D array  each row may not have the exact same number of elements  Therefore we need to traverse through each row  add number of elements up   int length   0  for   int lvl   0  lvl  lt   levels length  lvl           length     levels  lvl   length      If N-D array  which means we need N-1 for loop to get each row s size

[java] Getting the length of two-dimensional array

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