How to insert values in two dimensional array programmatically

Question

I want to do this dynamically in java  I know how to insert values in single dimensional array  I am bit confused in two dimensional array    static final String shades               Shades of grey          lightgrey         dimgray         sgi gray 92             Shades of blue          dodgerblue 2         steelblue 2         powderblue            Shades of yellow          yellow 1        gold 1        darkgoldenrod 1             Shades of red          indianred 1         firebrick 1         maroon

User · Answer

You can t  add  values to an array as the array length is immutable  You can set values at specific array positions   If you know how to do it with one-dimensional arrays then you know how to do it with n-dimensional arrays  There are no n-dimensional arrays in Java  only arrays of arrays  of arrays       But you can chain the index operator for array element access   String     x   new String 2     x 0    new String 1   x 1    new String 2    x 0  0     a1          No x 0  1  available x 1  0     b1   x 1  1     b2     Note the dimensions of the child arrays don t need to match

User · Answer

String     shades   new String intSize  intSize       print array in rectangular form  for  int r 0  r lt shades length  r           for  int c 0  c lt shades r  length  c               shades r  c   hello    your value

User · Answer

Think about it as array of array   If you do this str x  y   then there is array of length x where each element in turn contains array of length y  In java its not necessary for second dimension to have same length  So for x i you can have y m and x j you can have y n  For this your declaration looks like  String     test   new String 4     test 0    new String 3   test 1    new String 2    etc

User · Answer

this is output of this program      Scanner s new Scanner  System in   int row  elem  col   Systm out println  Enter Element to insert    elem   s nextInt    System out println  Enter row    row s nextInt    System out println  Enter row    col s nextInt    for  int c row-1  c  lt  row  c          for  d   col-1   d  lt  col   d             array c  d    elem    for c   0  c  lt  size  c          for  d   0   d  lt  size   d             System out print  array c   d              System out println

User · Answer

In case you don t know in advance how many elements you will have to handle it might be a better solution to use collections instead  https   en wikipedia org wiki Java collections framework   It would be possible also to create a new bigger 2-dimensional array  copy the old data over and insert the new items there  but the collection framework handles this for you automatically   In this case you could use a Map of Strings to Lists of Strings   import java util ArrayList  import java util HashMap  import java util List  import java util Map   public class MyClass       public static void main String args              Map lt String  List lt String gt  gt  shades   new HashMap lt  gt              ArrayList lt String gt  shadesOfGrey   new ArrayList lt  gt             shadesOfGrey add  lightgrey            shadesOfGrey add  dimgray            shadesOfGrey add  sgi gray 92             ArrayList lt String gt  shadesOfBlue   new ArrayList lt  gt             shadesOfBlue add  dodgerblue 2            shadesOfBlue add  steelblue 2            shadesOfBlue add  powderblue             ArrayList lt String gt  shadesOfYellow   new ArrayList lt  gt             shadesOfYellow add  yellow 1            shadesOfYellow add  gold 1            shadesOfYellow add  darkgoldenrod 1             ArrayList lt String gt  shadesOfRed   new ArrayList lt  gt             shadesOfRed add  indianred 1            shadesOfRed add  firebrick 1            shadesOfRed add  maroon 1             shades put  greys   shadesOfGrey           shades put  blues   shadesOfBlue           shades put  yellows   shadesOfYellow           shades put  reds   shadesOfRed            System out println shades get  greys   get 0       prints  lightgrey

User · Answer

Try to code below   String     shades   new String 4  3   for int i   0  i  lt  4  i        for int y   0  y  lt  3  y            shades i  y    value

[java] How to insert values in two dimensional array programmatically?

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