splitting arrays

[Bernard Sigmund Gustav]

hi

i have an array of strings and i want to split the string in each index and place it in a two dimensional array

strings are split using the .split("delimeter"); method

i would just like to know what the equivalent method for that is

thanks

[Joni Salonen]

There is no method; you need to write a loop.
http://java.sun.com/docs/books/tutorial/java/data/arraybasics.html

[Christophe Verré]

The equivalent for what ?
There is a split() method in the String class.

[Bernard Sigmund Gustav]

how then do you split the values inside the array?
like for example in array[0], i have the String "1,D1254H35,x,MS,FOL"
and i want to split those separated by a comma it into diffent entries?

[Christophe Verré]

split() returns a array of strings (String[])

[Bernard Sigmund Gustav]

split works for splitting strings

i want to split strings in an ARRAY.

also, another question.

in two dimensional arrays,can i populate the rows first, and then the columns much later? how is that done?

[Garrett Rowe]

split works for splitting strings

i want to split strings in an ARRAY.

How about:

List<String[]> splitList = new ArrayList<String[]>();
 
for (String e : array)
{
   splitList.add(e.split(delimiter));
}

[ February 20, 2006: Message edited by: Garrett Rowe ]

[Garrett Rowe]

//Initialize a 2-d array with 5 rows
String[][] twoD = new String[5][];
 
//Initialize the columns to whatever you like
for (int i = 0; i < twoD.length; i++)
{
   twoD[i] = new String[i + 1];
}
/** Makes a 2-d array that looks like
[]
[][]
[][][]
[][][][]
[][][][][]*/

[ February 20, 2006: Message edited by: Garrett Rowe ]

[Bernard Sigmund Gustav]

Originally posted by Garrett Rowe:

//Initialize a 2-d array with 5 rows
String[][] twoD = new String[5][];
 
//Initialize the columns to whatever you like
for (int i = 0; i < twoD.length; i++)
{
   twoD[i] = new String[i + 1];
}
/** Makes a 2-d array that looks like
[]
[][]
[][][]
[][][][]
[][][][][]*/

[ February 20, 2006: Message edited by: Garrett Rowe ]

thanks a lot.
i'll try that one. i'll try to understand it first though

is that how a twodimensional array is populated?
coz i want to populate the 5 rows first, and after 5 values are put in, i then want to populate the inner array. the sizes are constant by the way.
i mean the twod array is

String[][] twoD = new String[20][10];

thanks

[Bernard Sigmund Gustav]

Originally posted by Garrett Rowe:

List<String[]> splitList = new ArrayList<String[]>();
 
for (String e : array)
{
   splitList.add(e.split(delimiter));
}

[ February 20, 2006: Message edited by: Garrett Rowe ]

it doesn't work

[Bernard Sigmund Gustav]

to populate the twoD array, this is what i did and it doesn't work
what is wrong with what i'm doing?

String [ ][ ] entryfields = new String[entlen][10];
for(int g=0; g<entlen; g++)
{
entryfields[g][0] = entry[g];
out.print(entryfields[g][0]);
}

[Garrett Rowe]

Originally posted by shuini gustav:

List<String[]> splitList = new ArrayList<String[]>();
 
for (String e : array)
{
   splitList.add(e.split(delimiter));
}

[ February 20, 2006: Message edited by: Garrett Rowe ]<hr></blockquote>

it doesn't work[/QB]

It works. How are you using it?

import java.util.*;
public class Mnemonics
{
   public static void main(String[] args)
   {
      String[] mnemonics =
      {
         "Every,Good,Boy,Does,Fine", //Treble clef
         "Have,No,Fear,Of,Ice,Cold,Beer",//Diatomic molecules
         "Farms,Need,Big,Red,Tractors",//Java escapables
         "May,I,Have,A,Large,Container,Of,Coffee",//first 7 digits of pi
         "Mary's,Violet,Eyes,Make,John,Stay,Up,Nights,Praying",//planets
         "King,Phillip,Called,Out,Fifty,Good,Soldiers"//Biological groupings
      };
 
      List<String[]> mnemonicList = new ArrayList<String[]>();
      String delimeter = ","; //Split Strings by commas
 
      for (String e : mnemonics)
      {
         mnemonicList.add(e.split(delimeter));
      }
 
      for (String[] f : mnemonicList)
      {
         for (String g : f)
         {
            System.out.print(g.charAt(0) + " ");
         }
         System.out.println("\n");
      }
   }
}

[Bernard Sigmund Gustav]

thank you very much