How do you split a string into a 2d array and access each grouping based on row?
17,419
Solution 1
public static String [][] to2dim (String source, String outerdelim, String innerdelim) {
String [][] result = new String [source.replaceAll ("[^" + outerdelim + "]", "").length () + 1][];
int count = 0;
for (String line : source.split ("[" + outerdelim + "]"))
{
result [count++] = line.split (innerdelim);
}
return result;
}
public static void show (String [][] arr)
{
for (String [] ar : arr) {
for (String a: ar)
System.out.print (" " + a);
System.out.println ();
}
}
public static void main (String args[])
{
show (to2dim ("a b c \n d e f \n g h i", "\n", " "));
}
newbie friendly:
public static String [][] to2dim (String source, String outerdelim, String innerdelim) {
// outerdelim may be a group of characters
String [] sOuter = source.split ("[" + outerdelim + "]");
int size = sOuter.length;
// one dimension of the array has to be known on declaration:
String [][] result = new String [size][];
int count = 0;
for (String line : sOuter)
{
result [count] = line.split (innerdelim);
++count;
}
return result;
}
Solution 2
here's a simple example
String example = "a b c \n d e f \n g h i";
String[] rows = example.split("\n");
for (int i = 0; i < rows.length; i++) {
String[] columns = rows[i].split(" ");
for (int j = 0; j < columns.length; j++) {
//do something
}
}
Author by
user1299661
Updated on June 26, 2022Comments
-
user1299661 almost 2 years
I would like to know how I can separate a string and assign it to a specific row of a 2d array automatically in the same fashion that the single dimensional array is instantiated below:
public class TestArray { public static void main (String [] args) { String file1description= "We went to the mall yesterday."; String[] file1tags; String delimiter= " "; file1tags = file1description.split (delimiter); for (int i = 0; i < file1tags.length; i++) { System.out.println (file1tags[i]); } } }
If there are any simpler ways please share. As you can tell I am quite a novice, but I am willing to learn. In this example, each word is separated by the delimiter and stored automatically into the "file1tags" array. How can I do this with a 2d array, so that I can call multiple arrays that have this same function? Thanks in advance!