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  1. import java.util.*;
  2. import java.util.stream.*;
  3.  
  4. class Ideone {
  5. 	public static void main (String[] args) {
  6.         String in = "useful1.useless1,useful2.useless2,useful3.useless3,";
  7.     String[] strArray = in.split(",");
  8. 		char[][] usefulChars = Arrays.stream(strArray)
  9.   .map(s -> s.replaceAll("\\..*", ""))
  10.   .map(String::toCharArray)
  11.   .toArray(char[][]::new);
  12.    System.out.println(Arrays.deepToString(usefulChars));
  13. 	}
  14. }
Success #stdin #stdout 0.08s 50888KB
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stdin
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Standard input is empty
stdout
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[[u, s, e, f, u, l, 1], [u, s, e, f, u, l, 2], [u, s, e, f, u, l, 3]]
https://ideone.com/LhC9ZT
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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