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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. import java.util.stream.* ;
  8.  
  9. /* Name of the class has to be "Main" only if the class is public. */
  10. class Ideone
  11. {
  12. 	public static void main (String[] args) throws java.lang.Exception
  13. 	{
  14. 		// One-liner
  15. 		System.out.println(
  16. 			Arrays.toString(
  17. 				"23g32./'ef3".codePoints().filter( Character::isDigit ).map( Character::getNumericValue ).toArray()
  18. 			)
  19. 		);
  20.  
  21.  
  22. 		// Array
  23. 		int[] digitsArray =
  24.         "23g32./'ef3"
  25.                 .codePoints()
  26.                 .filter(
  27.                         Character::isDigit
  28.                 )
  29.                 .map(
  30.                         Character::getNumericValue
  31.                 )
  32.                 .toArray();
  33.  
  34.         System.out.println( "digitsArray = " + Arrays.toString( digitsArray ) );
  35.  
  36.         // List
  37. 		List < Integer > digits =
  38. 		        "23g32./'ef3"
  39. 		                .codePoints()
  40. 		                .filter(
  41. 		                        codePoint -> Character.isDigit( codePoint )
  42. 		                )
  43. 		                .map(
  44. 		                        codePoint -> Character.getNumericValue( codePoint )
  45. 		                )
  46. 		                .boxed()
  47. 		                .collect( Collectors.toList() )   // Or, in Java 16+, simply `.toList()`
  48.         ;
  49.  
  50. 		System.out.println( "digits = " + digits );
  51. 	}
  52. }
Success #stdin #stdout 0.13s 53316KB
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stdin
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Standard input is empty
stdout
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[2, 3, 3, 2, 3]
digitsArray = [2, 3, 3, 2, 3]
digits = [2, 3, 3, 2, 3]
https://ideone.com/6vmWmW
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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