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  1. class OnlyDigits
  2. {
  3. 	public static void main (String[] args) throws java.lang.Exception
  4. 	{
  5. 		String[] corpus = new String[]{
  6. 			"123",
  7. 			"",
  8. 			"abc123def",
  9. 			"abc",
  10. 			"123.456",
  11. 			"123 456",
  12. 		};
  13. 		for(String s:corpus) {
  14. 			boolean b = s.matches("[0-9]*");
  15. 			System.out.println( s + " => " + b);
  16. 		}
  17. 	}
  18. }
Success #stdin #stdout 0.1s 320512KB
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stdin
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Standard input is empty
stdout
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123 => true
 => true
abc123def => false
abc => false
123.456 => false
123 456 => false
https://ideone.com/xtfb5B
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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