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  1.  
  2. /* Name of the class has to be "Main" only if the class is public. */
  3. class Ideone
  4. {
  5. 	public static void main (String[] args) throws java.lang.Exception
  6. 	{
  7. 		String x = "1234";
  8. 		System.out.println(Character.isDigit(x.charAt(0)));
  9. 		x = "a123";
  10. 		System.out.println(Character.isDigit(x.charAt(0)));
  11. 	}
  12. }
Success #stdin #stdout 0.1s 320512KB
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stdin
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Standard input is empty
stdout
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true
false
https://ideone.com/w6c7Vx
language:
Java (12.0.1)
created:
8 years ago
visibility:
secret

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