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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. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		// your code goes here
  13.  
  14. 		String s = "                                    ";
  15. 		//Scanner scan = new Scanner(System.in);
  16.         //String s = scan.nextLine();
  17.         // Write your code here.
  18.         if (s.matches("[A-Za-z !,?._'@]+")){
  19.  
  20.         	System.out.println("["+s.trim().isEmpty()+"]");
  21.         	String ss = s.trim();
  22.         	char aaa = ss.charAt(0);
  23.         	System.out.println("{"+aaa+"}");
  24.  
  25.         String [] arr = s.trim().split("[ !,?._'@]+");
  26.         System.out.println(arr.length);
  27.  
  28.  
  29.         //s.charAt(8)
  30.         for (String retval: arr) {
  31.          System.out.println("["+retval+"]");
  32.         }
  33.     }
  34.        // scan.close();
  35. 	}
  36. }
Runtime error #stdin #stdout #stderr 0.06s 2841600KB
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stdin
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Standard input is empty
stdout
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[true]
stderr
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Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 0
	at java.lang.String.charAt(String.java:658)
	at Ideone.main(Main.java:22)
https://ideone.com/LCxknh
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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