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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. 		String input = "hello how are you";
  13.     List<String> pairs = new ArrayList<>();
  14.     for (int i = 0; i < input.length(); ++i) {
  15.       // Skip over non-alphabetic characters.
  16.       if (!Character.isAlphabetic(input.charAt(i))) continue;
  17.  
  18.       // Look for the next alphabetic character:
  19.       for (int j = i + 1; j < input.length(); ++j) {
  20.         // Skip over non-alphabetic characters.
  21.         if (!Character.isAlphabetic(input.charAt(j))) continue;      
  22.  
  23.         // You've now found a pair.
  24.         pairs.add("" + input.charAt(i) + input.charAt(j));
  25.         break;
  26.       }
  27.     }
  28.     System.out.println(pairs);
  29. 	}
  30. }
Success #stdin #stdout 0.14s 35868KB
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stdin
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Standard input is empty
stdout
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[he, el, ll, lo, oh, ho, ow, wa, ar, re, ey, yo, ou]
https://ideone.com/dKtAN6
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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