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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. import java.util.regex.Pattern;
  7.  
  8.  
  9. /* Name of the class has to be "Main" only if the class is public. */
  10. class Ideone
  11. {
  12.     private static final Pattern BITS = Pattern.compile("^(?=(1*01*0)*1*$)(?=(0*10*1)*0*$).*$");
  13.  
  14.     public static final boolean evenBitCounts(String value) {
  15.         return BITS.matcher(value).matches();
  16.     }
  17.  
  18.  
  19.     public static void main(String[] args) {
  20.         String[] inputs = {
  21.                 "01010101",
  22.                 "",
  23.                 "11",
  24.                 "00",
  25.                 "01",
  26.                 "111",
  27.                 "11110",
  28.                 "1111",
  29.                 "0000",
  30.                 "0 11"
  31.  
  32.         };
  33.         for (String t : inputs) {
  34.             System.out.printf("Test: %s -> %s\n", t, evenBitCounts(t));
  35.         }
  36.     }
  37. }
Success #stdin #stdout 0.11s 320576KB
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stdin
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Standard input is empty
stdout
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Test: 01010101 -> true
Test:  -> true
Test: 11 -> true
Test: 00 -> true
Test: 01 -> false
Test: 111 -> false
Test: 11110 -> false
Test: 1111 -> true
Test: 0000 -> true
Test: 0 11 -> false
https://ideone.com/fsureV
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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