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  1. class Example {
  2.     public static void main(String[] args) {
  3.         System.out.println(getHex(255, 255, 255)); // #fff
  4.         System.out.println(getHex(255, 240, 255)); // #fff0ff
  5.     }
  6.  
  7.     static String getHex(int r, int g, int b) {
  8.         return String.format("#%02x%02x%02x", r, g, b).replaceAll("^#([a-fA-F])\\1([a-fA-F])\\2([a-fA-F])\\3$", "#$1$2$3");
  9.     }
  10. }
Success #stdin #stdout 0.04s 2184192KB
comments (?)
stdin 
Standard input is empty
stdout 
#fff
#fff0ff
https://ideone.com/CieKl0
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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