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  1. public final class Main {
  2.  
  3.     public static void main (String[] args) {
  4.         var yellow = Color.findByName("YELLOW");
  5.         var rgb = yellow.getRgb();
  6. 		// Needs to check whether or not 'rgb' is -1 after all.
  7.     }
  8.  
  9.     public interface Color {
  10.  
  11. 	    /** Represents the invalid color. */
  12.         static final Color INVALID = () -> -1;
  13.  
  14.         /**
  15. 	        Returns the Color instance that matches with the specified name.
  16.  
  17.             @param name
  18.                 ...
  19.             @return
  20. 	            {@code null} if nothing matches with {@code name}.
  21. 	            Otherwise, the instance that matches.
  22.         */
  23.         static Color findByName(String name) {
  24.             return INVALID;
  25.         }
  26.  
  27.         /**
  28. 	        Returns the 24-bit integer value representing RGB.
  29.  
  30.             @return
  31.             	-1 if this object is invalid.
  32.             	Otherwise, the 24-bit integer value representing RGB.
  33.         */
  34.         int getRgb();
  35.     }
  36. }
  37.  
Success #stdin #stdout 0.07s 33376KB
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https://ideone.com/yA1wwh
The Insanity Beyond Null: Null object pattern #5
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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