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  1. class Example<N extends Number, D extends Double> {
  2.     N nullAsNumber() { return null; }
  3.     D nullAsDouble() { return null; }
  4.  
  5.     public static void main(String[] args) {
  6.         System.out.println(System.getProperty("java.version"));
  7.         Example<Double, Double> e = new Example<>();
  8.  
  9.         try {
  10.             Double a = false ? 0.0 : e.nullAsNumber();
  11.             System.out.printf("a == %f%n", a);
  12.             Double b = false ? 0.0 : e.nullAsDouble();
  13.             System.out.printf("b == %f%n", b);
  14.  
  15.         } catch (NullPointerException x) {
  16.             System.out.println(x);
  17.         }
  18.     }
  19. }
Success #stdin #stdout 0.06s 27936KB
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stdin
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Standard input is empty
stdout
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1.8.0_112
a == null
java.lang.NullPointerException
https://ideone.com/rwsVRH
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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