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For Java developers... you can use Optional<Boolean> to store the elusive four possible booleans.
by shagie 8mo ago
For Java developers... you can use Optional<Boolean> to store the elusive four possible booleans.
- nitnelave 8mo ago5, no? Null, Optional::empty, Optional(null), Optional(true), Optional(false)
- shagie 8mo agopublic static void main (String[] args) { Optional<Boolean> n = Optional.ofNullable(null); Optional<Boolean> e = Optional.empty(); System.out.println(n.equals(e)); } true https://ideone.com/EGRdi5 https://ideone.com/EGRdi5 A null in an Optional is empty. So you've got: Optional<Boolean> n = null; Optional<Boolean> e = Optional.empty(); Optional<Boolean> t = Optional.of(Boolean.TRUE); Optional<Boolean> f = Optional.of(Boolean.FALSE);
- nitnelave 8mo agoI guess I was missing the NPE: https://ideone.com/rp4Nvv https://ideone.com/rp4Nvv Optional.of(null) throws an NPE