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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone {
  6. 	public static void main (String[] args) {
  7. 		Optional<Boolean> n = Optional.of(null);
  8. 		Optional<Boolean> e = Optional.empty();
  9. 		System.out.println(n.equals(e));
  10. 	}
  11. }
Runtime error #stdin #stdout #stderr 0.11s 54696KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
stderr 
Exception in thread "main" java.lang.NullPointerException
	at java.base/java.util.Objects.requireNonNull(Objects.java:221)
	at java.base/java.util.Optional.<init>(Optional.java:107)
	at java.base/java.util.Optional.of(Optional.java:120)
	at Ideone.main(Main.java:7)
https://ideone.com/rp4Nvv
language:
Java (HotSpot 12)
created:
4 hours ago
visibility:
secret

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