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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		Optional<Integer> myOptional = Optional.of(0);
  13.  
  14. 		Integer result;
  15. 		if (myOptional.isPresent()) {
  16.     		result = myOptional.get() * 2;
  17. 		} else {
  18.     		result = 0;
  19. 		}
  20. 		System.out.println(result);
  21.  
  22. 		Integer result2;
  23. 		if (myOptional.isPresent()) {
  24.     		result2 = myOptional.get() * 2;
  25. 		}
  26. 		System.out.println(result2);  // Compiler error.
  27.  
  28. 		Integer result3;
  29. 		if (!myOptional.isPresent()) {
  30.     		result3 = 0;
  31. 		}
  32. 		System.out.println(result3);  // Compiler error.
  33. 	}
  34. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:26: error: variable result2 might not have been initialized
		System.out.println(result2);  // Compiler error.
		                   ^
Main.java:32: error: variable result3 might not have been initialized
		System.out.println(result3);  // Compiler error.
		                   ^
2 errors
stdout
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Standard output is empty
https://ideone.com/O0MkYJ
language:
Java (12.0.1)
created:
8 years ago
visibility:
public

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