fork download
copy 
  1.  
  2. import java.util.*;
  3. import java.lang.*;
  4. import java.io.*;
  5.  
  6. class A
  7. {
  8. 	public A()
  9. 	{
  10. 		System.out.println(getVal().toString());
  11. 	}
  12. 	Integer getVal() { return 12;}
  13.  
  14. }
  15. class B extends A
  16. {
  17. 	final Integer i;	
  18. 	public B()
  19. 	{
  20. 	    super();
  21. 	    i=42;
  22. 	}
  23. 	Integer getVal(){ return i;}
  24.  
  25. }
  26. class Ideone
  27. {
  28. 	public static void main (String[] args)
  29. 	{
  30. 		new B();
  31. 	}
  32. }
Runtime error #stdin #stdout #stderr 0.08s 46800KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Standard output is empty
stderr
copy 
Exception in thread "main" java.lang.NullPointerException
	at A.<init>(Main.java:10)
	at B.<init>(Main.java:20)
	at Ideone.main(Main.java:30)
https://ideone.com/l9dxHL
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!