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  1. class Ideone
  2. {
  3.     final static Ideone BUGOR = new Ideone();
  4.     final String s="";
  5.     final static String lalka=null;
  6.  
  7.  
  8.     public String concat() {
  9.         return lalka.trim()+s;
  10.     }
  11.  
  12.     public static void main(String[] args) {
  13.         System.out.println(BUGOR.concat());
  14.     } 
  15. }
Runtime error #stdin #stdout #stderr 0.09s 47072KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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Exception in thread "main" java.lang.NullPointerException
	at Ideone.concat(Main.java:9)
	at Ideone.main(Main.java:13)
https://ideone.com/h9Akn1
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
secret

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