Java assert disables execution of Map.remove() -

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Hi I was trying to remove the object from the map and I was testing it using this operation 

  // Map definition of private map & lt; String, map & lt; Long, Object & gt; & Gt; Group = new hashmop & lt; String, map & lt; Long, Object & gt; & Gt; (); // This does not remove items from the map Delete groups.get ("key"). Remove (ID)! = Null; // This map is removed from the groups. Get ("key"). Remove (id);   
 The above methods were tested on the same data. Why does Map.remove () do not work lightly?   
 
 
  emphasis  statement either based on the way you start VM Executed or not. You should put side effects in  not  parties.  
 From:  
 
 A claim is either enabled or disabled If the claim is enabled, the evaluation of the boolean expression is evaluated due to the evaluation of the claim and an error Is reported if the expression evaluates false. If the candidate is ineligible, evaluation of implantation has no effect.   
 and in the discussion section of the same section:  
 
 Because the claim may be disabled, the programs should not believe that the statements contained in the claims will be assessed. Thus, these Boolean expressions are usually free from side effects:

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