android - java.lang.Void vs void vs Null -

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What is the difference between

zero , zero , and I Rather than null ?

I am asking this because I am looking at the sample Android code where they used zero but eclipse errors (this can not be solved in zero in a variable ).

My code that breaks 

  public class MyAsyncTask asyncTask and lt; Zero, zero, boolean & gt; .}   
 I use it like this  
  MyAsyncTask myAsyncTask = New MyAsyncTask (); MyAsyncTask.execute ((zero), blank); // It breaks "zero can not be solved in a variable"    
 
 < P> You have an extra comma in your code  
  myAsyncTask.execute (zero, zero); // ^ Additional comma right here   
 In addition, there is no need to insert  null  to  zero  because (1) < Code> zero  does not have any examples and thus there is no  zero  object, and (2) casting  null  anything is useless because of any The zero valid value for the object data type is  
 The code should rarely be:  
  myAsyncTask.execute (null);

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