NullPointerException for my for loop? java - 


 public static double[] returnarray()  {    (int a=0; a<31; a++) {      double = double.valueof(days[a]);       dataarray[a]=i;    }        return(dataarray);     }

days[] array of string , static double[] dataarray declared

and says got nullpointerexception @ double = double.valueof(days[a]);? please help,

check there values in days[a] before 

double = double.valueof(days[a]);

my suspicion days days[30] might have no value inside sometimes.


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