Converting input String to int array with Variable length in java -

here snippet of code. want of user number variable length , convert int array. example: input: 352040 , output:{3,5,2,0,4,0}

  scanner in = new scanner(system.in);      system.out.println(" enter size number: ");          int length = in.nextint();      system.out.println(" enter number: ");          int number = in.nextint();           int[] intarray = null;          string str = integer.tostring(number);           ( int =0; < length ;i++)            intarray[i] = integer.parseint(string.valueof(str.charat(i)));              system.out.println(arrays.tostring(intarray)); 

this comes error(exception in thread "main" java.lang.nullpointerexception) , cant understand why.

thanks help.

you need create array first.

     int[] intarray = new int[length];  // create array      string str = integer.tostring(number);       ( int =0; < length -1;i++)         intarray[i] = integer.parseint(string.valueof(str.charat(i)));