Null pointer with array

Question

Please help! I'm new to Java and have done the following:
Created an array to hold 100 records.
Created 5 records for the array (index 0, 1, 2, 3, 4)
Now I'm trying to use a for loop to have a write output of the array values and I'm getting a NULL pointer exception.
Any ideas???

Answer 1

When an array is initialized, all its values initially point to null (except for primitives, which point to their respective 0's).Try printing out the index of the value before you print the value - it should fail at index 5. If you want to end the for-loop at the first null entry, use
for(int index = 0 ; index < array.length && array[index] != null ; index++)
   array[index].doStuff();
}if you only want to print out non-null values, and skip all the rest, instead use
for(int index = 0 ; index < array.length; index++)
   if(array[index] != null )
      array[index].doStuff();
}