What's the difference b/w next() and hasNext()?

[jamesgo]

if the query has only one match, will hasNext() return true?

[Brad Tilton]

hasNext() either returns true or false while next() will actually iterate to the record.

So I could do:

gr.query();

if (gr.next()) {

   gr.field = 'value';

   gr.update();

}

but this won't update anything:

gr.query();

if (gr.hasNext()) {

   gr.field = 'value';

   gr.update();

}

So if there are one or more records contained in your gr set, hasNext() will return true.

[jamesgo]

Hi Brad, in 2nd scenario, gr doesn't iterate to the actual record? if there is only one match, what is contained in the gr when using hasNext?

[rmaroti]

When I was try with above code in nest() if I got the updated record but not updated in case of hasNext().

[kumaril1]

hasNext() : hasNext() method returns true if iterator have more elements.

next() : next() method returns the next element and also moves to the next element.