Editing Generator (computer programming) (section)

===Java===
Java has had a standard interface for implementing iterators since its early days, and since Java 5, the "foreach" construction makes it easy to loop over objects that provide the <code>java.lang.Iterable</code> interface. (The [[Java collections framework]] and other collections frameworks, typically provide iterators for all collections.)

<syntaxhighlight lang="java">

record Pair(int a, int b) {};

Iterable<Integer> myIterable = Stream.iterate(new Pair(1, 1), p -> new Pair(p.b, p.a + p.b))
        .limit(10)
        .map(p -> p.a)::iterator;

myIterable.forEach(System.out::println);

</syntaxhighlight>

Or get an Iterator from the '''Java 8''' super-interface BaseStream of Stream interface.
<syntaxhighlight lang="java">

record Pair(int a, int b) {};

// Save the iterator of a stream that generates fib sequence
Iterator<Integer> myGenerator = Stream
        // Generates Fib sequence
        .iterate(new Pair(1, 1), p -> new Pair(p.b, p.a + p.b))
        .map(p -> p.a).iterator();

// Print the first 5 elements
for (int i = 0; i < 5; i++) {
    System.out.println(myGenerator.next());
}

System.out.println("done with first iteration");

// Print the next 5 elements
for (int i = 0; i < 5; i++) {
    System.out.println(myGenerator.next());
}
</syntaxhighlight>

Output:
<syntaxhighlight lang="console">
1
1
2
3
5
done with first iteration
8
13
21
34
55
</syntaxhighlight>