Generator (computer programming): Difference between revisions

Revision as of 05:52, 11 August 2021

Revision as of 19:40, 5 September 2021

Line 404:

Also an infinite Fibonacci sequence could also be written using '''Java 8''' Stream interface:

<syntaxhighlight lang="java">

public Iterable<Integer> fibonacci(intmyIterable = limit){Stream

IntStream.generate(new IntSupplier() {

int a = 1, b// =Generates 2;Fib sequence

.iterate(new Integer[]{ 1, 1 }, x -> new Integer[] { x[1], x[0] + x[1] })

.map(x -> x[0])::iterator;

public int getAsInt() {

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

int temp = a;

a = b;

b = a + temp;

return temp;

}

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

</syntaxhighlight>

Or get an Iterator from the '''Java 8''' super-interface BaseStream of Stream interface.

<syntaxhighlight lang="java">

// Save the iterator of a stream that generates fib sequence

public Iterable<Integer> fibonacci(int limit){

Iterator<Integer> myGenerator = Stream

return IntStream.generate(new IntSupplier() {

int// aGenerates =Fib 1, b = 2;sequence

.iterate(new Integer[]{ 1, 1 }, x -> new Integer[] { x[1], x[0] + x[1] })

.map(x -> x[0]).iterator();

// Print the first 5 elements

public int getAsInt() {

for (int i = 0; i < 5; i++) int temp = a;{

System.out.println(fmyGenerator.next());

a = b;

b = a + temp;

return temp;

}

}).limit(limit).boxed()::iterator;

}

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

// this could then be used as...

for (int f: fibonacci(10)) {

// Print the next 5 elements

System.out.println(f);

for (int f:i fibonacci(10)= 0; i < 5; i++) {

System.out.println(myGenerator.next());

}

/* Output:

1

1

2

3

5

done with first iteration

8

13

21

34

55 */

</syntaxhighlight>