Java 8: IntStream

//Java8 IntStream Feature
//PrimitiveIterator is just introduced in java8
import java.util.PrimitiveIterator.OfInt;
//IntSupplier is just introduced in java8 and it is a functional interface
import java.util.function.IntSupplier;
import java.util.stream.IntStream;

public class IntStreamExample
{
    public static void main(String args[])
    {
        System.out.println("-------of() Example------");
        // of just takes the arbitrary numbers of int
        IntStream ofEx = IntStream.of(1, 2, 3);
        ofEx.forEach(x -> System.out.println(x));// It prints 1 2 3
     
        System.out.println("-------range() Example------");
        // range just prints the number within the range includes the starting number and excludes the ending number
        IntStream stream = IntStream.range(1, 3); // It prints 1 2
        // OfInt as a more performance replacement for Iterator<Integer>
        OfInt intList = stream.iterator();
        while (intList.hasNext())
        {
            System.out.println(intList.nextInt());
        }
     
        System.out.println("-------rangeClosed() Example------");
        // rangeClosed just prints the number within the range includes both starting and ending number
        IntStream.rangeClosed(1, 3).forEach(System.out::println); // It prints 1 2 3
        // IntStream.
     
        System.out.println("-------iterator() Example------");
        // iterator just iterate elements based on condition(x->x+1) and limit(Just count)
        IntStream.iterate(1, x -> x + 1).limit(5).forEach(System.out::println);// It prints 1 2 3 4 5
     
        System.out.println("-------generator() Example------");
        // generator simply takes an IntSupplier that will independently calculate the next int.
        // IntSupplier represents a supplier of int-valued results
        IntSupplier fib = new IntSupplier()
        {
            private int previous = 0;
         
            private int current = 1;
         
            public int getAsInt()
            {
                int nextValue = this.previous + this.current;
                this.previous = this.current;
                this.current = nextValue;
                return this.previous;
            }
        };
        IntStream.generate(fib).limit(10).forEach(System.out::println); // It prints fibonacci series
     
    }
}