Convert int array to IntStream

import java.util.Arrays;

import java.util.stream.IntStream;

public class Main

            public static void main(String[] args)

             int[] numbers = {2, 3, 5, 7, 11, 13};

    IntStream intStream = Arrays.stream(numbers);

    intStream = intStream.limit(3);

    System.out.println(intStream.sum());

Generate constant values from IntStream

import java.util.stream.IntStream;

public class Main

public static void main(String[] args)

                       IntStream.generate(() -> 1)

             .limit(5)

             .forEach(System.out::println);

import java.util.Arrays;

import java.util.List;

public class Main

  public static void main(String[] args) throws Exception

    List menu =

        Arrays.asList( new Dish("pork", false, 800, Dish.Type.Meat),

                       new Dish("beef", false, 700, Dish.Type.Meat),

                       new Dish("chicken", false, 400, Dish.Type.Meat),

                       new Dish("rice", true, 350, Dish.Type.Other),

                       new Dish("pizza", true, 550, Dish.Type.Other),

                       new Dish("prawns", false, 400, Dish.Type.Fish),

                       new Dish("salmon", false, 450, Dish.Type.Fish));

    List<Integer> numbers = Arrays.asList(3,4,5,1,2);

               Arrays.stream(numbers.toArray()).forEach(System.out::println);

    int calories = menu.stream()

                       .mapToInt(Dish::getCalories)

                       .sum();

    System.out.println("Number of calories:" + calories);

          class Dish

  private final String name;

  private final boolean vegetarian;

  private final int calories;

  private final Type type;

          public Dish(String name, boolean vegetarian, int calories, Type type)

      this.name = name;

      this.vegetarian = vegetarian;

      this.calories = calories;

      this.type = type;

           public String getName()

      return name;

           public boolean isVegetarian()

      return vegetarian;

public int getCalories()

      return calories;

           public Type getType()

      return type;

           public enum Type { Meat, Fish, Other }

           public String toString()

      return name;

import java.util.function.IntConsumer;

public class Main

  public static void start(IntConsumer cons, int d)

    cons.accept(d);

  public static void main(String[] args)

    start(e -> System.out.print("Release year: " + e), 2013);

public class Main

public static void main(String[] args)

             String s = "R2D2C3P0";

    int result = s.chars()

            .filter(Character::isDigit)

            .map(ch -> Character.valueOf((char) ch)).sum();

    System.out.println(result);