carlosmaniero

import java.util.Arrays;

public class StreamSum {
    public static void main(String args[]) {
        int[] array = new int[]{1, 2, 3, 4, 5};

        int sum = Arrays.stream(array).sum();
        System.out.println(sum);
    }
}

carlosmaniero

import java.util.Arrays;

public class StreamForEach {
    public static void main(String args[]) {
        int[] array = new int[]{1, 2, 3, 4, 5};

        Arrays.stream(array)
                .forEach(item -> System.out.println("item: " + item));
    }
}

carlosmaniero

public class Sum {
    public static void main(String args[]) {
        int[] array = new int[]{1, 2, 3, 4, 5};
        int sum = 0;

        for (int item: array) {
            sum += item;
        }

        System.out.println(sum);

carlosmaniero

interface TouchCallback {
    public void apply(int times);
}

class TouchMe {
    private int times = 0;
    private TouchCallback onTouch;

    TouchMe(TouchCallback onTouch) {
        this.onTouch = onTouch;

carlosmaniero

public class LambdaExpression {
    public static void main(String args[]) {
        TouchMe touchMe = new TouchMe(times -> System.out.println(times));

        touchMe.touch();    // 1
        touchMe.touch();    // 2
        touchMe.touch();    // 3
        touchMe.touch();    // 4
        touchMe.touch();    // 5
    }

carlosmaniero

public class LambdaExpression {
    public static void main(String args[]) {
        TouchMe touchMe = new TouchMe(System.out::println);

        touchMe.touch();    // 1
        touchMe.touch();    // 2
        touchMe.touch();    // 3
        touchMe.touch();    // 4
        touchMe.touch();    // 5
    }

carlosmaniero

import java.util.stream.Stream;

public class StreamForEach {
    public static void main(String args[]) {
        System.out.println("Fruit List:");

        Stream.of("Banana", "Apple", "Kiwi")
                .forEach(System.out::println);
    }
}

carlosmaniero

import java.util.HashMap;
import java.util.Map;

public class StreamMap {
    public static void main(String args[]) {
        Map<String, Integer> fruits = new HashMap<>();
        fruits.put("Banana", 7);
        fruits.put("Apple", 2);
        fruits.put("Kiwi", 1);

carlosmaniero

import java.util.stream.Stream;

public class ReduceSum {
    public static void main(String args[]) {
        int sum = Stream.of(1, 2, 3, 4, 5)
                .reduce(0, (acc, item) -> acc + item);

        System.out.println(sum);
    }
}

carlosmaniero

import java.util.HashMap;
import java.util.Map;

class Fair {
    private final int quantity;

    Fair(int quantity) {
        this.quantity = quantity;
    }