package Java8;

import java.util.Arrays;

import java.util.List;

public class Example2 {

public static void main(String[] args) {

List<Integer> values = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9);

doubleTheValueAndSumJava7(values);

doubleTheValueAndSumJava8(values);

}

// double and sum

// 2+4+6+8+10..... = sum(all)

private static void doubleTheValueAndSumJava7(List<Integer> values) {

System.out.println("Double and sum using java 7");

int sum = 0;

for (Integer value : values) {

sum += value * 2;

}

System.out.println(sum);

}

// have very useful feature stream

private static void doubleTheValueAndSumJava8(List<Integer> values) {

System.out.println("Double and sum using java 8");

System.out.println(values.stream()

.map(e -> e * 2)

.reduce(0, (c, e) -> c + e));

}

}