add IntStream samples

Author: winterbe

src/com/winterbe/java8/Streams4.java

@@ -0,0 +1,37 @@
+package com.winterbe.java8;
+
+import java.util.OptionalInt;
+import java.util.stream.IntStream;
+
+/**
+ * @author Benjamin Winterberg
+ */
+public class Streams4 {
+
+ public static void main(String[] args) {
+ for (int i = 0; i < 10; i++) {
+ if (i % 2 == 1) {
+ System.out.println(i);
+ }
+ }
+
+ IntStream.range(0, 10)
+ .forEach(i -> {
+ if (i % 2 == 1) System.out.println(i);
+ });
+
+ IntStream.range(0, 10)
+ .filter(i -> i % 2 == 1)
+ .forEach(System.out::println);
+
+ OptionalInt reduced1 =
+ IntStream.range(0, 10)
+ .reduce((a, b) -> a + b);
+ System.out.println(reduced1.getAsInt());
+
+ int reduced2 =
+ IntStream.range(0, 10)
+ .reduce(7, (a, b) -> a + b);
+ System.out.println(reduced2);
+ }
+}