add IntStream samples

winterbe · winterbe · commit 98ac2d02524a · 2014-05-09T23:30:13.000+02:00
diff --git a/src/com/winterbe/java8/Streams4.java b/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);
+    }
+}
