From 4262461c3ce6ef747a1c4d1083bbfeed97900ef9 Mon Sep 17 00:00:00 2001
From: Julio Biason <julio.biason@deliverit.com.br>
Date: Wed, 15 May 2019 15:23:54 -0300
Subject: [PATCH] Trying some function composition, but it is not working

---
 .gitignore |  2 ++
 Compo.java | 45 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Compo.java

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..55175ac
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.class
+*.sw?
diff --git a/Compo.java b/Compo.java
new file mode 100644
index 0000000..027070a
--- /dev/null
+++ b/Compo.java
@@ -0,0 +1,45 @@
+/*
+ * This is me testing function composition in Java.
+ *
+ */
+import java.util.List;
+import java.util.stream.Stream;
+import java.util.stream.Collectors;
+import java.util.function.Function;
+import java.util.function.Consumer;
+
+public class Compo {
+	public static void main(String[] argv) {
+		System.out.println("Starting up...");
+
+		Doubler doubler = new Doubler();
+		PlusTwo plusTwo = new PlusTwo();
+		Printer printer = new Printer();
+
+		List<Long> result = Stream.of(2L, 4L, 5L, 7L)
+			.peek(doubler.andThen(plusTwo).andThen(printer))
+			.collect(Collectors.toList());
+		System.out.println("Result: " + result);
+	}
+
+	private static class Doubler implements Function<Long, Long> {
+		@Override
+		public Long apply(Long input) {
+			return input * 2;
+		}
+	}
+
+	private static class PlusTwo implements Function<Long, Long> {
+		@Override
+		public Long apply(Long input) {
+			return input + 2L;
+		}
+	}
+
+	private static class Printer implements Consumer<Long> {
+		@Override
+		public void accept(Long input) {
+			System.out.println("Consumer: " + input);
+		}
+	}
+}