From ec6d2a8ebed45a14c4d2af5d19660bac747f6a34 Mon Sep 17 00:00:00 2001
From: Eric Riese <eric.riese@gmail.com>
Date: Fri, 7 Sep 2018 22:29:51 -0400
Subject: [PATCH] execute around lambda

---
 .../java/com/iluwatar/execute/around/App.java    | 16 ++++++----------
 .../execute/around/FileWriterAction.java         |  1 +
 2 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/execute-around/src/main/java/com/iluwatar/execute/around/App.java b/execute-around/src/main/java/com/iluwatar/execute/around/App.java
index 11775462a..679ddabdc 100644
--- a/execute-around/src/main/java/com/iluwatar/execute/around/App.java
+++ b/execute-around/src/main/java/com/iluwatar/execute/around/App.java
@@ -22,7 +22,6 @@
  */
 package com.iluwatar.execute.around;
 
-import java.io.FileWriter;
 import java.io.IOException;
 
 /**
@@ -42,14 +41,11 @@ public class App {
    */
   public static void main(String[] args) throws IOException {
 
-    new SimpleFileWriter("testfile.txt", new FileWriterAction() {
-
-      @Override
-      public void writeFile(FileWriter writer) throws IOException {
-        writer.write("Hello");
-        writer.append(" ");
-        writer.append("there!");
-      }
-    });
+    FileWriterAction writeHello = writer -> {
+      writer.write("Hello");
+      writer.append(" ");
+      writer.append("there!");
+    };
+    new SimpleFileWriter("testfile.txt", writeHello);
   }
 }
diff --git a/execute-around/src/main/java/com/iluwatar/execute/around/FileWriterAction.java b/execute-around/src/main/java/com/iluwatar/execute/around/FileWriterAction.java
index 83670c361..dfa6b8fa5 100644
--- a/execute-around/src/main/java/com/iluwatar/execute/around/FileWriterAction.java
+++ b/execute-around/src/main/java/com/iluwatar/execute/around/FileWriterAction.java
@@ -30,6 +30,7 @@ import java.io.IOException;
  * Interface for specifying what to do with the file resource.
  *
  */
+@FunctionalInterface
 public interface FileWriterAction {
 
   void writeFile(FileWriter writer) throws IOException;