From 27b815378c1c192cdfc176cbded2377d45367738 Mon Sep 17 00:00:00 2001
From: Cheng <cheng@strikingly.com>
Date: Mon, 25 Dec 2017 15:40:39 +0800
Subject: [PATCH] evolve(demo1):dependency injection - constructor injection

---
 spring-demo-1/src/applicationContext.xml         |  8 ++++++++
 .../com/luv2code/springdemo/BaseballCoach.java   | 13 +++++++++++++
 .../src/com/luv2code/springdemo/Coach.java       |  1 +
 .../com/luv2code/springdemo/FortuneService.java  |  6 ++++++
 .../luv2code/springdemo/HappyFortuneService.java |  9 +++++++++
 .../com/luv2code/springdemo/HelloSpringApp.java  |  1 +
 .../src/com/luv2code/springdemo/TrackCoach.java  | 16 ++++++++++++++++
 7 files changed, 54 insertions(+)
 create mode 100644 spring-demo-1/src/com/luv2code/springdemo/FortuneService.java
 create mode 100644 spring-demo-1/src/com/luv2code/springdemo/HappyFortuneService.java

diff --git a/spring-demo-1/src/applicationContext.xml b/spring-demo-1/src/applicationContext.xml
index 07440aa..d8333c6 100644
--- a/spring-demo-1/src/applicationContext.xml
+++ b/spring-demo-1/src/applicationContext.xml
@@ -8,8 +8,16 @@
     http://www.springframework.org/schema/context/spring-context.xsd">
 
     <!-- Define your beans here -->
+
+    <bean id="myFortuneService"
+      class="com.luv2code.springdemo.HappyFortuneService"></bean>
+
     <bean id="myCoach"
       class="com.luv2code.springdemo.TrackCoach">
+
+    		<!-- set up constrcutor injection -->
+    		<constructor-arg ref="myFortuneService"></constructor-arg>
+
     </bean>
 
 </beans>
diff --git a/spring-demo-1/src/com/luv2code/springdemo/BaseballCoach.java b/spring-demo-1/src/com/luv2code/springdemo/BaseballCoach.java
index 473e4d4..6aa6dcc 100644
--- a/spring-demo-1/src/com/luv2code/springdemo/BaseballCoach.java
+++ b/spring-demo-1/src/com/luv2code/springdemo/BaseballCoach.java
@@ -3,9 +3,22 @@
 
 public class BaseballCoach implements Coach {
 
+	// define a private field for dependency
+	private FortuneService fortuneService;
+
+	// define a constructor for dependency injection
+	public BaseballCoach(FortuneService theFortuneService) {
+		fortuneService = theFortuneService;
+	}
+
 	@Override
 	public String getDailyWorkout() {
 		return "Spend 30 minutes on batting practice";
 	}
 
+	@Override
+	public String getDailyFortune() {
+		return fortuneService.getFortune();
+	}
+
 }
diff --git a/spring-demo-1/src/com/luv2code/springdemo/Coach.java b/spring-demo-1/src/com/luv2code/springdemo/Coach.java
index 668c795..07bff05 100644
--- a/spring-demo-1/src/com/luv2code/springdemo/Coach.java
+++ b/spring-demo-1/src/com/luv2code/springdemo/Coach.java
@@ -4,4 +4,5 @@ public interface Coach {
 
 	public String getDailyWorkout();
 
+	public String getDailyFortune();
 }
diff --git a/spring-demo-1/src/com/luv2code/springdemo/FortuneService.java b/spring-demo-1/src/com/luv2code/springdemo/FortuneService.java
new file mode 100644
index 0000000..0dee0fb
--- /dev/null
+++ b/spring-demo-1/src/com/luv2code/springdemo/FortuneService.java
@@ -0,0 +1,6 @@
+package com.luv2code.springdemo;
+
+public interface FortuneService {
+
+	public String getFortune();
+}
diff --git a/spring-demo-1/src/com/luv2code/springdemo/HappyFortuneService.java b/spring-demo-1/src/com/luv2code/springdemo/HappyFortuneService.java
new file mode 100644
index 0000000..67227ae
--- /dev/null
+++ b/spring-demo-1/src/com/luv2code/springdemo/HappyFortuneService.java
@@ -0,0 +1,9 @@
+package com.luv2code.springdemo;
+
+public class HappyFortuneService implements FortuneService {
+
+	@Override
+	public String getFortune() {
+		return "This a your lucky day";
+	}
+}
diff --git a/spring-demo-1/src/com/luv2code/springdemo/HelloSpringApp.java b/spring-demo-1/src/com/luv2code/springdemo/HelloSpringApp.java
index 8022961..987b2e9 100644
--- a/spring-demo-1/src/com/luv2code/springdemo/HelloSpringApp.java
+++ b/spring-demo-1/src/com/luv2code/springdemo/HelloSpringApp.java
@@ -14,6 +14,7 @@ public static void main(String[] args) {
 
 		// call methods on bean
 		System.out.println(theCoach.getDailyWorkout());
+		System.out.println(theCoach.getDailyFortune());
 
 		// close the context
 		context.close();
diff --git a/spring-demo-1/src/com/luv2code/springdemo/TrackCoach.java b/spring-demo-1/src/com/luv2code/springdemo/TrackCoach.java
index 62a70ad..a60ae4d 100644
--- a/spring-demo-1/src/com/luv2code/springdemo/TrackCoach.java
+++ b/spring-demo-1/src/com/luv2code/springdemo/TrackCoach.java
@@ -2,9 +2,25 @@
 
 public class TrackCoach implements Coach {
 
+	private FortuneService fortuneService;
+
+	public TrackCoach() {
+
+	}
+
+	public TrackCoach(FortuneService fortuneService) {
+		super();
+		this.fortuneService = fortuneService;
+	}
+
 	@Override
 	public String getDailyWorkout() {
 		return "Run a hard 5K";
 	}
 
+	@Override
+	public String getDailyFortune() {
+		return "Just do it: " + fortuneService.getFortune();
+	}
+
 }