Work on Dependency Injection example.

dependency-injection/src/main/java/com/iluwatar/App.java

@@ -3,5 +3,7 @@ package com.iluwatar;
 public class App {
 	
     public static void main( String[] args ) {
+    	Wizard wizard = new Wizard();
+    	wizard.smoke();
     }
 }

dependency-injection/src/main/java/com/iluwatar/OldTobyTobacco.java

@@ -0,0 +1,9 @@
+package com.iluwatar;
+
+public class OldTobyTobacco implements Tobacco {
+
+	@Override
+	public void smoke() {
+		System.out.println(String.format("Smoking %s", this.getClass().getSimpleName()));
+	}
+}

dependency-injection/src/main/java/com/iluwatar/Tobacco.java

@@ -0,0 +1,7 @@
+package com.iluwatar;
+
+public interface Tobacco {
+	
+	public void smoke();
+
+}

dependency-injection/src/main/java/com/iluwatar/Wizard.java

@@ -0,0 +1,10 @@
+package com.iluwatar;
+
+public class Wizard {
+	
+	private OldTobyTobacco tobacco = new OldTobyTobacco();
+	
+	public void smoke() {
+		tobacco.smoke();
+	}
+}