added facade sample

facade/src/main/java/com/iluwatar/App.java

@@ -0,0 +1,12 @@
+package com.iluwatar;
+
+public class App 
+{
+    public static void main( String[] args )
+    {
+    	DwarvenGoldmineFacade facade = new DwarvenGoldmineFacade();
+    	facade.startNewDay();
+    	facade.digOutGold();
+    	facade.endDay();
+    }
+}

facade/src/main/java/com/iluwatar/DwarvenCartOperator.java

@@ -0,0 +1,15 @@
+package com.iluwatar;
+
+public class DwarvenCartOperator extends DwarvenMineWorker {
+
+	@Override
+	public void work() {
+		System.out.println(name() + " moves gold chunks out of the mine.");
+	}
+
+	@Override
+	public String name() {
+		return "Dwarf cart operator";
+	}
+
+}

facade/src/main/java/com/iluwatar/DwarvenGoldDigger.java

@@ -0,0 +1,15 @@
+package com.iluwatar;
+
+public class DwarvenGoldDigger extends DwarvenMineWorker {
+
+	@Override
+	public void work() {
+		System.out.println(name() + " digs for gold.");
+	}
+
+	@Override
+	public String name() {
+		return "Dwarf gold digger";
+	}
+
+}

facade/src/main/java/com/iluwatar/DwarvenGoldmineFacade.java

@@ -0,0 +1,37 @@
+package com.iluwatar;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class DwarvenGoldmineFacade {
+
+	List<DwarvenMineWorker> workers;
+	
+	public DwarvenGoldmineFacade() {
+		workers = new ArrayList<>();
+		workers.add(new DwarvenGoldDigger());
+		workers.add(new DwarvenCartOperator());
+		workers.add(new DwarvenTunnelDigger());
+	}
+	
+	public void startNewDay() {
+		for (DwarvenMineWorker worker: workers) {
+			worker.wakeUp();
+			worker.goToMine();
+		}
+	}
+	
+	public void digOutGold() {
+		for (DwarvenMineWorker worker: workers) {
+			worker.work();
+		}
+	}
+	
+	public void endDay() {
+		for (DwarvenMineWorker worker: workers) {
+			worker.goHome();
+			worker.goToSleep();
+		}
+	}
+	
+}

facade/src/main/java/com/iluwatar/DwarvenMineWorker.java

@@ -0,0 +1,25 @@
+package com.iluwatar;
+
+public abstract class DwarvenMineWorker {
+
+	public void goToSleep() {
+		System.out.println(name() + " goes to sleep.");
+	}
+	
+	public void wakeUp() {
+		System.out.println(name() + " wakes up.");
+	}
+	
+	public void goHome() {
+		System.out.println(name() + " goes home.");
+	}
+	
+	public void goToMine() {
+		System.out.println(name() + " goes to the mine.");
+	}
+	
+	public abstract void work();
+	
+	public abstract String name();
+	
+}

facade/src/main/java/com/iluwatar/DwarvenTunnelDigger.java

@@ -0,0 +1,15 @@
+package com.iluwatar;
+
+public class DwarvenTunnelDigger extends DwarvenMineWorker {
+
+	@Override
+	public void work() {
+		System.out.println(name() + " creates another promising tunnel.");
+	}
+
+	@Override
+	public String name() {
+		return "Dwarven tunnel digger";
+	}
+
+}