added ex H2

src/exercises/ex_h2/Bridge.java

@@ -0,0 +1,14 @@
+package exercises.ex_h2;
+
+public class Bridge {
+    private Road roadEast = new Road("East");
+    private Road roadWest = new Road("West");
+
+    public Road getRoadEast() {
+        return roadEast;
+    }
+
+    public Road getRoadWest() {
+        return roadWest;
+    }
+}

src/exercises/ex_h2/Road.java

@@ -0,0 +1,14 @@
+package exercises.ex_h2;
+
+public class Road {
+    private String position;
+
+    public Road(String position) {
+        this.position = position;
+    }
+
+    @Override
+    public String toString() {
+        return position + " road";
+    }
+}

src/exercises/ex_h2/TestDeadlockBridge.java

@@ -0,0 +1,13 @@
+package exercises.ex_h2;
+
+public class TestDeadlockBridge {
+    public static void main(String[] args) {
+        Bridge bridge = new Bridge();
+        //(new Thread(new Vehicle("Ferrari", bridge, bridge.getRoadEast()))).start();
+        //(new Thread(new Vehicle("BMW", bridge, bridge.getRoadWest()))).start();
+        // Version without DeadLock
+        (new Thread(new VehicleWithoutDeadlock("Ferrari", bridge, bridge.getRoadEast()))).start();
+        (new Thread(new VehicleWithoutDeadlock("BMW", bridge, bridge.getRoadWest()))).start();
+
+    }
+}

src/exercises/ex_h2/Vehicle.java

@@ -0,0 +1,26 @@
+package exercises.ex_h2;
+
+public class Vehicle implements Runnable {
+    String name;
+    private Bridge bridge;
+    private Road road;
+
+    public Vehicle(String name, Bridge bridge, Road road) {
+        this.name = name;
+        this.bridge = bridge;
+        this.road = road;
+    }
+
+    @Override
+    public void run() {
+        // Do the actions to cross the bridge
+        synchronized (road) {
+            System.out.println(name + " is entering on the one-way bridge from " + road);
+            synchronized (road == bridge.getRoadEast() ?
+                bridge.getRoadWest():
+                bridge.getRoadEast()) {
+                System.out.println(name + " is leaving the one-way bridge");
+            }
+        }
+    }
+}

src/exercises/ex_h2/VehicleWithoutDeadlock.java

@@ -0,0 +1,28 @@
+package exercises.ex_h2;
+
+public class VehicleWithoutDeadlock implements Runnable {
+    String name;
+    private Bridge bridge;
+    private Road road;
+
+    public VehicleWithoutDeadlock(String name, Bridge bridge, Road road) {
+        this.name = name;
+        this.bridge = bridge;
+        this.road = road;
+    }
+
+    @Override
+    public void run() {
+        // Do the actions to cross the bridge
+        synchronized (bridge) {
+            System.out.println(name + " is entering on the one-way bridge from " + road);
+            try {
+                Thread.sleep(100);
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+            System.out.println(name + " is leaving the one-way bridge");
+        }
+    }
+}
+