Strategy Design Pattern - Mountaineering application

premaseem · premaseem · commit fefedd413d83 · 2018-03-09T13:10:48.000-06:00
diff --git a/pattern/src/com/premaseem/Client.java b/pattern/src/com/premaseem/Client.java
@@ -1,13 +1,24 @@
 package com.premaseem;
 
+import java.util.Scanner;
+
 /*
 @author: Aseem Jain
 @title: Design Patterns with Java 9
 @link: https://premaseem.wordpress.com/category/computers/design-patterns/
-@copyright: 2018 Packt Publication
 */
 public class Client {
     public static void main (String[] args) {
-        System.out.println("Singleton cook example ");
+        System.out.println("Strategy Design pattern - Mountaineering app ");
+        System.out.println("Lets decide the strategy to cross mountain crevasse ");
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("Enter the distance of crevasse ...");
+        int distance = scanner.nextInt();
+
+        Context context = new Context();
+        CrevasseCrossingStrategy crossingStrategy = context.getCrevasseCrossingStrategy(distance);
+        System.out.println("Using Strategy : "+ crossingStrategy.getClass().getSimpleName());
+        crossingStrategy.crossCrevasse();
+
     }
 }
diff --git a/pattern/src/com/premaseem/Context.java b/pattern/src/com/premaseem/Context.java
@@ -0,0 +1,20 @@
+package com.premaseem;
+
+/*
+@author: Aseem Jain
+@title: Design Patterns with Java 9
+@link: https://premaseem.wordpress.com/category/computers/design-patterns/
+*/
+public class Context {
+
+    CrevasseCrossingStrategy crevasseCrossingStrategy;
+
+    public CrevasseCrossingStrategy getCrevasseCrossingStrategy (Integer distance) {
+        if (distance < 3){
+            crevasseCrossingStrategy = new JumpCrossStrategy();
+        } else {
+            crevasseCrossingStrategy = new RopeCrossStrategy();
+        }
+        return crevasseCrossingStrategy;
+    }
+}
diff --git a/pattern/src/com/premaseem/CrevasseCrossingStrategy.java b/pattern/src/com/premaseem/CrevasseCrossingStrategy.java
@@ -0,0 +1,37 @@
+package com.premaseem;
+
+/*
+@author: Aseem Jain
+@title: Design Patterns with Java 9
+@link: https://premaseem.wordpress.com/category/computers/design-patterns/
+*/
+interface CrevasseCrossingStrategy {
+    // Algorithm is collection of steps
+    void crossCrevasse();
+}
+
+class JumpCrossStrategy implements CrevasseCrossingStrategy {
+
+    // Different algorithm or steps are defined in each sub class
+    @Override
+    public void crossCrevasse () {
+        System.out.println("Move 10 steps back");
+        System.out.println("Start running as fast as possible");
+        System.out.println("Jump over the Crevasse");
+        System.out.println("Stop and Anchor your self");
+    }
+}
+
+class RopeCrossStrategy implements CrevasseCrossingStrategy {
+
+    // Different algorithm or steps are defined in each sub class
+    @Override
+    public void crossCrevasse () {
+        System.out.println("Use Kernmantle rope");
+        System.out.println("Tie rope with Anchor and through it on other side");
+        System.out.println("Fix carabiner and fix it in rope");
+        System.out.println("Cross using rope and untie yourself");
+    }
+}
+
+
