diff --git a/System Development/PatternStrategy/.classpath b/System Development/PatternStrategy/.classpath
new file mode 100644
index 0000000..fb50116
--- /dev/null
+++ b/System Development/PatternStrategy/.classpath	
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>
diff --git a/System Development/PatternStrategy/.project b/System Development/PatternStrategy/.project
new file mode 100644
index 0000000..058be17
--- /dev/null
+++ b/System Development/PatternStrategy/.project	
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>PatternStrategy</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>
diff --git a/System Development/PatternStrategy/src/DoAdd.java b/System Development/PatternStrategy/src/DoAdd.java
new file mode 100644
index 0000000..f45519b
--- /dev/null
+++ b/System Development/PatternStrategy/src/DoAdd.java	
@@ -0,0 +1,6 @@
+public class DoAdd implements Strategy{
+   @Override
+   public int doOperation(int num1, int num2) {
+      return num1 + num2;
+   }
+}
\ No newline at end of file
diff --git a/System Development/PatternStrategy/src/DoMultiply.java b/System Development/PatternStrategy/src/DoMultiply.java
new file mode 100644
index 0000000..53b0cdd
--- /dev/null
+++ b/System Development/PatternStrategy/src/DoMultiply.java	
@@ -0,0 +1,6 @@
+public class DoMultiply implements Strategy{
+   @Override
+   public int doOperation(int num1, int num2) {
+      return num1 * num2;
+   }
+}
\ No newline at end of file
diff --git a/System Development/PatternStrategy/src/DoSubtract.java b/System Development/PatternStrategy/src/DoSubtract.java
new file mode 100644
index 0000000..b24afde
--- /dev/null
+++ b/System Development/PatternStrategy/src/DoSubtract.java	
@@ -0,0 +1,6 @@
+public class DoSubtract implements Strategy{
+   @Override
+   public int doOperation(int num1, int num2) {
+      return num1 - num2;
+   }
+}
\ No newline at end of file
diff --git a/System Development/PatternStrategy/src/PatternStrategy.java b/System Development/PatternStrategy/src/PatternStrategy.java
new file mode 100644
index 0000000..aede201
--- /dev/null
+++ b/System Development/PatternStrategy/src/PatternStrategy.java	
@@ -0,0 +1,13 @@
+
+public class PatternStrategy {
+	   public static void main(String[] args) {
+		      SelectToDo toDo1 = new SelectToDo(new DoAdd());		
+		      System.out.println("3 + 2 = " + toDo1.executeStrategy(3, 2));
+
+		      SelectToDo toDo2 = new SelectToDo(new DoSubtract());		
+		      System.out.println("3 - 2 = " + toDo2.executeStrategy(3, 2));
+
+		      SelectToDo toDo3 = new SelectToDo(new DoMultiply());		
+		      System.out.println("3 * 2 = " + toDo3.executeStrategy(3, 2));
+		   }
+}
diff --git a/System Development/PatternStrategy/src/SelectToDo.java b/System Development/PatternStrategy/src/SelectToDo.java
new file mode 100644
index 0000000..c4d2e26
--- /dev/null
+++ b/System Development/PatternStrategy/src/SelectToDo.java	
@@ -0,0 +1,12 @@
+
+public class SelectToDo {
+	   private Strategy strategy;
+
+	   public SelectToDo(Strategy strategy){
+	      this.strategy = strategy;
+	   }
+
+	   public int executeStrategy(int num1, int num2){
+	      return strategy.doOperation(num1, num2);
+	   }
+}
diff --git a/System Development/PatternStrategy/src/Strategy.java b/System Development/PatternStrategy/src/Strategy.java
new file mode 100644
index 0000000..73f808c
--- /dev/null
+++ b/System Development/PatternStrategy/src/Strategy.java	
@@ -0,0 +1,4 @@
+
+public interface Strategy {
+	public int doOperation(int num1, int num2);
+}