Group1

Homeworks/Answer.md

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+1. Homework1
+Bridge pattern: folder bridge
+Shape có 2 loại thể hiện là: Triangle, Circle
+Color có 2 loại thể hiện là: GreenColor, BlueColor
+Theo bridge pattern:
+- Abstraction: Circle, Triangle
+- Implementation: GreenColor, Bluecolor
+Absraction sẽ sử dụng 1 trong các Implementation để tô màu cho Shape
+
+Null Object Pattern: folder null_obejct_pattern
+Nếu không có subscription -> Return Nosubscription.new
+
+Factory Method: folder factory_method
+- Creator: Shape
+- Creator implementation: Circle, Rectangle, Square
+- Factory: ShapeFactory
+Khi muốn khởi tạo Circle, Rectangle, Square  chỉ cần khởi tạo qua ShapeFactory
+VD: new Shape("CIRCLE")
+-> "creating objects without having to specify the exact class of the object that will be created"

Homeworks/bridge/BlueColor.java

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+public class BlueColor implements Color{
+    public void fillColor(){
+    }
+}

Homeworks/bridge/Circle.java

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+public class Circle extends Shape{
+    public void get() {
+    }
+}

Homeworks/bridge/Color.java

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+public interface Color {
+    public void fillColor();
+}

Homeworks/bridge/GreenColor.java

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+public class GreenColor implements Color{
+    public void fillColor(){
+
+    }
+}

Homeworks/bridge/Shape.java

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+public class Shape {
+    private Object implementation;
+
+    public Shape(Object implementation) {
+        this.implementation = implementation;
+    }
+
+    public void paint() {
+    }
+
+    public void getColor() {
+    }
+}

Homeworks/bridge/Triangle.java

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+public class Triangle extends Shape{
+    public void get() {
+    }
+}

Homeworks/bridge/bridge.uml

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+<?xml version="1.0" encoding="UTF-8"?>
+<Diagram>
+  <ID>JAVA</ID>
+  <OriginalElement />
+  <nodes>
+    <node x="150.0" y="462.0">jdk</node>
+    <node x="146.0" y="169.0">Circle</node>
+    <node x="338.125" y="456.25">java</node>
+    <node x="34.0" y="0.0">Shape</node>
+    <node x="175.0" y="366.0">BlueColor</node>
+    <node x="87.5" y="265.0">Color</node>
+    <node x="0.0" y="169.0">Triangle</node>
+    <node x="0.0" y="462.0">sun</node>
+    <node x="0.0" y="366.0">GreenColor</node>
+  </nodes>
+  <notes />
+  <edges>
+    <edge source="Circle" target="Shape">
+      <point x="0.0" y="-25.5" />
+      <point x="209.0" y="144.0" />
+      <point x="187.0" y="144.0" />
+      <point x="51.0" y="59.5" />
+    </edge>
+    <edge source="Triangle" target="Shape">
+      <point x="0.0" y="-25.5" />
+      <point x="63.0" y="144.0" />
+      <point x="85.0" y="144.0" />
+      <point x="-51.0" y="59.5" />
+    </edge>
+    <edge source="GreenColor" target="Color">
+      <point x="0.0" y="-25.5" />
+      <point x="77.5" y="341.0" />
+      <point x="126.25" y="341.0" />
+      <point x="-38.75" y="25.5" />
+    </edge>
+    <edge source="BlueColor" target="Color">
+      <point x="0.0" y="-25.5" />
+      <point x="252.5" y="341.0" />
+      <point x="203.75" y="341.0" />
+      <point x="38.75" y="25.5" />
+    </edge>
+  </edges>
+  <settings layout="Hierarchic Group" zoom="1.6" x="277.5" y="223.5625" />
+  <SelectedNodes />
+  <Categories>
+    <Category>Methods</Category>
+    <Category>Constructors</Category>
+    <Category>Properties</Category>
+    <Category>Fields</Category>
+  </Categories>
+  <SCOPE>All</SCOPE>
+  <VISIBILITY>private</VISIBILITY>
+</Diagram>
+

Homeworks/factory_method/Circle.java

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+public class Circle implements Shape {
+    public void draw() {
+        System.out.println("Circle");
+    }
+}

Homeworks/factory_method/Rectangle.java

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+public class Rectangle implements Shape {
+    public void draw() {
+        System.out.println("Shape");
+    }
+}

Homeworks/factory_method/Shape.java

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+public interface Shape {
+    void draw();
+}

Homeworks/factory_method/ShapeFactory.java

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+public class ShapeFactory {
+    public Shape getShape(String shapeType){
+        if(shapeType == null){
+            return null;
+        }
+        if(shapeType.equalsIgnoreCase("CIRCLE")){
+            return new Circle();
+
+        } else if(shapeType.equalsIgnoreCase("RECTANGLE")){
+            return new Rectangle();
+
+        } else if(shapeType.equalsIgnoreCase("SQUARE")){
+            return new Square();
+        }
+
+        return null;
+    }
+}

Homeworks/factory_method/Square.java

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+public class Square implements Shape {
+    public void draw() {
+        System.out.println("Square");
+    }
+}

Homeworks/factory_method/factory_method.uml

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+<?xml version="1.0" encoding="UTF-8"?>
+<Diagram>
+  <ID>JAVA</ID>
+  <OriginalElement />
+  <nodes>
+    <node x="252.0" y="197.0">META-INF</node>
+    <node x="161.0" y="293.0">com</node>
+    <node x="150.0" y="441.0">jdk</node>
+    <node x="0.0" y="101.0">Circle</node>
+    <node x="156.0" y="0.0">Shape</node>
+    <node x="0.0" y="367.0">java</node>
+    <node x="154.0" y="367.0">org</node>
+    <node x="0.0" y="293.0">javax</node>
+    <node x="156.0" y="101.0">Rectangle</node>
+    <node x="0.0" y="197.0">ShapeFactory</node>
+    <node x="312.0" y="101.0">Square</node>
+    <node x="0.0" y="441.0">sun</node>
+  </nodes>
+  <notes />
+  <edges>
+    <edge source="Circle" target="Shape">
+      <point x="0.0" y="-25.5" />
+      <point x="68.0" y="76.0" />
+      <point x="178.66666666666666" y="76.0" />
+      <point x="-45.33333333333334" y="25.5" />
+    </edge>
+    <edge source="Rectangle" target="Shape">
+      <point x="0.0" y="-25.5" />
+      <point x="0.0" y="25.5" />
+    </edge>
+    <edge source="Square" target="Shape">
+      <point x="0.0" y="-25.5" />
+      <point x="380.0" y="76.0" />
+      <point x="269.33333333333337" y="76.0" />
+      <point x="45.33333333333337" y="25.5" />
+    </edge>
+  </edges>
+  <settings layout="Hierarchic Group" zoom="1.0" x="224.0" y="224.0" />
+  <SelectedNodes>
+    <node>META-INF</node>
+  </SelectedNodes>
+  <Categories>
+    <Category>Fields</Category>
+    <Category>Constructors</Category>
+    <Category>Methods</Category>
+    <Category>Properties</Category>
+    <Category>Inner Classes</Category>
+  </Categories>
+  <SCOPE>All</SCOPE>
+  <VISIBILITY>public</VISIBILITY>
+</Diagram>
+

Homeworks/null_object_pattern/no_subscription.rb

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+class NoSubscription
+  def charge(credit_card)
+    "No Charge"
+  end
+
+  def price
+    0
+  end
+
+  def has_mentoring?
+    false
+  end
+end

Homeworks/null_object_pattern/null_object.uml

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+<?xml version="1.0" encoding="UTF-8"?>
+<Diagram>
+  <ID>JAVA</ID>
+  <OriginalElement />
+  <nodes>
+    <node x="127.0" y="2.0">User</node>
+    <node x="123.0" y="247.0">NoSubscription</node>
+  </nodes>
+  <notes />
+  <edges />
+  <settings layout="Hierarchic Group" zoom="1.0" x="745.0" y="407.5" />
+  <SelectedNodes>
+    <node>NoSubscription</node>
+  </SelectedNodes>
+  <Categories>
+    <Category>Inner Classes</Category>
+    <Category>Properties</Category>
+    <Category>Methods</Category>
+    <Category>Fields</Category>
+    <Category>Constructors</Category>
+  </Categories>
+  <SCOPE>All</SCOPE>
+  <VISIBILITY>public</VISIBILITY>
+</Diagram>
+

Homeworks/null_object_pattern/user.rb

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+class User
+  attr_accessor :credit_card, :subscription
+
+  def charge
+    subscription.charge credit_card
+  end
+
+  def has_mentoring?
+    subscription.has_mentoring?
+  end
+
+  def price
+    subscription.price
+  end
+
+  def subscription
+    @subscription ||= NoSubscription.new
+  end
+end