ooad bim

Group C Q.no 8 Step 1

public interface Shape {
   void draw();
}

public interface Shape {

void draw();

}

Create an interface. Shape.java Step 2 Create concrete classes implementing the same interface. Rectangle.java

<span class="kwd">public</span> <span class="kwd">class</span> <span class="typ">Rectangle</span> <span class="kwd">implements</span> <span class="typ">Shape</span> <span class="pun">{</span>
   <span class="lit">@Override</span>
   <span class="kwd">public</span> <span class="kwd">void</span><span class="pln"> draw</span><span class="pun">()</span> <span class="pun">{</span>
      <span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Inside Rectangle::draw() method."</span><span class="pun">);</span>
   <span class="pun">}</span>
<span class="pun">}</span>

public class Rectangle implements Shape {

@Override

public void draw() {

System.out.println("Inside Rectangle::draw() method.");

}

Square.java

<span class="kwd">public</span> <span class="kwd">class</span> <span class="typ">Square</span> <span class="kwd">implements</span> <span class="typ">Shape</span> <span class="pun">{</span>
   <span class="lit">@Override</span>
   <span class="kwd">public</span> <span class="kwd">void</span><span class="pln"> draw</span><span class="pun">()</span> <span class="pun">{</span>
      <span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Inside Square::draw() method."</span><span class="pun">);</span>
   <span class="pun">}</span>
<span class="pun">}</span>

public class Square implements Shape {

@Override

public void draw() {

System.out.println("Inside Square::draw() method.");

}

Circle.java

<span class="kwd">public</span> <span class="kwd">class</span> <span class="typ">Circle</span> <span class="kwd">implements</span> <span class="typ">Shape</span> <span class="pun">{</span>
   <span class="lit">@Override</span>
   <span class="kwd">public</span> <span class="kwd">void</span><span class="pln"> draw</span><span class="pun">()</span> <span class="pun">{</span>
      <span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Inside Circle::draw() method."</span><span class="pun">);</span>
   <span class="pun">}</span>
<span class="pun">}</span>

public class Circle implements Shape {

@Override

public void draw() {

System.out.println("Inside Circle::draw() method.");

}

Step 3 Create a Factory to generate object of concrete class based on given information. ShapeFactory.java

<span class="kwd">public</span> <span class="kwd">class</span> <span class="typ">ShapeFactory</span> <span class="pun">{</span>
   <span class="com">//use getShape method to get object of type shape </span>
   <span class="kwd">public</span> <span class="typ">Shape</span><span class="pln"> getShape</span><span class="pun">(</span><span class="typ">String</span><span class="pln"> shapeType</span><span class="pun">){</span>
      <span class="kwd">if</span><span class="pun">(</span><span class="pln">shapeType </span><span class="pun">==</span> <span class="kwd">null</span><span class="pun">){</span>
         <span class="kwd">return</span> <span class="kwd">null</span><span class="pun">;</span>
      <span class="pun">}</span>
      <span class="kwd">if</span><span class="pun">(</span><span class="pln">shapeType</span><span class="pun">.</span><span class="pln">equalsIgnoreCase</span><span class="pun">(</span><span class="str">"CIRCLE"</span><span class="pun">)){</span>
         <span class="kwd">return</span> <span class="kwd">new</span> <span class="typ">Circle</span><span class="pun">();</span>
      <span class="pun">}</span> <span class="kwd">else</span> <span class="kwd">if</span><span class="pun">(</span><span class="pln">shapeType</span><span class="pun">.</span><span class="pln">equalsIgnoreCase</span><span class="pun">(</span><span class="str">"RECTANGLE"</span><span class="pun">)){</span>
         <span class="kwd">return</span> <span class="kwd">new</span> <span class="typ">Rectangle</span><span class="pun">();</span>
      <span class="pun">}</span> <span class="kwd">else</span> <span class="kwd">if</span><span class="pun">(</span><span class="pln">shapeType</span><span class="pun">.</span><span class="pln">equalsIgnoreCase</span><span class="pun">(</span><span class="str">"SQUARE"</span><span class="pun">)){</span>
         <span class="kwd">return</span> <span class="kwd">new</span> <span class="typ">Square</span><span class="pun">();</span>
      <span class="pun">}</span>
      <span class="kwd">return</span> <span class="kwd">null</span><span class="pun">;</span>
   <span class="pun">}</span>
<span class="pun">}</span>

public class ShapeFactory {

//use getShape method to get object of type shape

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();

return new Square();

}

return null;

}

Step 4 Use the Factory to get object of concrete class by […]

Tag: ooad bim

OOAD 2017 old paper Solution