BIM Notes – Page 49

ss a 12 13 14. Design an asynchronous MOD-440 Counter. 15 16 17 b

Co 2022 old paper solution

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JAVA 2 5th sem Solution || BIM STUDY NOTES

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OOAD 2019 Makeup solution || BIM STUDY NOTES

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Group B 2019 Q.NO 2 Q.no 7

OOAD 2017 old paper Solution

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Group C Q.no 8 Step 1

public interface Shape {
   void draw();
}

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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>

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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>

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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>

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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>

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