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POBenefit of Polymorphism
 

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    <p>When I started to look for the benefits of polymorphism, I found with <a href="https://stackoverflow.com/questions/11064409/why-to-use-polymorphism">this</a> question here. But here I was unable to find my answer. Let me tell what I want to find. Here I have some classes:</p> <pre><code>class CoolingMachines{ public void startMachine(){ //No implementationion } public void stopMachine(){ //No implementationion } } class Refrigerator extends CoolingMachines{ public void startMachine(){ System.out.println("Refrigerator Starts"); } public void stopMachine(){ System.out.println("Refrigerator Stop"); } public void trip(){ System.out.println("Refrigerator Trip"); } } class AirConditioner extends CoolingMachines{ public void startMachine(){ System.out.println("AC Starts"); } public void stopMachine(){ System.out.println("AC Stop"); } } public class PolymorphismDemo { CoolingMachines cm = new Refrigerator(); Refrigerator rf = new Refrigerator(); } </code></pre> <p>Now here I created two objects in the Demo class and are references of <code>Refrigerator</code>. I have completely understood that from the <code>rf</code> object I am able to call the <code>trip()</code> method of <code>Refrigerator</code>, but that method will be hidden for the <code>cm</code> object. Now my question is why should I use polymorphism or why should I use</p> <pre><code>CoolingMachines cm = new Refrigerator(); </code></pre> <p>when I am OK with</p> <pre><code>Refrigerator rf = new Refrigerator(); </code></pre> <p>Is polymorphic object's efficiency is good or light in weight? What is the basic purpose and difference between both of these objects? Is there any difference between <code>cm.start();</code> and <code>rf.start()</code>?</p>
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