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POJava: using polymorphism to avoid if-statements?
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  1. POJava: using polymorphism to avoid if-statements?
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    copied!<p>I'm attempting to write a java program that initializes certain layouts based on what the user selects. What I want to do is try to avoid writing a bunch of if-statements so the code can be scalable for future use if more layouts need to be added. I heard the best way to implement this is using polymorphism but my understanding of polymorphism is still a little fuzzy. </p> <p>Say I want to implement this case:</p> <pre><code>if (user choose layoutA) { initialize layoutA } if (user choose layoutB) { initialize layoutB } if (user choose layoutC) {initialize layoutC } </code></pre> <p>I was thinking of creating an interface for classes to implement. What confuses me is how it works in main(), won't I still need a conditional if or switch statement to figure out which class to instantiate? </p> <pre><code>interface LayoutHandler { public void initializeLayout(); } class layoutA implements LayoutHandler { public void initialize Layout {initialize layout A} } class layoutB implements LayoutHandler { public void initialize Layout {initialize layout B} } class layoutC implements LayoutHandler { public void initialize Layout {initialize layout C} } </code></pre> <p>Then somewhere out in main:</p> <pre><code>public static void main() { getlayoutselectionfromuser() if (user choose layoutA) { LayoutHandler layout = new layoutA(); } if (user choose layoutB) { LayoutHandler layout = new layoutB(); } if (user choose layoutC) { LayoutHandler layout = new layoutC(); } } </code></pre> <p>Wouldn't I still require a switch or if-statement in the main program to figure out which layout the user has chosen during runtime? </p> <p>Thanks! </p>
 

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