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POWorking with classes and and if-else statements. Wondering if someone can explain certain parts better.
 

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  1. POWorking with classes and and if-else statements. Wondering if someone can explain certain parts better.
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    <p>Just as the title states. I have been working with classes for a couple of classes in school now but I don't really understand the why portion of what I am doing. My code may not be perfect but I have commented out some of the questions I have pertaining to this and other programs I wrote like it. This particular program takes the number of software packages sold in a software class with a discount for different levels of purchases. Then in another class it will calculate or should i say, display the total based on the entered number of packages sold. My questions are commented out in the code. Thank you everyone so much. I know that this stuff is very elementary as far as java goes but I am having trouble understanding the why's of it all. </p> <pre><code>public class SoftwareSaleClass { private double quantity; // Should this really be private? This is the way my teacher suggested when creating classes. public SoftwareSaleClass (double q ) { quantity = q; // why do I have to put this here? I never use the q for anything but Eclipse says I need a constructor } public double getQuantity() { return quantity; // Does this need to be here? If so why? I never use it in the tester class or do I? } public double getYourTotal() {double total; if (quantity &gt;= 10 &amp;&amp; quantity &lt;= 19) { total = (99 * quantity * .80); } else if (quantity &gt;= 20 &amp;&amp; quantity &lt;= 49) { total = (99 * quantity * .70); } else if (quantity &gt;= 50 &amp;&amp; quantity &lt;= 99) { total = (99 * quantity * .60); } else if (quantity &gt;= 100) { total = (99 * quantity * .50); } else total = (99 * quantity); return total; } // This part I totally understand the why, although I think my math isn't quite right. } import java.util.Scanner; public class SoftwareSalesTester { public static void main(String[] args) { double quantity; // Does this above double point to the other class or is it possible i could have named it something else? Scanner keyboard = new Scanner(System.in); System.out.print("Enter the amount of packages being sold: "); quantity = keyboard.nextDouble(); SoftwareSaleClass grandTotal = new SoftwareSaleClass(quantity); System.out.println("Your grand total today is: " + grandTotal.getYourTotal() + "\nWe Gladly Accept VISA, MASTERCARD, AND CASH MONEY!"); } } </code></pre>
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    1. COOk, if my question shows so much lack of research can someone point me somewhere to get a better understanding of classes other than my college course and the java tutorials on oracle? I obviously researched enough to make the two classes and get it to work :(
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