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POCoding something about a rectangle (Java)
 

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  1. POCoding something about a rectangle (Java)
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    <p>so in my online class I have to do something related to rectangles. I have some confusion on how to edit my main class to make it use a method from another class. </p> <p>Here is the link of the project just incase you don't understand what I'm going to ask: <a href="http://pages.eimacs.com/eimacsstatics/download/apjava/project1bj.pdf" rel="nofollow">http://pages.eimacs.com/eimacsstatics/download/apjava/project1bj.pdf</a></p> <p>The part I'm confused about is adding a definition for printAPRectangle, because I don't think I'm doing it correctly.</p> <blockquote> <p>Add accessor instance methods for the three instance variables, and then click the Compile button on the APRectangle class editor window to compile your code and check for errors.</p> <p>Reopen the definition of MainClass and insert a definition of the static method printAPRectangle after the definition of printAPPoint. This method should be defined in such a way that, if it is applied to the APRectangle object whose top left corner is the APPoint object with coordinate (-5.0,3.6),</p> </blockquote> <p>Here is my APRectangle class code:</p> <pre><code> public class APRectangle { private APPoint myTopLeft; private double myWidth; private double myHeight; public APRectangle( APPoint topLeft, double width, double height ) { myTopLeft = topLeft; myWidth = width; myHeight = height; } public APPoint getTopLeft() { return myTopLeft; } public double getWidth() { return myWidth; } public double getHeight() { return myHeight; } } </code></pre> <p>Here is my APPoint class:</p> <blockquote> <p>public class APPoint { private double myX; private double myY;</p> <pre><code>public APPoint( double x, double y ) { myX = x; myY = y; } public double getX() { return myX; } public void setX( double x ) { myX = x; } public double getY() { return myY; } public void setY( double y ) { myY = y; } } </code></pre> </blockquote> <p>and finally here is my Main Class:</p> <pre><code>public class MainClass { public MainClass() { } public static String printAPPoint( APPoint p ) { return "(" + p.getX() + "," + p.getY() + ")"; } public static String printAPRectangle( APRectangle R) { return "[APRectangle " + printAPPoint( + " " + getWidth() + "," + getHeight() + "]" ; } public static void main(String[] args) { APPoint p = new APPoint( 1.0, 2.0 ); APRectangle R = new APRectangle( q, 7.5, 3.6); System.out.println( "p is " + printAPPoint( p ) ); System.out.println( "Done!" ); } } </code></pre> <p>I don't know how to do the part that asks me how to edit the main class, and also the part where I have to output myTopLeft because it's an APPoint and not a normal string. It says I have to use printAPPoint but how do i use it?</p> <p>Thanks, Rohan</p>
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    1. COWhy don't you add system.out.prinltln("R is " + printAPRectangle(R)); to your main() method?
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    2. COUm, I did that but I changed my main class so basically in the main it says APRectangle R = new APRectangle( p, 7.5, 3.6 ) so my problem is in the method printAPRectangle is that I don't know how to get the printAPPoint(p) to work. because I get an error saying variable p cannot be found
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