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math456

I need help, plz! Design and implement in Java, a class Rectangular tht supports two methods: 1). Area(double x, double y) tht returns the area of a rectangular of width x and length y. 2). perimeter(double x, double y) tht returns the perimeter length of a rectangle of width x & length y.

  • one year ago
  • one year ago

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  1. eSpeX
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    And what part did you get stuck on?

    • one year ago
  2. math456
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    public class Areas { public static void main( String [] args) { area (int, double x) like what should i write to return the area of a rectangular of the width & length?

    • one year ago
  3. eSpeX
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    Well, your area method takes an int and a double, so you probably want to return a double.

    • one year ago
  4. eSpeX
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    As for what you should put inside the method, consider the steps you must take to calculate the area. You will need to take in two variables, width and height, then multiply them together to get the area.

    • one year ago
  5. eSpeX
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    You have been given the definitions for both of your methods, just put the calculation inside that is needed to get the area and perimeter into each of their respective functions.

    • one year ago
  6. math456
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    oh so meaning: area ( width x, length y) area = w x h

    • one year ago
  7. eSpeX
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    Yes, but unless you are going to print it out within the method or assign it to a variable you can access, you will want to "return area = wxh;" or some similar operation.

    • one year ago
  8. math456
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    like this? public class Rectangular { public static void main(String [] args) { area (int length x; int width y); return area = x*y; } System.out.print( "area" ); }

    • one year ago
  9. math456
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    @shadowfiend @ganeshie8 ?

    • one year ago
  10. eSpeX
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    You're on the right track, try something like this: import java.util.*; public class Rectangle{ public static void main(String[] args){ double area, x, y; Scanner in = new Scanner(System.in); System.out.println("Please enter your width"); x = in.nextDouble(); System.out.println("Please enter your length"); y = in.nextDouble(); get_area(double x, double y){ area = x*y; System.out.println("The area of the rectangle is: " + area + "\n"); } } }

    • one year ago
  11. KonradZuse
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    YOu should honestly look at the Java API for 2 reasons. 1 it uses doubles and it's a rectangle which is what you're looking for. http://docs.oracle.com/javase/6/docs/api/java/awt/Rectangle.html Rectangle getBounds() Gets the bounding Rectangle of this Rectangle. To make your own class like this you could do a few things. First is to set it up like you normally would. class rect { double w,h; rect() { //if you need constructor calls, most likely you would want this constructor below } rect(double length, double width) { this.w = width; this.h = height; //this will set the height and width of the new rectangle object you create //to create a new rectangle object you would do rect r = new rect(); or rect r = new rect(10,10); this makes both height and width 10. } next you will want methods TO SET and GET known as getters and settings... public setWidth(double w) { this.w = w; } public getWidth() { return w; //returning will return the global variable at the top which is our width. } same will be done with height.

    • one year ago
  12. eSpeX
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    Given the examples provided earlier, you may be offering a solution above his experience.

    • one year ago
  13. KonradZuse
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    Next you could make a class that extends the rectangle class i.e., class rect extends Rectangle2D.Double { //code } this overrides Rectangle and you can use it's methods, or make your own.

    • one year ago
  14. KonradZuse
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    public void setWidth(double w) { this.w = w; } public double getWidth() { return w; //returning will return the global variable at the top which is our width. } IS what should be stated above.

    • one year ago
  15. KonradZuse
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    I don't think it's too hard, this is basic stuff. I explained in my comments what does what. I would assume that if he were too new, he wouldn't understand what the Scanner is either :P.

    • one year ago
  16. eSpeX
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    Fair enough, I did consider that as I typed it. :)

    • one year ago
  17. KonradZuse
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    Imo it's better to see correct and complete code than to fumble around a lot.... OF course learning it yourself makes you understand it better, a good combo of both if perfect imo.

    • one year ago
  18. math456
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    @hartnn @.Sam. ??

    • one year ago
  19. math456
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    @eSpeX i don't hv to use Scanner problem in this program!

    • one year ago
  20. math456
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    @ganeshie8 ?

    • one year ago
  21. KonradZuse
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    .....?

    • one year ago
  22. math456
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    i tried this, but it shows me error!! public class Rectangular { public static area(double x, double y) { return x*y; } public static perimeter (double x, double y) { return (2*x + 2*y); } }

    • one year ago
  23. math456
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    @KonradZuse @eSpeX

    • one year ago
  24. KonradZuse
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    yes because you are not doing anything.

    • one year ago
  25. KonradZuse
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    Basically when you create an object it's like making the frame.

    • one year ago
  26. KonradZuse
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    in the oracle trail it talks about a bicycle.

    • one year ago
  27. KonradZuse
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    it has methods like speed up, speed down, brake, etc. This is what we are doing. If you look above at what I said you can make it work.

    • one year ago
  28. KonradZuse
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    In your own class right now you want to make a main method and that main method will create what you need.

    • one year ago
  29. KonradZuse
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    class rect { double w,h; rect() { //if you need constructor calls, most likely you would want this constructor below } rect(double length, double width) { this.w = width; this.h = height; Constructor calls are important.

    • one year ago
  30. math456
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    public class Rectangular { public static void main (String [] args) { double width,length; x= width; y= length; rectangular (); return x*y; public static perimeter (double x, double y) { return rectangular (2*x + 2*y); } } } Still shows error!

    • one year ago
  31. math456
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    can't u tell like what are my mistakes and wht do I need to write instead?

    • one year ago
  32. math456
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    @KonradZuse ?

    • one year ago
  33. math456
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    so this is the new one and it compiles well but I only need the print statement to return the area of a rectangular of width x and length y.! @eSpeX @KonradZuse public class Rectangular { public static void main (String [] args) { } public double area (double x, double y) { return (x*y); } public double perimeter (double x, double y) { return (2*x + 2*y); } }

    • one year ago
  34. eSpeX
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    @math456 You do not have anything calling those methods, therefore you have nothing to catch the returned values. If you are going to make it without interaction from a user, why not just use System.out.println instead of a return statement?

    • one year ago
  35. KonradZuse
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    I already showed you what you need. public static void main (String [] args) { Rectangular r = new Rectangular(); } if you make a constructor as shown above then you will be able to make an object.

    • one year ago
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