Object Oriented Programming Basics for the BKT Client - MISC

Rectangle               \This is your (Class)
---------------
length: real              \\THESE ARE (Data Members)
breadth: real
----------------
are(): real
perimeter(): real       \\\These are (Methods)
diagnol(): real
isSquare(): boolean
shorterSide(): real
longerSide(): real
equals(rectangle): boolean
--------------------------------

Normally a CLASS of an object is written with the first character as a capital. Such as Rectangle not "rectangle"

Reason why you write Rectangle with a capital is to defirentiate it to be a CLASS.

Important Methods for String data types:

.charAt(int) : char
.indexOf(char): int
.indexOf(String): int
.substring(begin): String
.toLowerCase(): String     --> ("HelLO BKT" --> becomes "hello bkt");

String s = "Finally";
String t = s.substring(0, 5) + "_bkt";     //This method returns  "Final"+"_bkt"
This then gets concatanated and becomes "Final bkt"


String greeting = new String ("hello bkt client"); 
String ("hello bkt client") --> this is a REFERENCE
greeting --> this is the OBJECT

Also key note a String can be thought of a CHARACTER ARRAY, like so (in a string of "Hello") the character array would be:
[0] = 'h'
[1] = 'e'
[2] = 'l'
[3] = 'l'
[4] = 'o'

Code:

public class Rectangle {
  public double width, height;        //My clients data members
 
  public double area(){              //My clients methods
      return width * height;
  }

}


If you want to import certain methods such as pi, type Math.pi
or Math.Cosine to find the Cosine of a triangle.




Thisi s for the client im guessing?