Create Object Demo : class object « Class « Java

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Java » Class » class object 




Create Object Demo
Create Object Demo
 
/* From http://java.sun.com/docs/books/tutorial/index.html */
/*
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 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
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 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */
public class CreateObjectDemo {
  public static void main(String[] args) {

    // create a point object and two rectangle objects
    Point origin_one = new Point(2394);
    Rectangle rect_one = new Rectangle(origin_one, 100200);
    Rectangle rect_two = new Rectangle(50100);

    // display rect_one's width, height, and area
    System.out.println("Width of rect_one: " + rect_one.width);
    System.out.println("Height of rect_one: " + rect_one.height);
    System.out.println("Area of rect_one: " + rect_one.area());

    // set rect_two's position
    rect_two.origin = origin_one;

    // display rect_two's position
    System.out.println("X Position of rect_two: " + rect_two.origin.x);
    System.out.println("Y Position of rect_two: " + rect_two.origin.y);

    // move rect_two and display its new position
    rect_two.move(4072);
    System.out.println("X Position of rect_two: " + rect_two.origin.x);
    System.out.println("Y Position of rect_two: " + rect_two.origin.y);
  }
}

class Point {
  public int x = 0;

  public int y = 0;

  // a constructor!
  public Point(int x, int y) {
    this.x = x;
    this.y = y;
  }
}

class Rectangle {
  public int width = 0;

  public int height = 0;

  public Point origin;

  // four constructors
  public Rectangle() {
    origin = new Point(00);
  }

  public Rectangle(Point p) {
    origin = p;
  }

  public Rectangle(int w, int h) {
    this(new Point(00), w, h);
  }

  public Rectangle(Point p, int w, int h) {
    origin = p;
    width = w;
    height = h;
  }

  // a method for moving the rectangle
  public void move(int x, int y) {
    origin.x = x;
    origin.y = y;
  }

  // a method for computing the area of the rectangle
  public int area() {
    return width * height;
  }
}

           
         
  














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