Create Object Demo : class object « Class « Java
Create Object Demo
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public class CreateObjectDemo {
public static void main(String[] args) {
// create a point object and two rectangle objects
Point origin_one = new Point(23, 94);
Rectangle rect_one = new Rectangle(origin_one, 100, 200);
Rectangle rect_two = new Rectangle(50, 100);
// 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(40, 72);
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(0, 0);
}
public Rectangle(Point p) {
origin = p;
}
public Rectangle(int w, int h) {
this(new Point(0, 0), 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;
}
}
