Code d’exemple création de la classe Rectangle

Fichier RectangleDemoBegin.java

public class RectangleDemoBegin {
	
	public static void main(String args[]) {			
		Rectangle r1 = new Rectangle();
		r1.height = 4;
		r1.width = 4;
		
		Rectangle r2 = new Rectangle();
		r2.height = 5;
		r2.width = 6;
		
		Rectangle r3 = new Rectangle();
		r3.height = 2;
		r3.width = 2;
		
		int totalArea = r1.area();
		totalArea += r2.area();
		totalArea += r3.area();
		
		System.out.println(totalArea);
		
	}
}

Fichier Rectangle.java

public class Rectangle {
	int width;
	int height;
	
	public int area() {
		return width * height;
	}
}