Mondai14_1.java

interface PlaneFigure{
    public static final String TYPE="plane figure";
    public float getArea(float base, float height);
}

class Figure{
    String type="figure";
    public String getType(){
		return type;
    }
}

class Triangle extends Figure implements PlaneFigure{
    String figureName ="triangle";
    public String getFigureName(){
	return figureName;
    }
    public float getArea(float base, float height){
	float area = base * height/2;
	return area;
    }
}

class Rectangle extends Figure implements PlaneFigure{
    String figureName="rectangle";
    public String getFigureName(){
	return figureName;
    }
    public float getArea(float base, float height){
	float area = base*height;
	return area;
    }
}

class Test{
    public static void main(String[] args){
	PlaneFigure figure1=new Triangle();
	PlaneFigure figure2=new Rectangle();
	float area1 = figure1.getArea(10.0f, 12.0f);
	System.out.println("the area of figure1 is " + area1);

	float area2 = figure2.getArea(10.0f, 12.0f);
	System.out.println("the area of figure2 is " + area2);
	System.out.println("figure1 is " + figure1.TYPE);
	System.out.println(((Triangle)figure1).getFigureName());
    }
}