class DvouDObrazec { //-hierarchie trid
  private double width; 
  private double height; 
 
  DvouDObrazec() { 
    width = height = 0.0; 
  } 
 
  DvouDObrazec(double w, double h) { 
    width = w; 
    height = h; 
  } 
 
  DvouDObrazec(double x) { 
    width = height = x; 
  } 
 
  double getWidth() { return width; } 
  double getHeight() { return height; } 
  void setWidth(double w) { width = w; } 
  void setHeight(double h) { height = h; } 
 
  void showDim() { 
    System.out.println("sirka a vyska jsou " + 
                       width + " a " + height); 
  } 
} 
 
class Trojuhelnik extends DvouDObrazec { 
  private String style; 
   
  Trojuhelnik() { 
    super(); 
    style = ""; 
  } 
 
  Trojuhelnik(String s, double w, double h) { 
    super(w, h);   
    style = s;  
  } 
 
  Trojuhelnik(double x) { 
    super(x);  
    style = "stejne vysoky jako siroky";  
  } 
 
  double area() { 
    return getWidth() * getHeight() / 2; 
  } 
 
  void showStyle() { 
    System.out.println("Trojuhelnik je " + style); 
  } 
} 
 
class BarevnyTrojuhelnik extends Trojuhelnik { 
  private String barva; 
 
  BarevnyTrojuhelnik(String c, String s, 
                double w, double h) { 
    super(s, w, h); 
 
    barva = c; 
  } 
 
  String getBarva() { return barva; } 
 
  void showBarva() { 
    System.out.println("barva je " + barva); 
  } 
} 
 
class ObrazceHierar { 
  public static void main(String args[]) { 
    BarevnyTrojuhelnik t1 =  
         new BarevnyTrojuhelnik("zluty", "placaty", 20.0, 2.0); 
    BarevnyTrojuhelnik t2 =  
         new BarevnyTrojuhelnik("zeleny", "vysoky", 2.0, 12.0); 
 
    System.out.println("informace pro t1: "); 
    t1.showStyle(); 
    t1.showDim(); 
    t1.showBarva(); 
    System.out.println("Plocha = " + t1.area()); 
 
    System.out.println(); 
 
    System.out.println("informace pro t2: "); 
    t2.showStyle(); 
    t2.showDim(); 
    t2.showBarva(); 
    System.out.println("Plocha = " + t2.area()); 
  } 
}