testgeometricobject.java

这是一个对属性

package counttest;

public class TestGeometricObject {
  /** Main method */
  public static void main(String[] args) {
    // Declare and initialize two geometric objects
    GeometricObject geoObject1 = new Circle(5);
    GeometricObject geoObject2 = new Rectangle(5, 3);
    //三角形
    GeometricObject geoObject3=new Triangle(1,1.5,1);


    System.out.println("The two objects have the same area? " +
      equalArea(geoObject1, geoObject2));

    // Display circle
    displayGeometricObject(geoObject1);

    // Display rectangle
    displayGeometricObject(geoObject2);

    //Display Triangle
    displayGeometricObject(geoObject3);
    //设置三角形的 颜色
    geoObject3.setColor("yellow");
    System.out.println("Triangle 的颜色："+geoObject3.getColor());
  }

  /** A method for comparing the areas of two geometric objects */
  public static boolean equalArea(GeometricObject object1,
    GeometricObject object2) {
    return object1.findArea() == object2.findArea();
  }

  /** A method for displaying a geometric object */
  //这个方法很关键  是一个很好的封装数据的 方法 我以前没有用过 要好好的掌握（继承）
  public static void displayGeometricObject(GeometricObject object) {
    System.out.println();
    System.out.println(object.toString());
    System.out.println("The area is " + object.findArea());
    System.out.println("The perimeter is " + object.findPerimeter());
  }


}