JAVA上机实验求圆的面积和周长 第3页

 

    public Rectangle(double value) {

       this(value, value);

    }

 

    public Rectangle(double length, double width) {

       this.length = length;

       this.width = width;

    }

 

    @Override

    public String toString() {

       return "My real Class is:" + Rectangle.class.getName()

              + "\nMy length is:" + length + "\nMy width is:" + width

              + "\nMy area is:" + area() + "\nMy perimeter is:" + perimeter();

    }

 

    @Override

    public double area() {

       return length * width;

    }

 

    @Override

    public double perimeter() {

       return 2 * (length + width);

    }

 

    @Override

    public void draw() {

       Logger logger = Logger.getLogger("INFO");

       logger.info("draw()");

       System.out.println(message());

    }

 

    public double getLength() {

       return length;

    }

 

    public void setLength(double length) {

       this.length = length;

    }

 

    public double getWidth() {

       return width;

    }

 

    public void setWidth(double width) {

       this.width = width;

    }

 

}

 

package fox.math.kmust;

 

/**

 * @file Test.java

 */

public final class Test {

    public static void main(String[] args) {

       Shape shape = null;

       shape = new Circle();

       getShapeData(shape);

       if (Graph.class.isInstance(shape)) {

           drawGraph((Graph) shape);

       }

       System.out.println("-----The Line For Fox" + "-----TLFF-----"

              + "The Line For Fox-----");

       shape = new Rectangle(3.0);

       getShapeData(shape);

       if (Graph.class.isInstance(shape)) {

           drawGraph((Graph) shape);

       }

    }

 

    private static void getShapeData(Shape shape) {

       System.out.println("area:" + shape.area());

       System.out.println("perimeter:" + shape.perimeter());

    }

 

    private static void drawGraph(Graph graph) {

       graph.draw();

    }

} 

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