创建名为CompareableRectangle的类

显示全部楼层 · 2010-6-13 23:51:44

创建名为CompareableRectangle的类，它扩展Rectangle类并实现Compareable接口。画出UML图并实现compareTo方法，使其根据面积比较两个矩形。编写测试程序找出两个CompareableRectangle对象的实例中的较大者。
Rectangle类如下：
public class Rectangle extends GeometricObject {
private double width;
private double height;
public Rectangle() {
}
public Rectangle(double width, double height) {

this.width = width;

this.height = height;
}
/** Return width */
public double getWidth() {

return width;
}
/** Set a new width */
public void setWidth(double width) {

this.width = width;
}
/** Return height */
public double getHeight() {

return height;
}
/** Set a new height */
public void setHeight(double height) {

this.height = height;
}
/** Return area */
public double getArea() {

return width * height;
}
/** Return perimeter */
public double getPerimeter() {

return 2 * (width + height);
}
}

千问 · 2010-6-13 23:51:44

class CompareableRectangle extends Rectangle implements Comparable{public CompareableRectangle() { super();}public CompareableRectangle(double width, double height) { super(width, height);} public int compareTo(Rectangle o){return getArea() - o.getArea();; }}