You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
27 lines
907 B
27 lines
907 B
/**
|
|
* 演示：多态 —— 同一 {@link ShapeUtil#printArea(Shape)} 处理圆、矩形、三角形。
|
|
* 运行：javac *.java 后执行 java ShapeCalculatorDemo
|
|
*/
|
|
public class ShapeCalculatorDemo {
|
|
|
|
public static void main(String[] args) {
|
|
Shape circle = new Circle(3.0);
|
|
Shape rectangle = new Rectangle(4.0, 5.0);
|
|
Shape triangle = new Triangle(6.0, 4.0);
|
|
|
|
System.out.println("—— 圆 ——");
|
|
ShapeUtil.printArea(circle);
|
|
|
|
System.out.println("—— 矩形 ——");
|
|
ShapeUtil.printArea(rectangle);
|
|
|
|
System.out.println("—— 三角形 ——");
|
|
ShapeUtil.printArea(triangle);
|
|
|
|
System.out.println("—— 多态数组统一处理 ——");
|
|
Shape[] shapes = {circle, rectangle, triangle};
|
|
for (Shape s : shapes) {
|
|
ShapeUtil.printArea(s);
|
|
}
|
|
}
|
|
}
|
|
|