- public class Ch77
- {
- public static void main(String[] args)
- {
- Square sq=new Square("方形1號","綠色",5);
- sq.showName();
- sq.showColor();
- sq.calArea();
- Tri tr=new Tri("三角形1號","粉紅色",7,5);
- tr.showName();
- tr.showColor();
- tr.calArea();
- }
- }
- abstract class Shape
- {
- String name, color;
- Shape(String name, String color)
- {
- this.name=name;
- this.color=color;
- }
- void showName()
- {
- System.out.println("物件名稱: "+name);
- }
- void showColor()
- {
- System.out.println("顏色為: "+color);
- }
- abstract void calArea();
- }
- class Square extends Shape
- {
- int x;
- Square(String name, String color, int x)
- {
- super(name,color);
- this.x=x;
- }
- void calArea()
- {
- System.out.println("面積為: "+x*x+"平方公分");
- }
- }
- class Tri extends Shape
- {
- double x, y;
- Tri(String name, String color, double x, double y)
- {
- super(name,color);
- this.x=x;
- this.y=y;
- }
- void calArea()
- {
- System.out.println("面積為: "+(x*y/2)+"平方公分");
- }
- }
複製代碼 |