- public class Ch01 {
- 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 color, name;
- 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 n, String c, int x) {
- super(n, c);
- 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 n, String c, double x, double y) {
- super(n, c);
- 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 |