本帖最後由 王秉鈞 於 2022-9-17 20:55 編輯
- public abstract class Ch34 {
- public static void main(String[] args) {
- Square q1=new Square("方形1號","綠色",5);
- q1.showName();
- q1.showColor();
- q1.calArea();
- Tri t1=new Square("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 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 s,String c,double x,double y)
- {
- super(s,c);
- this.x=x;
- this.y=y;
- }
- void calArea()
- {
- System.out.println("面積為"+(x*y/2)+"平方公分");
- }
- }
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