[問題] 請問繼承抽象類別時...??
abstract class CShape{
protected String color;
public void setColor(String str){
color=str;
}
}
class CRectangle extends CShape{
protected int width,height;
public CRectangle(int w, int h){
width=w;
height=h;
}
public void show(){
System.out.print("color="+color);
System.out.println(", area="+width*height);
}
}
class CCircle extends CShape{
protected double radius;
public CCircle(double r){
radius=r;
}
public void show(){
System.out.print("color="+color);
System.out.println(", area="+3.14*radius*radius);
}
}
public class ex11_4{
public static void main(String[] args){
CRectangle rect = new CRectangle(5,10);
//當建立此建構元時，為何不用呼叫父類別(抽象類別的建構元)...
//能正確執行...??
rect.setColor("Yellow");
rect.show();
CCircle cir = new CCircle(2.0);
cir.setColor("Green");
cir.show();
}
}
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