※ 引述《cscfish (雙棲動物)》之銘言：
> ※ 引述《cscfish (雙棲動物)》之銘言：
> > 就是為啥我計算出的數字都會是0 是哪要改嗎
> > 還有說要用多形和超載 那應該超載已經合多型條件了吧
> > 如果不合條件 那要怎麼改才可以呢
> > 因為getarea() 同時有計triangle circle rectangle的不同功能(多形)
> > class shape {
> > private double area,circum;
> > shape(double a,double b)
> > {
> > this.area=a;
> > this.circum=b;
> > }
> > public double getarea(){return area;}
> > double getcircum(){return circum;}
> > }
> > =====================================================
> > class circle extends shape {
> > private double r;
> > circle(double r)
> > {super(r,r);}
> > public double getarea(){return 3.14*r*r;}
> > public double getcircum(){return 6.28*r;};
> > }
> > =====================================================
> > class rectangle extends shape{
> > private double x,y;
> > rectangle(double x,double y)
> > {super(x,y);}
> > public double getarea(){return x*y;}
> > public double getcircum(){return 2*x+2*y;};
> > }
> > =====================================================
> > class triangle extends shape {
> > double s,t;
> > triangle(double s,double t)
> > { super(s,t);}
> > public double getarea(){return 0.5*s*t;}
> > public double getcircum(){return 3*s;};
> > }
> > =====================================================
> > public class calculate {
> > public static void main(String args[]){
> > circle cir=new circle(3);
> > triangle tri=new triangle(3,3);
> > rectangle rec=new rectangle(3,3);
> > System.out.print("\n" +cir.getarea());
> > System.out.print("\n" +cir.getcircum());
> > System.out.print("\n" +tri.getarea());
> > System.out.print("\n" +tri.getcircum());
> > System.out.print("\n" +rec.getarea());
> > System.out.print("\n" +rec.getcircum());
> > }
> > }
接著我要加一功能就是隨便選一個圖形 在計算其面積
我改這樣不行 不知哪位大大可以在幫指點一下
class calculate {
public static void main(String args[]){
System.out.print("input integer of n");
int n=Integer.parseInt(keyin.readLine());//讀取輸入並存取n變數
//int circle=1,rectangle=2,triangle=3;
int create(n)
{
switch(n)
{
case 1:
System.out.print("\n" +cir.getarea(3));
System.out.print("\n" +cir.getcircum(3));
case 2:
System.out.print("\n" +tri.getarea(3,3));
System.out.print("\n" +tri.getcircum(3,3));
case 3:
System.out.print("\n" +rec.getarea(3,3));
System.out.print("\n" +rec.getcircum(3,3));
}
}
}
}
--
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