Geometry.java
public abstract class Geometry{
public abstract double getArea();
}
TotalArea.java
public class TotalArea {
Geometry[]tuxing;
double totalArea=0;
public void setTuxing(Geometry[]t) {
tuxing=t;
}
public double computerTotalArea() {
for(int i=0;i
totalArea=totalArea+tuxing[i].getArea();
}
return totalArea;
}
}
Rect.java
public class Rect extends Geometry{
double a,b;
Rect(double a,double b){
this.a=a;
this.b=b;
}
public double getArea() {
return a*b;
}
}
Circle.java
public class Circle extends Geometry{
double r;
Circle(double r){
this.r=r;
}
public double gerArea(){
return 3.14*r*r;
}
}
MainClass.java
public class MainClass {
public static void main(String[] args) {
Geometry[]tuxing=new Geometry[29];
for(int i=0;i
if(i%2==0)
tuxing[i]=new Rect(16+i,68);
else if(i%2==1)
tuxing[i]=new Circle(10+i);
}
TotalArea computer=new TotalArea();
computer.setTuxing(tuxing);
System.out.printf("各种图形面积之和：n%f",computer.computerTotalArea());
}
}
