public class shape
{
static final double pi = 3.14;
double length;
double area;
public double length(){
return 0;
}
public double area(){
return 0;
}
}
public class circle extends shape{
private double a;
public circle(double r){
a = r;
}
public double geta(){
return a;
}
public void seta(double a){
this.a = a;
}
@Override
public double length(){
return 2*pi*a;
}
@Override
public double area(){
return pi*a*a;
}
}
public class rectangle extends shape{
private int m;
private int n;
public rectangle(int m,int n){
this.m = m;
this.n = n;
}
public int getm(){
return m;
}
public void setm(int m){
this.m = m;
}
public int getn(){
return n;
}
public void setn(int n){
this.n = n;
}
@Override
public double length(){
return 2*(m+n);
}
@Override
public double area(){
return m*n;
}
}
package shape;
import shape.shape;
import shape.circle;
import shape.rectangle;
import java.util.Scanner;
public class test {
public static void main(String arg[]){
shape[] shapes=new shape[2];
Scanner sc=new Scanner(System.in);
System.out.println("请输入矩形的长和宽");
int m=sc.nextInt();
int n=sc.nextInt();
shapes[0]=new rectangle(m,n);
System.out.print("矩形的周长为："+shapes[0].length);
System.out.print("矩形的面积为："+shapes[0].area);
Scanner sd=new Scanner(System.in);
System.out.println("请输入圆的半径");
float r=sd.nextFloat();
shapes[1]=new circle(r);
System.out.print("圆的周长为："+shapes[1].length);
System.out.print("圆的面积为："+shapes[1].area);
}
}
结果：请输入矩形的长和宽
1
1
矩形的周长为：0.0矩形的面积为：0.0请输入圆的半径
1
圆的周长为：0.0圆的面积为：0.0
