package 第6周;
import javax.swing.*;
import java.util.*;
public class 圆 {
double r,R,S;
private void setr(double newr) {
if(r>0) {
newr=R/2;
r=newr;
}
else
r=0;
}
private double getr() {
return r;
}
private void setR(double newR) {
if(R>0)
{
newR=r*2;
R=newR;
}
else
R=0;
}
private double getR() {
return R;
}
private double getS() {
return 3.14*r*r;
}
public static void main(String[] args) {
// TODO 自动生成的方法存根
圆 acircle=new 圆();
acircle.setr(10);
acircle.setR(30);
System.out.print("圆的半径为:"+acircle.getr()+"\n"+"圆的直径为:"+acircle.getR());
}
}