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public class Test {
public static void main(String[] args) {
Circle c1=new Circle();
c1.setRadius(5);
Circle c2=new Circle();
c2.setRadius(3);
Circle c3=new Circle();
c3.setRadius(6);
Circle c4=new Circle();
c4.setRadius(2);
Circle c5=new Circle();
c5.setRadius(7);
Circle [] circles=new Circle[5];
circles[0]=c1;
circles[1]=c2;
circles[2]=c3;
circles[3]=c4;
circles[4]=c5;
for(int i=0;i<circles.length;i++){
Circle c= circles;
System.out.println("第"+(i+1)+"个圆:");
double a=c.getArea();//面积
double p=c.getPeremeter();//周长
System.out.println("面积:"+a);
System.out.println("周长:"+p);
}
}
}
class Circle {
double PAI = Math.PI;
private double radius;
public void setRadius(float radius) {
if(radius>0){
this.radius = radius;
}else{
System.out.println("半径值不能小于0");
}
}
//面积
public double getArea() {
return PAI * radius * radius;
}
//周长
public double getPeremeter() {
return 2 * PAI * radius;
}
}
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