circle.java

JSP课件以及一个网上书店系统程序,带数据库

package chap7.ex;
public class circle{
  int radius;
  public circle(){
  	radius=1;
  	}
  	public int getRadius(){
  		return radius;
  	}
  	public void setRadius(int newRadius){
  		radius=newRadius;
  	}
  	public double circleArea(){
  		return Math.PI*radius*radius;
  	}
  	public double circleLength(){
  		return 2.0*Math.PI*radius;
  	}
 }