circle.java

来自「java的小程序」· Java 代码 · 共 46 行

public class Circle
{
  protected double radius;

  public Circle()
  {
    this(1.0);
  }

  public Circle(double radius)
  {
    this.radius = radius;
  }

  public double getRadius()
  {
    return radius;
  }

  public void setRadius(double radius)
  {
    this.radius = radius;
  }

  public double findArea()
  {
    return radius*radius*Math.PI;
  }

  public double findPerimeter()
  {
    return 2*radius*Math.PI;
  }

  public boolean equals(Circle circle)
  {
    return this.radius == circle.getRadius();
  }
  public String toString()
  {
    return "[Circle] radius = " + radius;
  }
}