immutablecircle.java

来自「Practical Java也是一本和J2ME手机游戏开发相关的书」· Java 代码 · 共 25 行

interface ImmutableCircle
{
  public double radius();
}

class MutableCircle implements ImmutableCircle
{
  private double radius;

  public MutableCircle(double r)
  {
    radius = r;
  }

  public void setRadius(double r)
  {
    radius = r;
  }

  public double radius()
  {
    return radius;
  }
  //...
}