test.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 20 行

class Base
{
  public boolean equals(Object obj)
  {
    if (obj instanceof Base)
      //...
  }
}

class Derived extends Base
{
  public boolean equals(Object obj)
  {
    if (obj instanceof Derived)
    //...
  }
}

Base b = new Base();
Derived d = new Derived();