interfaceref.java

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interface ActionList
{
  public abstract void fly();
  public abstract void swim();
}
interface AbilityList
{
  public abstract void read();
  public abstract void write();
}

class Hero implements ActionList,AbilityList
{
  public void fly()
  {
    System.out.println("fly!");
  }
  public void swim()
  {
    System.out.println("swim");
  }
  public void read()
  {
    System.out.println("read!");
  }
  public void write()
  {
    System.out.println("write!");
  }
}

class tester
{
  public static void main(String args[])
  {
    ActionList a1 = new Hero();
    a1.fly();
    // a1.read(); // 错误! 不能访问!
    AbilityList a2 = new Hero();
    a2.write();
    // a2.fly();  // 错误! 不能访问!
  }
}