catsanddogs.java

经典java书籍《thinking in java（第三版）》的源码

//: c11:CatsAndDogs.java
// Simple container example.
// {ThrowsException}
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
package c11;
import java.util.*;

public class CatsAndDogs {
  public static void main(String[] args) {
    List cats = new ArrayList();
    for(int i = 0; i < 7; i++)
      cats.add(new Cat(i));
    // Not a problem to add a dog to cats:
    cats.add(new Dog(7));
    for(int i = 0; i < cats.size(); i++)
      ((Cat)cats.get(i)).id();
      // Dog is detected only at run time
  }
} ///:~