pets.java

来自「think in java TIJ-3rd-edition-code.zip」· Java 代码 · 共 12 行

//: c12:Pets.java
package c12;

class Pet {}
class Dog extends Pet {}
class Pug extends Dog {}
class Cat extends Pet {}
class Rodent extends Pet {}
class Gerbil extends Rodent {}
class Hamster extends Rodent {}

class Counter { int i; } ///:~