/** Removes the axe owned from the player's inventory */
public void removeAxe() {
Sys.print("You have lost your " + axe.getName() + "!");
axe = null;
}
// 实现Person接口的useAxe方法
public void useAxe() {
// 调用axe的chop()方法，
// 表明Person对象依赖于axe对象
System.out.println(axe.chop());
System.out.println("age属性值：" + age);
}
/**
* Adds a specified axe to the player's inventory
*
* @param a - Specified axe
*/
public void addAxe(Axe a) {
Sys.print("You have obtained a " + a.getName() + "!");
axe = a;
}
