可以用接口实现：
public class FunctionPointerTest { public static void main(String... args){ Player[] players = new Player[5]; for(int i = 0;i 如果不用这种“函数指针”，以上代码就会是：
public class FunctionPointerTest { public static void main(String... args){ Player[] players = new Player[5]; for(int i = 0;i