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有關java的Static nested classes

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耒戈氏

發表於： Jul 3 2010, 15:18 　

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我看過Java tutorials，有關static nested class是這樣寫的:

QUOTE

Static Nested Classes

As with class methods and variables, a static nested class is associated with its outer class. And like static class methods, a static nested class cannot refer directly to instance variables or methods defined in its enclosing class — it can use them only through an object reference.
Note: A static nested class interacts with the instance members of its outer class (and other classes) just like any other top-level class. In effect, a static nested class is behaviorally a top-level class that has been nested in another top-level class for packaging convenience.

照我的理解，Static Nested Classes好像一般的top-level class的話，應該是不能夠存取superclass裏面的private field嘛，但是下面的代碼運行時沒有問題...

CODE

public class Player implements Comparable, Cloneable {
...
private int hp, atk, def, spd, mor;
...
private static class RandomEvent {
...
public RandomEventResult execute(Player p1, Player p2, int n){
...
Player affectedPlayer = n == 1 ? p1 : p2;
...
int tp = affectedPlayer.hp;
affectedPlayer.hp = (int) (affectedPlayer.hp * (1 + actualAffectRate) + actualAffectValue);
//static nested class直接存取superclass的private field hp

這裡我覺得有點困擾，所以想問究竟我上面的寫法有沒什麼危機，還有有關static nested class的詳細

本篇文章已被 耒戈氏 於 Jul 3 2010, 15:22 編輯過

參謀ABC	發表於： Jul 3 2010, 17:01 　評價：+1
神隱之主犯-永遠與須臾之罪人發表數： 3,458 所屬群組：太守註冊日期： 9-18-2003 活躍：15 聲望：1860	outer class=/=super class

高長恭

發表於： Jul 4 2010, 06:49 　評價：+1

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Nested Class 就是能夠直接存取 Enclosing Class (Outer Class) 的任何members，包括private members。

QUOTE

As with class methods and variables, a static nested class is associated with its outer class. And like static class methods, a static nested class cannot refer directly to instance variables or methods defined in its enclosing class — it can use them only through an object reference.

是指Nested Static Class只可以透過object reference存取Enclosing Class的members。

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