为什么android中parcelable的实现需要CREATOR

在查看parcelable的使用使用方法时有提到，实现parcelable的类必须有一个静态域CREATOR 实现creator<T>接口，但是并未说明为什么，代码查看在java FW层也查看不到其使用的地方，但是比较困惑，今天在重温java编程思想的时候，看到一个例子，豁然开朗，废话不多说，上代码：package designandpatternTest;

/**
* This class is written for the example to illustrate the interface and the
* innerclass, and how to use the Factory pattern, and it may reveal why the
* parcelable in the android must have a CREATOR static field
*
* see how the FACTORY field works just like the parcelabel CREATOR field in the android.
*
* @author bdgong
*
*/

interface Game {
boolean move();
}

interface GameFactory {
Game getGame();
}

class Checkers implements Game {

private Checkers() {
}

private int moves = 0;
private static final int MOVES = 3;

public boolean move() {
System.out.println("Checkers move " + moves);
return ++moves != MOVES;
}

public static final GameFactory FACTORY = new GameFactory() {

public Game getGame() {
return new Checkers();
}
};
}

class Chess implements Game {
private Chess() {
}

private int moves = 0;
private static final int MOVES = 4;

public boolean move() {
System.out.println("Chess move " + moves);
return ++moves != MOVES;
}

public static final GameFactory FACTORY = new GameFactory() {

public Game getGame() {
return new Chess();
}
};

}

public class InnerClassForFactory {

static void playGame(GameFactory factory) {
Game s = factory.getGame();
while (s.move());
}

public static void main(String[] args) {
playGame(Checkers.FACTORY);
playGame(Chess.FACTORY);
}
}以上FACTORY的使用应该可以揭示CREATOR的使用，这也是工厂方法的一个典型使用方式。
以记之。