Prototype妯″紡鍏佽涓€涓璞″啀鍒涘緩鍙﹀涓€涓彲瀹氬埗鐨勫璞★紝鏍規湰鏃犻渶鐭ラ亾浠諱綍濡備綍鍒涘緩鐨勭粏鑺?宸ヤ綔鍘熺悊鏄?閫氳繃灝嗕竴涓師鍨嬪璞′紶緇欓偅涓鍙戝姩鍒涘緩鐨勫璞★紝榪欎釜瑕佸彂鍔ㄥ垱寤虹殑瀵硅薄閫氳繃璇鋒眰鍘熷瀷瀵硅薄鎷瘋礉瀹冧滑鑷繁鏉ュ疄鏂藉垱寤恒€?/p>

濡備綍浣跨敤?
鍥犱負Java涓殑鎻愪緵clone()鏂規硶鏉ュ疄鐜板璞＄殑鍏嬮殕,鎵€浠rototype妯″紡瀹炵幇涓€涓嬪瓙鍙樺緱寰堢畝鍗?

浠ュ嫼瀛愪負渚嬶細

鏈変釜鍏蜂綋瀹炵幇(ConcretePrototype):

璋冪敤Prototype妯″紡寰堢畝鍗?

AbstractSpoon spoon = new SoupSpoon();
AbstractSpoon spoon2 = spoon.clone();

褰撶劧涔熷彲浠ョ粨鍚堝伐鍘傛ā寮忔潵鍒涘緩AbstractSpoon瀹炰緥銆?/p>

鍦↗ava涓璓rototype妯″紡鍙樻垚clone()鏂規硶鐨勪嬌鐢紝鐢變簬Java鐨勭函媧佺殑闈㈠悜瀵硅薄鐗規€э紝浣垮緱鍦↗ava涓嬌鐢ㄨ璁℃ā寮忓彉寰楀緢鑷劧錛屼袱鑰呭凡緇忓嚑涔庢槸嫻戠劧涓€浣撲簡銆傝繖鍙嶆槧鍦ㄥ緢澶氭ā寮忎笂錛屽Interator閬嶅巻妯″紡銆?/p>

public class IntegerAdder implements Observer {

private IntegerDataBag bag;

public IntegerAdder( IntegerDataBag bag ) {
this.bag = bag;
bag.addObserver( this );
}

public void update( Subject o ) {
if( o == bag ) {
System.out.println( "The contents of the IntegerDataBag have changed." );
int counter = 0;
Iterator i = bag.iterator();
while( i.hasNext() ) {
Integer integer = ( Integer ) i.next();
counter+=integer.intValue();
}
System.out.println( "The new sum of the integers is: " + counter );
}
}

}

import java.util.Iterator;

public class IntegerPrinter implements Observer {

private IntegerDataBag bag;

public IntegerPrinter( IntegerDataBag bag ) {
this.bag = bag;
bag.addObserver( this );
}

public void update( Subject o ) {
if( o == bag ) {
System.out.println( "The contents of the IntegerDataBag have changed." );
System.out.println( "The new contents of the IntegerDataBag contains:" );
Iterator i = bag.iterator();
while( i.hasNext() ) {
System.out.println( i.next() );
}
}
}

}

IntegerAdder鍜孖ntegerPrinter灝嗚嚜宸變綔涓鴻瀵熻€呭鍔犲埌IntegerDataBag銆傚綋IntegerAdder鎺ユ敹鍒頒竴鏉℃洿鏂版秷鎭椂錛屽畠鍏堢粺璁ag涓殑鎬繪暟錛岀劧鍚庢樉紺虹粨鏋溿€傚悓鏍鳳紝褰揑ntegerPrinter鎺ユ敹鍒頒竴鏉℃洿鏂版秷鎭椂錛屽畠鎵撳嵃鍑篵ag涓殑Interger銆?

涓嬮潰鏄竴涓畝鍗曠殑main()錛屽畠浣跨敤浜嗕笂闈㈢殑鍑犱釜綾伙細

public class Driver {
public static void main( String [] args ) {
Integer i1 = new Integer( 1 ); Integer i2 = new Integer( 2 );
Integer i3 = new Integer( 3 ); Integer i4 = new Integer( 4 );
Integer i5 = new Integer( 5 ); Integer i6 = new Integer( 6 );
Integer i7 = new Integer( 7 ); Integer i8 = new Integer( 8 );
Integer i9 = new Integer( 9 );

IntegerDataBag bag = new IntegerDataBag();
bag.add( i1 ); bag.add( i2 ); bag.add( i3 ); bag.add( i4 );
bag.add( i5 ); bag.add( i6 ); bag.add( i7 ); bag.add( i8 );

IntegerAdder adder = new IntegerAdder( bag );
IntegerPrinter printer = new IntegerPrinter( bag );

// adder and printer add themselves to the bag

System.out.println( "About to add another integer to the bag:" );
bag.add( i9 );
System.out.println("");
System.out.println("About to remove an integer from the bag:");
bag.remove( 0 );
}
}

榪愯main錛屼綘灝嗙湅鍒幫細

c:\javaworld\java Driver
About to add another integer to the bag:
The contents of the IntegerDataBag have changed.
The new sum of the intergers is: 45
The contents of the IntegerDataBag have changed.
The new contents of the IntegerDataBag contains:
1
2
3
4
5
6
7
8
9

About to remove an integer from the bag:
The contents of the IntegerDataBag have changed.
The new sum of the intergers is: 44
The contents of the IntegerDataBag have changed.
The new contents of the IntegerDataBag contains:
2
3
4
5
6
7
8
9

IntegerDataBag/IntegerAdder/IntegerPrinter鏄簲鐢∣bserver妯″紡鐨勪竴涓緢綆€鍗曠殑渚嬪瓙銆侸ava鏈韓鏈夊ぇ閲忎嬌鐢∣bserver妯″紡鐨勪緥瀛愶細AWT/Swing浜嬩歡妯″瀷錛岃繕鏈塲ava.util.Observer鍜宩ava.util.Observable鎺ュ彛絳夛紝閮芥槸寰堝ソ鐨勪緥瀛?br />

Stratrgy搴旂敤姣旇緝騫挎硾,姣斿, 鍏徃緇忚惀涓氬姟鍙樺寲鍥? 鍙兘鏈変袱縐嶅疄鐜版柟寮?涓€涓槸綰挎潯鏇茬嚎,涓€涓槸妗嗗浘(bar),榪欐槸涓ょ綆楁硶,鍙互浣跨敤Strategy瀹炵幇.

榪欓噷浠ュ瓧絎︿覆鏇夸唬涓轟緥, 鏈変竴涓枃浠?鎴戜滑闇€瑕佽鍙栧悗,甯屾湜鏇夸唬鍏朵腑鐩稿簲鐨勫彉閲?鐒跺悗杈撳嚭.鍏充簬鏇夸唬鍏朵腑鍙橀噺鐨勬柟娉曞彲鑳芥湁澶氱鏂規硶,榪欏彇鍐充簬鐢ㄦ埛鐨勮姹?鎵€浠ユ垜浠鍑嗗鍑犲鍙橀噺瀛楃鏇夸唬鏂規.

聽

棣栧厛,鎴戜滑寤虹珛涓€涓娊璞＄被RepTempRule 瀹氫箟涓€浜涘叕鐢ㄥ彉閲忓拰鏂規硶:

鍦≧epTempRule涓?鏈変竴涓娊璞℃柟娉昦bstract闇€瑕佺戶鎵挎槑紜?榪欎釜replace閲屽叾瀹炴槸鏇夸唬鐨勫叿浣撴柟娉?
鎴戜滑鐜板湪鏈変袱涓瓧絎︽浛浠ｆ柟妗?
1.灝嗘枃鏈腑aaa鏇夸唬鎴恇bb;
2.灝嗘枃鏈腑aaa鏇夸唬鎴恈cc;

瀵瑰簲鐨勭被鍒嗗埆鏄疪epTempRuleOne RepTempRuleTwo

絎簩姝ワ細鎴戜滑瑕佸緩绔嬩竴涓畻娉曡В鍐崇被錛岀敤鏉ユ彁渚涘鎴風鍙互鑷敱閫夋嫨綆楁硶銆?/p>

public class RepTempRuleSolve { 銆€銆€private RepTempRule strategy; 銆€銆€public RepTempRuleSolve(RepTempRule rule){ 銆€銆€銆€銆€this.strategy=rule; 銆€銆€} 銆€銆€public String getNewContext(Site site,String oldString) { 銆€銆€銆€銆€return strategy.replace(site,oldString); 銆€銆€} 銆€銆€public void changeAlgorithm(RepTempRule newAlgorithm) { 銆€銆€銆€銆€strategy = newAlgorithm; 銆€銆€} }

聽

聽

璋冪敤濡備笅:

鎴戜滑杈懼埌浜嗗湪榪愯鏈熼棿錛屽彲浠ヨ嚜鐢卞垏鎹㈢畻娉曠殑鐩殑銆?/p>

瀹為檯鏁翠釜Strategy鐨勬牳蹇冮儴鍒嗗氨鏄娊璞＄被鐨勪嬌鐢?浣跨敤Strategy妯″紡鍙互鍦ㄧ敤鎴烽渶瑕佸彉鍖栨椂,淇敼閲忓緢灝?鑰屼笖蹇€?

Strategy鍜孎actory鏈変竴瀹氱殑綾諱技,Strategy鐩稿綆€鍗曞鏄撶悊瑙?騫朵笖鍙互鍦ㄨ繍琛屾椂鍒昏嚜鐢卞垏鎹€€侳actory閲嶇偣鏄敤鏉ュ垱寤哄璞°€?/p>

Strategy閫傚悎涓嬪垪鍦哄悎:

1.浠ヤ笉鍚岀殑鏍煎紡淇濆瓨鏂囦歡;

2.浠ヤ笉鍚岀殑綆楁硶鍘嬬緝鏂囦歡;

3.浠ヤ笉鍚岀殑綆楁硶鎴幏鍥捐薄;

4.浠ヤ笉鍚岀殑鏍煎紡杈撳嚭鍚屾牱鏁版嵁鐨勫浘褰?姣斿鏇茬嚎 鎴栨鍥綽ar絳?/p>