鐘舵佹ā寮忕殑UML鍥懼涓嬶細
鏄熼檯涓漢鏃忕殑鏈烘灙鍏礛arine鏈変袱縐嶇姸鎬侊細鏅氱姸鎬佸拰鎵撲簡鍏村閽堝悗鐨勭姸鎬侊紝涓ょ鐘舵佷笅鏈烘灙鍏電殑寮鏋鐜囨槸涓嶅悓鐨勶紝鎴戜滑鐢ㄧ姸鎬佹ā寮忔潵瀹炵幇鏈烘灙鍏電殑fire()鏂規硶銆?BR>
棣栧厛瀹氫箟鎶借薄鐘舵丼tate鎺ュ彛錛岃繖涓帴鍙ｆ寚瀹氫簡鏈烘灙鍏電殑fire琛屼負錛?BR>
public interface State {
public void fire();
}
State鎺ュ彛鏈変竴涓猣ire()鏂規硶錛屾垜浠疄鐜頒袱涓瓙綾籒ormalState鍜孍xcitedState錛屽垎鍒〃紺烘櫘閫氱姸鎬佸拰鎵撲簡鍏村閽堝悗鐨勭姸鎬侊紝騫跺疄鐜板叿浣撶殑fire鏂規硶錛?BR>
public class NormalState implements State {
public void fire() {
System.out.println("鏅氱姸鎬佹瘡縐掑紑鏋?嬈°?);
}
}
public class ExcitedState implements State {
public void fire() {
System.out.println("鍏村鐘舵佹瘡縐掑紑鏋?嬈°?);
}
}
鏈鍚庯紝瀹氫箟鏈烘灙鍏電被Marine錛屾瘡涓狹arine鐨勫疄渚嬩唬琛ㄤ竴涓満鏋叺錛?BR>
public class Marine {
// 淇濇寔涓涓姸鎬佺被鐨勫疄渚嬶細
private State state = new NormalState();
// 涓烘満鏋叺璁劇疆鐘舵侊細
public void setState(State state) {
this.state = state;
}
// fire()鏂規硶錛屽疄闄呰皟鐢ㄧ殑鏄痵tate鍙橀噺鐨刦ire()鏂規硶錛?BR> public void fire() {
state.fire();
}
}
鏈鍚庢垜浠湅鐪嬪浣曞湪瀹㈡埛绔帶鍒朵竴涓満鏋叺鐨勭姸鎬侊細
public static void main(String[] args) {
// 鍒涘緩涓涓満鏋叺鐨勫疄渚嬶細
Marine marine = new Marine();
// 璋冪敤fire()鏂規硶錛?BR> marine.fire();
// 璁劇疆涓哄叴濂嬬姸鎬侊細
marine.setState(new ExcitedState());
// 鍐嶈皟鐢╢ire()鏂規硶錛?BR> marine.fire();
}
瀵瑰悓涓涓狹arine瀵硅薄璋冪敤涓ゆfire()鏂規硶錛屽睆騫曡緭鍑轟負錛?BR>
鏅氱姸鎬佹瘡縐掑紑鏋?嬈°?BR>鍏村鐘舵佹瘡縐掑紑鏋?嬈°?/FONT>
鍙鏈烘灙鍏靛湪涓ょ鐘舵佷笅鐨勫悓涓涓猣ire()鏂規硶鏈変笉鍚岀殑琛屼負銆?BR>
浣跨敤鐘舵佹ā寮忕殑濂藉鏄瘡涓姸鎬佽灝佽鍒頒竴涓嫭绔嬬殑綾諱腑錛岃繖浜涚被鍙互鐙珛鍙樺寲錛岃屼富瀵硅薄涓病鏈夌箒鐞愮殑swich-case璇彞錛屽茍涓旀坊鍔犳柊鐨勭姸鎬侀潪甯稿鏄擄紝鍙渶瑕佷粠State媧劇敓涓涓柊綾誨嵆鍙?BR>
錛堝弬鑰冿細Design Patterns錛?/FONT>
Xuefeng's Weblog 2005-12-02 10:32 鍙戣〃璇勮
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