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軟件設(shè)計(jì)師案例分析每日一練試題內(nèi)容（2024/11/27）

試題七
閱讀以下說明以及Java程序。
【說明】
傳輸門是傳輸系統(tǒng)中的重要裝置。傳輸門具有Open(打開)、Closed(關(guān)閉)、Opening (正在打開)、StayOpen(保持打開)和Closing(正在關(guān)閉)五種狀態(tài)。觸發(fā)狀態(tài)的轉(zhuǎn)換事件有click、complete和timeout三種。事件與其相應(yīng)的狀態(tài)轉(zhuǎn)換如下圖所示。

下面的Java代碼1與Java代碼2分別用兩種不同的設(shè)計(jì)思路對(duì)傳輸門進(jìn)行狀態(tài)模擬，請(qǐng)?zhí)钛a(bǔ)代碼中的空缺。
【Java代碼1】
public class Door {
public static final int CLOSED = 1；    public static final int OPENING = 2；
public static final int OPEN = 3；  public static final int CLOSING = 4；
public static final int STAYOPEN = 5；  private int state = CLOSED；
//定義狀態(tài)變量，用不同的整數(shù)表示不同狀態(tài)
private void setState(int state){ this.state = state；}
//設(shè)置傳輸門當(dāng)前狀態(tài)
public void getState() {
//此處代碼省略，本方法輸出狀態(tài)字符串，
//例如，當(dāng)前狀態(tài)為CLOSED時(shí)，輸出字符串為"CLOSED"
}
public void click()  {  //發(fā)生click事件時(shí)進(jìn)行狀態(tài)轉(zhuǎn)換
if (  (1)  ；)    setState(OPENING.；
else if (  (2)  ；)  setState{CLOSING.；
else if (  (3)  ；)    setState(STAYOPEN)；
}
//發(fā)生timeout事件時(shí)進(jìn)行狀態(tài)轉(zhuǎn)換
public void timeout() { if (state == OPEN)    setState(CLOSING.；}
public void complete() {//發(fā)生complete事件時(shí)進(jìn)行狀態(tài)轉(zhuǎn)換
if (state == OPENING.    setState(OPEN)；
else if  (state == CLOSING.  setState(CLOSED.；
}
public static void main(String [] args){
Door aDoor = new Door()；
aDoor.getState()；aDoor.click()；aDoor.getState()；aDoor.complete()；
aDoor.getState()；aDoor.click()；aDoor.getState()；aDoor.click()；
aDoor.getState()；return；
}
}
【Java代碼2】
public class Door {
public final DoorState CLOSED = new DoorClosed(this)；
public final DoorState OPENING = new DoorOpening(this)；
public final DoorState OPEN = new DoorOpen(this)；
public final DoorState CLOSING = new DoorClosing(this)；
public final DoorState STAYOPEN = new DoorStayOpen(this)；
private DoorState state = CLOSED；
//設(shè)置傳輸門當(dāng)前狀態(tài)
public void setState(DoorState state) { this.state=state；}
public void getState(){ //根據(jù)當(dāng)前狀態(tài)輸出對(duì)應(yīng)的狀態(tài)字符串
System.out.println(state.getClass().getName())；
}
public void click(){  (4)  ；}//發(fā)生click事件時(shí)進(jìn)行狀態(tài)轉(zhuǎn)換
public void timeout(){  (5)  ；}//發(fā)生timeout事件時(shí)進(jìn)行狀態(tài)轉(zhuǎn)換
public void complete(){  (6)  ；)//發(fā)生complete事件時(shí)進(jìn)行狀態(tài)轉(zhuǎn)換
public static void main(String[]args){
Door aDoor = new Door()；
aDoor.getState()；aDoor.click()；aDoor.getState()；aDoor.complete()；
aDoor.getState()；aDoor.timeout()；aDoor.getState()；return；
}
}
public abstract class DoorState { //定義所有狀態(tài)類的基類
protected Door door ；
public DoorState(Door doer)  { this.door = door；}
public void click() {}
public void complete() {}
public void timeout() {}
}
class DoorClosed extends DoorState { //定義一個(gè)基本的Closed狀態(tài)
public DoorClosed(Door door) { super(door)；}
public void click() {  (7)  ；)
//該類定義的其余代碼省略
}
//其余代碼省略

信管網(wǎng)cnit**************：
getstate（）==“opening”＜br＞getstate（）==“closing”＜br＞getstate（）==“stayopen”＜br＞

信管網(wǎng)cnit**************：
1 state==closing || state==xlosed＜br＞2 state==stay open || state==opening＜br＞3 state==open＜br＞4 state.click（）＜br＞5 state.tineout（）＜br＞6 state.complete（）＜br＞7 ＜br＞