软件设计师下午试题每日一练(21)

软件设计师 责任编辑:胡媛 2018-11-07

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摘要:希赛网软考频道小编今天为大家准备了软件设计师下午试题每日一练(21),更多软件设计师下午试题请考生们关注希赛网软考频道。

阅读以下说明以及Java程序,将应填入 (n) 处的字句写在答题纸的对应栏内。
[说明]
传输门是传输系统中的重要装置。传输门具有Open(打开)、Closed(关闭)、Opening(正在打开)、StayOpen(保持打开)、Closing(正在关闭)五种状态。触发状态的转换事件有click、 complete和timeout三种。事件与其相应的状态转换如图7-1所示。



 下面的[Java代码1]与[Java代码2]分别用两种不同的设计思路对传输门进行状态模拟,请填补代码中的空缺。
[Java代码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:
//定义状态变量,用不同的整数表示不同状态

private void setState(int state){this.state = state;}//设置传输门当前状态
public void getState(){
//此处代码省略,本方法输出状态字符串,
//例如,当前状态为CLOSED时,输出字符串为"CLOSED"
}
public void click(){//发生click事件时进行状态转换
if( (1) )setState(OPENING);
else if( (2) )setState(CLOSING);
else if( (3) )setState(STAYOPEN);
}
//发生timeout事件时进行状态转换
public void timeout(){if(state == OPEN) setState(CLOSING);}
public void complete(){//发生complete 事件时进行状态转换
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.clik();
aDoor.getState();return;
}
}
[Java代码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 DoorStay0pen(this);
private DoorState state = CLOSED;

//设置传输门当前状态
public void setState(DoorState state){this.state = state;}
public void getState(){//根据当前状态输出对应的状态字符串
System.out?println(state.getClass().getName());
}
public void click(){ (4) ;}//发生click事件时进行状态转换
public void timeout(){ (5) ;}//发生timeout事件时进行状态转换
public void complete(){ (6) ;}//发生complete事件时进行状态转换

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{//定义所有状态类的基类
protected Door door:
public DoorState(Door door){this.door = door;}
public void click(){}
public void complete(){}
public void timeout(){}
}
class DoorClosed extends DoorState{//定义一个基本的Closed状态
public DoorClosed(Door door){super(door);}
public void click(){ (7) ;}
//该类定义的其余代码省略
}
//其余代码省略

 

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