1. [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(~在关闭)5种状态。触发状态的转换事件有click、complete和timeout 3种。事件与其相应的状态转换如下图所示。
下面的Java程序1与Java程序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程序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 ______ setState (OPENING);
else if (______) setState (CLOSING);
else if (______state==OPEN_) 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. click( );
aDoor. getState( ); return;
}
}
[Java程序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;
//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( ) {______; } //发生click事件时进行状态转换
public void timeout( ) {______; } //发生timeout事件时进行状态转换
public void complete( ) {______; } //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( ) {______; }
//该类定义的其余代码省略
}
//其余代码省略
state==CLOSED||state==CLOSING
state==OPENING||state==STAYOPEN
state==OPEN
state.click( )
state.timeout( )
state.complete( )
door.setState(door.OPENING)
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