Problème de compréhension d'une classe
bonsoir,
dans la classe suivante est ce que vous trouvez comment un object Request peut il être crée avec comme attribut code : code = NONE ?
Code:
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| package shiptrafficcontrol;
public class Request {
private Ship ship;
private int code;
public static final int LEAVE=0, DOCK=1, SET_SAIL=2, ARRIVE=3, NONE=4;
public Request(java.util.Random random, Cluster seaShips, Cluster waitingShips, Cluster dockShips){
int randCode;
Cluster cluster;
// pick a request with preference to docking from the queue
if (!waitingShips.isEmpty() && random.nextFloat()>0.5){
randCode = NONE;
ship = null;
} else {
randCode = random.nextInt(3);
// if there's no ship to go with the request
// then make the request be arrive with a new ship
// else pick a ship that could have made the request
cluster = workOutClusterFor(randCode, seaShips, dockShips);
if (cluster.isEmpty()) {
code = ARRIVE;
ship = new Ship();
} else {
code = randCode;
ship = (Ship) cluster.pickOne(random);
}
}
}
public static Cluster workOutClusterFor(int randCode, Cluster seaShips, Cluster dockShips){
/* @ requires: randCode == LEAVE || randCode == DOCK || randCode == SET_SAIL;
* @ ensures: \return != null
*/
if (randCode == LEAVE || randCode == DOCK)
return seaShips;
else
return dockShips;
}
public String toString(){
String message;
if (code==NONE)
return "-- no message --";
else {
switch (code){
case LEAVE: message = "Can I leave the area?"; break;
case DOCK: message = "Can I dock?"; break;
case SET_SAIL: message = "Can I set sail from the dock?"; break;
case ARRIVE: message = "Can I enter the area?"; break;
default: message = ""; break;
}
return "<"+ship.toString()+"> :"+message;
}
}
public Ship getShip(){
return ship;
}
public int getCode(){
return code;
}
} |
Parce que moi, je ne trouve pas:cry:
Merci:P
