请前辈指点课本题，小游戏一共2个类，初始化对象指对象，对象又指对象
本帖最后由 wow7jiao 于 2018-12-17 14:07 编辑package castle;
import java.util.Scanner;
public class Game {
private Room currentRoom;
public Game()
{
createRooms();
}
private void createRooms()
{
Room outside, lobby, pub, study, bedroom;//-------------------------------------------->请问这些本地变量是不是出了构造函数就没有了？
// 制造房间
outside = new Room("城堡外");
lobby = new Room("大堂");
pub = new Room("小酒吧");
study = new Room("书房");
bedroom = new Room("卧室");
// 初始化房间的出口
outside.setExits(null, lobby, study, pub);//------>这里本地变量初始化有先后顺序要求？
lobby.setExits(null, null, null, outside);//
pub.setExits(null, outside, null, null);//
study.setExits(outside, bedroom, null, null);//
bedroom.setExits(null, null, null, study);//
currentRoom = outside;// 从城堡门外开始-------------------上面的本地变量lobby，pub，study，bedroom是不是相互之间setExits，被成员变量currentRoom揉合在一起，其实最后只初始化了currentRoom。这个outside指向study（Room），study又指向benroom（Room），
}
private void printWelcome() {
System.out.println();
System.out.println("欢迎来到城堡！");
System.out.println("这是一个超级无聊的游戏。");
System.out.println("如果需要帮助，请输入 'help' 。");
System.out.println();
System.out.println("现在你在" + currentRoom);
System.out.print("出口有：");
if(currentRoom.northExit != null)
System.out.print("north ");
if(currentRoom.eastExit != null)
System.out.print("east ");
if(currentRoom.southExit != null)
System.out.print("south ");
if(currentRoom.westExit != null)
System.out.print("west ");
System.out.println();
}
// 以下为用户命令
private void printHelp()
{
System.out.print("迷路了吗？你可以做的命令有：go bye help");
System.out.println("如：\tgo east");
}
private void goRoom(String direction)
{
Room nextRoom = null;
if(direction.equals("north")) {
nextRoom = currentRoom.northExit;
}
if(direction.equals("east")) {
nextRoom = currentRoom.eastExit;
}
if(direction.equals("south")) {
nextRoom = currentRoom.southExit;
}
if(direction.equals("west")) {
nextRoom = currentRoom.westExit;
}
if (nextRoom == null) {
System.out.println("那里没有门！");
}
else {
currentRoom = nextRoom;
System.out.println("你在" + currentRoom);
System.out.print("出口有: ");
if(currentRoom.northExit != null)
System.out.print("north ");
if(currentRoom.eastExit != null)
System.out.print("east ");
if(currentRoom.southExit != null)
System.out.print("south ");
if(currentRoom.westExit != null)
System.out.print("west ");
System.out.println();
}
}
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
Game game = new Game();
game.printWelcome();
while ( true ) {
String line = in.nextLine();
String[] words = line.split(" ");
if ( words.equals("help") ) {
game.printHelp();
} else if (words.equals("go") ) {
game.goRoom(words);
} else if ( words.equals("bye") ) {
break;
}
}
System.out.println("感谢您的光临。再见！");
in.close();
}
} 请问这些本地变量是不是出了构造函数就没有了？
是的。
这里本地变量初始化有先后顺序要求？
我觉得没有。方法调用顺序随便
从城堡门外开始-------------------上面的本地变量lobby，pub，study，bedroom是不是相互之间setExits，被成员变量currentRoom揉合在一起，其实最后只初始化了currentRoom。这个outside指向study（Room），study又指向benroom（Room）
是的，不然对象会被回收 package castle;
public class Room {
public String description;
public Room northExit;
public Room southExit;
public Room eastExit;
public Room westExit;
public Room(String description)
{
this.description = description;
}
public void setExits(Room north, Room east, Room south, Room west)
{
if(north != null)
northExit = north;
if(east != null)
eastExit = east;
if(south != null)
southExit = south;
if(west != null)
westExit = west;
}
@Override
public String toString()
{
return description;
}
}
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