Java开发网 - 一个简单问题

Topic: 一个简单问题

1.一个简单问题

Posted by: zyy266
Posted on: 2004-09-27 09:50

import java.io.*;
class Elevator{
  boolean running = true;
  void shutDown(){
    running = false;
  }
class FrontDesk{
  private final int EVENING = 8;
  Elevator NorthElevator, SouthElevator;

  FrontDesk() {
    NorthElevator = new Elevator();
    SouthElevator = new Elevator();
  }
  void maintenance(int time){
    if(time==EVENING)
      NorthElevator.shutDown();
    }


  void displayStatus(){
    System.out.print("North Elevator is ");
    if(!(NorthElevator.running))
      System.out.print("not");
    System.out.println("running.");
    System.out.print("South Elevator is ");
    if(!(SouthElevator.running))
      System.out.print("not");
    System.out.println("running.");
  }
}
}
public class Hotel{
  public static void main(String args[]){
    FrontDesk lobby;
    lobby = new FrontDesk();
    System.out.print("It's 7:00 tTime to check the ");
    lobby.maintenance(7);
    lobby.displayStatus();

    System.out.println();
    System.out.println("It's 8:00 Time to cheack the ");
    lobby.maintenance( 8 );
    lobby.displayStatus();
  }
}

这个程序编译出错
显示
D:\rabbit\java\exercise\Hotel.java:35: cannot resolve symbol
  symbol : class FrontDesk
location: class Hotel
   FrontDesk lobby;
^
D:\rabbit\java\exercise\Hotel.java:36: cannot resolve symbol
symbol : class FrontDesk
location: class Hotel
    lobby = new FrontDesk();

难道这里定义方法有错？

2.Re:一个简单问题 [Re: zyy266]	Copy to clipboard
Posted by: 极品飞车 Posted on: 2004-09-27 14:10 前面两个类不以}结束.

3.Re:一个简单问题 [Re: zyy266]	Copy to clipboard
Posted by: cjf_28040 Posted on: 2004-09-27 15:05 内嵌类的不能在类外被声明

4.Re:一个简单问题 [Re: zyy266]	Copy to clipboard
Posted by: zyy266 Posted on: 2004-09-28 09:38 不用{} 该用什么

5.Re:一个简单问题 [Re: zyy266]

Copy to clipboard

Posted by: gooood
Posted on: 2004-09-28 17:30

正确的写法应该为
import java.io.*;
class Elevator{
boolean running = true;
void shutDown(){
running = false;
}
}
class FrontDesk{
private final int EVENING = 8;
Elevator NorthElevator, SouthElevator;

FrontDesk() {
NorthElevator = new Elevator();
SouthElevator = new Elevator();
}
void maintenance(int time){
if(time==EVENING)
NorthElevator.shutDown();
}

void displayStatus(){
System.out.print("North Elevator is ");
if(!(NorthElevator.running))
System.out.print("not");
System.out.println("running.");
System.out.print("South Elevator is ");
if(!(SouthElevator.running))
System.out.print("not");
System.out.println("running.");
}
}

public class HotelElevator{
public static void main(String args[]){
FrontDesk lobby;
lobby = new FrontDesk();
System.out.print("It's 7:00 tTime to check the ");
lobby.maintenance(7);
lobby.displayStatus();

System.out.println();
System.out.println("It's 8:00 Time to cheack the ");
lobby.maintenance( 8 );
lobby.displayStatus();
}
}