ssd3：Practical Quiz 1 iCarnegie Information

iCarnegie Information

import  java.io.*;
import  java.util.*;

public class ICarnegieInfoApplication  {

 private static BufferedReader  stdIn =
  new  BufferedReader(new  InputStreamReader(System.in));
 private static PrintWriter  stdOut =
  new  PrintWriter(System.out, true);
 private static PrintWriter  stdErr =
  new  PrintWriter(System.err, true);

 public static void main(String[]  args) throws IOException  {

  ICarnegieInfo companyInfo = ICarnegieInfo.getInstance();

  int  choice = getChoice();

  while (choice != 0)  {

   if (choice == 1)  {
    stdOut.println(companyInfo.getName());
   } else if (choice == 2)  {
    stdOut.println(companyInfo.getAddress());
   } else if (choice == 3)  {
    stdOut.println(companyInfo.getTelephone());
   } else if (choice == 4)  {
    stdOut.println(companyInfo.getEmail());
   } else if (choice == 5)  {
    stdOut.println(companyInfo.getUrl());
   }

   choice = getChoice();
  }
 }

 private static int  getChoice() throws IOException  {

  /* Following is my code */
  String choice=stdIn.readLine();     //stdIn.read()只能读取单个字符
  try
  {
       int iChoice=Integer.parseInt(choice);
       return iChoice;
  }
  catch(NumberFormatException e)
  {
       stdErr.println("input error.Please input again");
       return -1;
  } 
 }
}

 

考察：

1.处理异常。输入输出异常以及数据类型异常。

2.ICarnegieInfo companyInfo = ICarnegieInfo.getInstance();

   单件模式(不能直接调用构造函数，该类只能创建一个实例)

   public class className  {

   private static className instance = NULL;

       ...

   private className(){...}   //非public的构造函数

   public static className getInstance()  {

   if(instance == NULL)

      instance = new className();

   return instance；     

   }