icarnegieinfoapplication.java

SSD3 Practical quiz1

import  java.io.*;

/**
 * This class provides can get the information of Icarnegie
 *
 * @author  Guiming Lin
 * @version 1.0.1
 */
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);

	/**
     * ICarnegieInfoApplication presents the user with a menu of options, 
     * prompts the user for a choice, and processes the user's response
     *
     * @param args  not used
     * @throws IOException if error reading from standard input.
     */
	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());
			} else if (choice > 5)   {
				stdOut.println("Invalid choice: "+ choice);}

			choice = getChoice();
		}
	}
	
	/**
     * Tests method <code>readInteger</code>
     *
     * @param args  not used
     * @throws IOException if error reading from standard input.
     */
	private  static int  getChoice() throws IOException  {
		int number = 0;
		
		do  {            
                stdErr.println("[0] Quit");
                stdErr.println("[1] Display name");
                stdErr.println("[2] Display address");
                stdErr.println("[3] Display telephone");
                stdErr.println("[4] Display email");
                stdErr.println("[5] Display URL");
                stdErr.print("choice>");
                stdErr.flush();
            /*
             * try to get the number from the standard input,
             * and catch an exception if the user enters a choice that is not an integer
             */
            try  {
                number = Integer.parseInt(stdIn.readLine());
               
            }catch (NumberFormatException  nfe) {                
                stdErr.println(nfe);
                continue;
            }
            /*
             * If the user enters an integer outside of the valid range [0,5],
             *  an error message is displayed.
             */
            if(number>5||number<0){
            	  stdErr.println("Invalid input");
            	  continue;
            }else{
            	  return number;            	            	
            }
            
        }  while (true);
	}
}