Modify the above program so that it reads from the file FriendsPhones.txt, download the friends name into the friends array and corresponding phone number into an array called phoneNumbers. Upd

Question

Modify the above program so that it reads from the file FriendsPhones.txt,  download the friends name into the friends array and corresponding phone number into an array called phoneNumbers. 

Update the fillArray method to fill both arrays, update the findAFriend method to input the friends name and returns the phone number of the friend if the friend is found. Note both methods will input both the arrays as parameters.

So your output will look like this:

  

 

  

Answer 1

import java.io.*;

import java.util.Scanner;

class Friends

{

protected BufferedReader bufferedReader;

protected Scanner scanner;

public Friends()

{

try

{

bufferedReader = new BufferedReader( new FileReader("friends.txt"));

scanner = new Scanner(System.in);

}

catch (IOException ex)

{

System.out.println(" Error opening input file ");

bufferedReader = null;

}

}

//***** RETURNS THE # of FRIENDS IN THE FILE !!!!! *************/

protected int OpenFile()

{

int iNumFriendsReturn=-1;

if (bufferedReader!=null)

{

try

{

String inbuff = bufferedReader.readLine();

iNumFriendsReturn = Integer.parseInt(inbuff.trim());

}

catch (IOException ex)

{

iNumFriendsReturn=-1;

System.out.println(" Error reading input file ");

}

}

return(iNumFriendsReturn);

}

protected int fillArray(String friendNames[], String friendPhones[])

{

int iReturn=0;

int N = friendNames.length;

if (N==friendPhones.length)

{

try

{

for (int iLoop=0; iLoop<N; iLoop++)

{

String inbuff = bufferedReader.readLine();

String tokens[] = inbuff.split(",");

friendNames[iLoop] = new String(tokens[0]);

friendPhones[iLoop] = new String(tokens[1]);

}

}

catch (IOException ex)

{

System.out.println(" Error reading input file ");

iReturn=-1;

}

}

else

{

System.out.println(" memory allocation error ");

iReturn=-2;

}

return(iReturn);

}

public int findAFriend(String friendNames[], String friendPhones[], String targetFriendName)

{

int iReturn=-1;

int N = friendNames.length;

if (N==friendPhones.length)

{

String TargetFriendName = new String(

(targetFriendName.trim()).toUpperCase()

);

for (int iLoop=0; iLoop<N; iLoop++)

{

String curFriendName = new String(

(friendNames[iLoop].trim()).toUpperCase()

);

if (curFriendName.compareTo(TargetFriendName)==0)

{

iReturn = iLoop;

break;

}

}

}

else

{

iReturn = -1;

System.out.println("Error data corrupted ");

}

return(iReturn);

}

public void showFriendsList(String friendNames[], String friendPhones[], String strMsg)

{

int N = friendNames.length;

if (N==friendPhones.length)

{

if (strMsg!=null)

{

System.out.println("*******************************************");

System.out.println(strMsg);

}

System.out.println("**********************************************");

System.out.println("\n # NAME PHONE \n -------------------------------\n");

for (int iLoop=0; iLoop<N; iLoop++)

{

System.out.println( (iLoop+1) + " " + friendNames[iLoop] + " " + friendPhones[iLoop]);

}

}

else

{

System.out.println("Error : Data corrupted ");

}

}

protected void _go(String friendNames[], String friendPhones[])

{

String targetFriendName = "?????";

while (targetFriendName.compareTo("QUIT")!=0)

{

showFriendsList(friendNames,friendPhones,"FRIENDS LIST ");

System.out.println("\n\n");

System.out.print(" Input the friend name or QUIT :> ");

targetFriendName = (scanner.nextLine()).toUpperCase();

if (targetFriendName.compareTo("QUIT")!=0)

{

int iIndexPos = findAFriend(friendNames,friendPhones,targetFriendName);

if (iIndexPos>=0)

{

System.out.println( (iIndexPos+1) + friendNames[iIndexPos] + " " + friendPhones[iIndexPos]);

}

else

{

System.out.println(" Friend " + targetFriendName + " not found ");

}

}

}

}

public int Go()

{

int numFriends = OpenFile();

String friendNames[];

String friendPhones[];

if (numFriends>1)

{

friendNames = new String[numFriends];

friendPhones = new String[numFriends];

if (fillArray(friendNames,friendPhones)==0)

{

_go(friendNames,friendPhones);

}

}

return(numFriends);

}

public static void main(String args[])

{

Friends x = new Friends();

x.Go();

}

}