TY_BCS_JAVA_SLIP 14_1

Slip 14_1. Write a menu driven program to perform the following operations on a text file “phone.txt” which contain name and phone number pairs. The menu should have options:

a.       Search name and display phone number

b.      Add new name-phone number pair.

import java.io.*;

import java.util.*;

class phone

{

                String name,phno;

                phone (String nm,String ph)

                {

                                name = nm;

                                phno=ph;

                }

                public String toString ()

                {

                                String s = name + " " + phno ;

                                return (s);

                }

                public static void search(phone[] arr,int n)throws IOException

                {

                                BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

                                String s=br.readLine();

                                for(int i=0;i<n;i++)

                                {

                                                if(arr[i].name.equals(s))

                                                {

                                                                System.out.println(arr[i].toString());

                                                                return;

                                                }

                                }

                                System.out.println("No Records Found");           

                }

}

class Slip14_1

{

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

                {

                                String s, space = " ";

                                int i;

                                File f = new File ("phone.dat");

                                RandomAccessFile rf = new RandomAccessFile (f, "rw");

                                BufferedReader b = new BufferedReader (new InputStreamReader (System.in));

                                System.out.println ("Enter no.of Customer");

                                int ch,n;

                                n = Integer.parseInt (b.readLine ());

                                System.out.println ("Enter Records:\n <name><phone no> :");

                                for (i = 0; i < n; i++)

                                {

                                                s = b.readLine () + "\n";

                                                rf.writeBytes(s);

                                }

                                rf.close ();

                                RandomAccessFile rf1 = new RandomAccessFile (f, "r");

                                phone p[] = new phone[n];

                                for (i = 0; i < n; i++)

                                {

                                                s = rf1.readLine ();

                                                StringTokenizer t = new StringTokenizer (s, space);

                                                String sn = new String (t.nextToken ());

                                                String sp = new String (t.nextToken ());

                                                p[i] = new phone(sn,sp);

                                }

                                do

                                {

                                                System.out.println("Menu :\n"+"1:Search for a phone no by name\n"+"2:Add a new Record \n"+"3:Exit\n"+"Enter your Choice :" );

                                                ch=Integer.parseInt(b.readLine());

                                                switch (ch)

                                                {                             

                                                                case 1:

                                                                                System.out.println ("Enter name to be searched");

                                                                                phone.search (p,n);

                                                                                break;

                                                                case 2:

                                                                                rf = new RandomAccessFile (f, "rw");

                                                                                System.out.println ("Enter Records:\n <name><phone no> :");

                                                                                String s1 = b.readLine () + "\n";

                                                                                rf.writeBytes(s1);

                                                                                rf.close();

                                                                                rf1 = new RandomAccessFile (f, "r");

                                                                                s = rf1.readLine ();

                                                                                StringTokenizer t = new StringTokenizer (s, space);

                                                                                String sn = new String (t.nextToken ());

                                                                                String sp = new String (t.nextToken ());

                                                                                phone p1 = new phone(sn,sp);

                                                                                System.out.println(" Records are  ");

                                                                                for(i=0;i<n;i++)

                                                                                                System.out.println(p[i].toString());

                                                                                System.out.println(p1.toString());

                                                                                break;

                                                                case 3 :System.exit(0); 

                                                }

                                }while(ch!=3);

                }

}