Question

Hello Can you help to fix the program. When running, it still show

Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - cannot find symbol
symbol: class Contact
location: class ContactMap
   at ContactMap.main(ContactMap.java:40)
C:\Users\user\AppData\Local\NetBeans\Cache\8.1\executor-snippets\run.xml:53: Java returned: 1
BUILD FAILED (total time: 1 second)

************************

import java.io.BufferedReader;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import java.util.Scanner;

import java.util.TreeMap;

public class ContactMap

{

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

{

Scanner input=new Scanner(System.in);

//Create a TreeMap , to store contact object with last name as the key

Map<String, Contact> contactsMap = new TreeMap<String, Contact>();

//Prompt the user to enter the contacts file name

System.out.print("Enter the contacts file name: ");

//Read the file name

String contactsFile=input.nextLine();

//Open the file

BufferedReader in = new BufferedReader(new FileReader(contactsFile));

String line = "";

//Read all contacts into tree map

while ((line = in.readLine()) != null)

{

String columns[] = line.split("\t");

contactsMap.put(columns[1].trim(), new Contact(columns[0].trim(),columns[1].trim(),columns[2].trim(),columns[3].trim()));

}

//Run the menu

while(true)

{

int choice;

//Print the menu

System.out.println("1. Add a contact to the list");

System.out.println("2. Delete a contact from the list");

System.out.println("3. Display the entire contact list.");

System.out.println("4.Exit");

System.out.print("Enter your choice: ");

//Read the choice

choice=input.nextInt();

switch(choice)

{

case 1:

//Read new contact information

System.out.print("Enter the first name: ");

input.nextLine();

String fName=input.nextLine();

System.out.print("Enter the last name: ");

String lName=input.nextLine();

System.out.print("Enter the phone number: ");

String phoneNumber=input.nextLine();

System.out.print("Enter the email-id: ");

String eId=input.nextLine();

//Call the addToList method

addToList(contactsMap,new Contact(fName,lName,phoneNumber,eId));

break;

case 2:

//Prompt the user to enter the last name

System.out.print("Enter the last name to remove from the contacts: ");

input.nextLine();

//Read the last name

String phNo= input.nextLine();

//Call the deleteFromList method

deleteFromList(contactsMap,phNo);

break;

case 3:

//Call displayContacts to print all contacts

displyContacts(contactsMap);

input.nextLine();

break;

case 4:

//Exit from the program

System.exit(0);

default: System.out.println("Enter a valid choice");

}

}

}

//Adds the new Contact to the treemap.

static void addToList(Map<String, Contact> contactsMap,Contact newContact )

{

contactsMap.put(newContact.getLName(),newContact);

}

//deletes a contact from the list by last name

static void deleteFromList(Map<String, Contact> contactsMap,String pNo)

{

if(contactsMap.get(pNo)!=null)

{

System.out.println("Contact : "+contactsMap.get(pNo)+ " with phone number "+pNo+" is removed");

contactsMap.remove(pNo);

}

else

System.out.println("Contact does not exist with phone number "+pNo);

}

//Display all contacts

static void displyContacts(Map<String, Contact> contactsMap)

{

for (String key : contactsMap.keySet())

{

System.out.println(contactsMap.get(key));

}

}

}

Answer 1

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Map;
import java.util.Scanner;
import java.util.TreeMap;

/**
* The Class ContactMap.
*/
public class ContactMap

{

   /**
   * The main method.
   *
   * @param args the arguments
   * @throws IOException Signals that an I/O exception has occurred.
   */
   public static void main(String args[]) throws IOException

   {

       Scanner input = new Scanner(System.in);

//Create a TreeMap , to store contact object with last name as the key

       Map<String, Contact> contactsMap = new TreeMap<String, Contact>();

//Prompt the user to enter the contacts file name

       System.out.print("Enter the contacts file name: ");

//Read the file name

       String contactsFile = input.nextLine();

//Open the file

       BufferedReader in = new BufferedReader(new FileReader(contactsFile));

       String line = "";

//Read all contacts into tree map

       while ((line = in.readLine()) != null)

       {

           String columns[] = line.split("\t");

           contactsMap.put(columns[1].trim(),
                   new Contact(columns[0].trim(), columns[1].trim(), columns[2].trim(), columns[3].trim()));

       }

//Run the menu

       while (true)

       {

           int choice;

//Print the menu

           System.out.println("1. Add a contact to the list");

           System.out.println("2. Delete a contact from the list");

           System.out.println("3. Display the entire contact list.");

           System.out.println("4.Exit");

           System.out.print("Enter your choice: ");

//Read the choice

           choice = input.nextInt();

           switch (choice)

           {

           case 1:

//Read new contact information

               System.out.print("Enter the first name: ");

               input.nextLine();

               String fName = input.nextLine();

               System.out.print("Enter the last name: ");

               String lName = input.nextLine();

               System.out.print("Enter the phone number: ");

               String phoneNumber = input.nextLine();

               System.out.print("Enter the email-id: ");

               String eId = input.nextLine();

//Call the addToList method

               addToList(contactsMap, new Contact(fName, lName, phoneNumber, eId));

               break;

           case 2:

//Prompt the user to enter the last name

               System.out.print("Enter the last name to remove from the contacts: ");

               input.nextLine();

//Read the last name

               String phNo = input.nextLine();

//Call the deleteFromList method

               deleteFromList(contactsMap, phNo);

               break;

           case 3:

//Call displayContacts to print all contacts

               displyContacts(contactsMap);

               input.nextLine();

               break;

           case 4:

//Exit from the program

               System.exit(0);

           default:
               System.out.println("Enter a valid choice");

           }

       }

   }

//Adds the new Contact to the treemap.

   /**
* Adds the to list.
*
* @param contactsMap the contacts map
* @param newContact the new contact
*/
static void addToList(Map<String, Contact> contactsMap, Contact newContact)

   {

       contactsMap.put(newContact.getLName(), newContact);

   }

//deletes a contact from the list by last name

   /**
* Delete from list.
*
* @param contactsMap the contacts map
* @param pNo the no
*/
static void deleteFromList(Map<String, Contact> contactsMap, String pNo)

   {

       if (contactsMap.get(pNo) != null)

       {

           System.out.println("Contact : " + contactsMap.get(pNo) + " with phone number " + pNo + " is removed");

           contactsMap.remove(pNo);

       }

       else

           System.out.println("Contact does not exist with phone number " + pNo);

   }

//Display all contacts

   /**
* Disply contacts.
*
* @param contactsMap the contacts map
*/
static void displyContacts(Map<String, Contact> contactsMap)

   {

       for (String key : contactsMap.keySet())

       {

           System.out.println(contactsMap.get(key));

       }

   }

}

/**
* The Class Contact.
*/
class Contact{
   private String firstName;
   private String lastName;
   private String phoneNumber;
   /** The Id. */
   private String Id;
  
   public Contact(String aFirstName, String aLastName, String aPhoneNumber, String aId) {
       super();
       firstName = aFirstName;
       lastName = aLastName;
       phoneNumber = aPhoneNumber;
       Id = aId;
   }
  
   public String getFName() {
       return firstName;
   }
   public String getLName() {
       return lastName;
   }
   public String getPhoneNumber() {
       return phoneNumber;
   }
   public String getId() {
       return Id;
   }
   public void setFirstName(String aFirstName) {
       firstName = aFirstName;
   }
   public void setLastName(String aLastName) {
       lastName = aLastName;
   }
   public void setPhoneNumber(String aPhoneNumber) {
       phoneNumber = aPhoneNumber;
   }
   public void setId(String aId) {
       Id = aId;
   }
   @Override
   public String toString() {
       return "Contact [firstName=" + firstName + ", lastName=" + lastName + ", phoneNumber=" + phoneNumber + ", Id="
               + Id + "]";
   }
  
  
}

// The contact class is missing because of that your getting the error