Question

java NetBeans

Class Entry:

1. Implement the class Entry that has a name (String), phoneNumber (String), and address (String).
2. Implement the initialization constructor .
3. Implement the setters and getters for all attributes.
4. Implement the toString() method to display all attributes.
5. Implement the equals (Entry other) to determine if two entries are equal to each other. Two entries are considered equal if they have the same name, phoneNumber, and address.
6. Implement the compareTo (Entry other) method that returns 0 if the two entries have the same number, -1 if this.number is smaller than other.number, and + 1 if this.number is > other.number

Class PhoneBook

1. Implement the class PhoneBook that has a city (String), type (String), entryList (an ArrayList of Entry).
2. Implement the constructors to initialize the city and type.
3. Implement the method addEntryToPhoneBook(Entry e) that adds an entry to the phone book.
4. Implement the method toString() that displays all attributes and all enties information of the phone book.
5. Implement the method displayAll() that displays all entries in the phone book.
6. Implement the method checkEntryByNumber(String number) that takes a number and returns the entry with that number if it exists.
7. Implement the method checkEntrisByName(String name) that takes a name, and returns an array list of the entries that start with this name or letters.
8. Implement the method removeEntryFromPhoneBook (String number) that removes an entry from the arrayList of entires in the phone book.

Class TestPhoneBook

1. Create a phone book and initialize its attributes.
2. Add 5 entries to the phone book list using the method addEntryToPhoneBook()
3. Display all entries in the phone book.
4. Display the entry information for a given phone number if it exists. Give the appropriate message if it does not exist.
5. Display all entries starting with the letters "Abd"
6. Remove a specific entry from the phone book. Display the proper message if it was removed , or if it did not exist.
7. Sort and display the entries of the phone book

Answer 1

Hello,

Please find the below code :

public class Entry implements Comparable<Entry> {
   private String name;
   private String phoneNumber;
   private String address;

   public Entry(String name, String phoneNumber, String address) {
       super();
       this.name = name;
       this.phoneNumber = phoneNumber;
       this.address = address;
   }

   @Override
   public int hashCode() {
       final int prime = 31;
       int result = 1;
       result = prime * result + ((address == null) ? 0 : address.hashCode());
       result = prime * result + ((name == null) ? 0 : name.hashCode());
       result = prime * result + ((phoneNumber == null) ? 0 : phoneNumber.hashCode());
       return result;
   }

   @Override
   public boolean equals(Object obj) {
       if (this == obj)
           return true;
       if (obj == null)
           return false;
       if (getClass() != obj.getClass())
           return false;
       Entry other = (Entry) obj;
       if (address == null) {
           if (other.address != null)
               return false;
       } else if (!address.equals(other.address))
           return false;
       if (name == null) {
           if (other.name != null)
               return false;
       } else if (!name.equals(other.name))
           return false;
       if (phoneNumber == null) {
           if (other.phoneNumber != null)
               return false;
       } else if (!phoneNumber.equals(other.phoneNumber))
           return false;
       return true;
   }

   @Override
   public String toString() {
       return "Entry [name=" + name + ", phoneNumber=" + phoneNumber + ", address=" + address + "]";
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public String getPhoneNumber() {
       return phoneNumber;
   }

   public void setPhoneNumber(String phoneNumber) {
       this.phoneNumber = phoneNumber;
   }

   public String getAddress() {
       return address;
   }

   public void setAddress(String address) {
       this.address = address;
   }

   @Override
   public int compareTo(Entry o) {
       return (Integer.valueOf(this.phoneNumber) < Integer.valueOf(o.phoneNumber)) ? -1
               : (Integer.valueOf(this.phoneNumber) > Integer.valueOf(o.phoneNumber)) ? 1 : 0;

   }

}

import java.util.ArrayList;
import java.util.List;

public class Phonebook {
   private String city;
   private String type;
   public List<Entry> entryList;

   public Phonebook(String city, String type) {
       super();
       this.city = city;
       this.type = type;
       entryList = new ArrayList<Entry>();
   }

   public void addEntryToPhoneBook(Entry entry) {
       entryList.add(entry);
   }

   @Override
   public String toString() {
       return "Phonebook [entryList=" + entryList + "]";
   }

   public List<Entry> displayAll() {
       return entryList;
   }

   /*
   * checkEntryByNumber
   */
   public Entry checkEntryByNumber(String number) {
       for (int index = 0; index < entryList.size(); index++) {
           if (entryList.get(index).getPhoneNumber() == number) {
               return entryList.get(index);
           }
       }
       System.out.println("Phone number does not exists");
       // Returning null if Phone number doesn't exists
       return null;
   }

   /*
   * checkEntrisByName
   */
   public List<Entry> checkEntrisByName(String name) {
       List<Entry> list = new ArrayList<Entry>();
       for (int index = 0; index < entryList.size(); index++) {
           if (entryList.get(index).getName().startsWith(name)) {
               list.add(entryList.get(index));
           }
       }
       return list;
   }

   /*
   * removeEntryFromPhoneBook
   */
   public void removeEntryFromPhoneBook(String number) {

       for (int index = 0; index < entryList.size(); index++) {
           if (entryList.get(index).getPhoneNumber() == number) {
               System.out.println("Removed the entry : " + entryList.get(index).getName());
               entryList.remove(index);
           }
       }
   }
}

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class TestPhonebook {
   public static void main(String[] args) {
       // Create a phone book and initialize its attributes.

       Phonebook book = new Phonebook("Kolkata", "Unknown");

       // Add 5 entries to the phone book list using the method addEntryToPhoneBook()

       Entry e1 = new Entry("Abdite", "1234567891", "C/O abc");
       Entry e2 = new Entry("Jibran", "6783644", "C/O weew");
       Entry e3 = new Entry("Abdlice", "876574", "C/O wewe");
       Entry e4 = new Entry("Smith", "9275454", "C/O wewewe");
       Entry e5 = new Entry("John", "846333", "C/O weweew");

       book.addEntryToPhoneBook(e1);
       book.addEntryToPhoneBook(e2);
       book.addEntryToPhoneBook(e3);
       book.addEntryToPhoneBook(e4);
       book.addEntryToPhoneBook(e5);

       // Display all entries in the phone book.

       List<Entry> list = book.displayAll();
       for (int index = 0; index < list.size(); index++) {
           System.out.println(list.get(index).toString());
       }

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

       System.out.println(book.checkEntryByNumber("1234567891"));
       System.out.println(book.checkEntryByNumber("123"));

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

       // Display all entries starting with the letters "Abd"
       List<Entry> list1 = book.checkEntrisByName("Abd");
       System.out.println(list1);

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

       // Remove a specific entry from the phone book. Display the proper message if it
       // was removed , or if it did not exist.
       book.removeEntryFromPhoneBook("1234567891");

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

       // Sort and display the entries of the phone book
       Collections.sort(book.displayAll());
       System.out.println(book.displayAll());
   }
}

Test Result:

Code ScreenShots:

Please let me know if you any questions regarding this.

Thanks