Question

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Design a class Contact with the data and functionality for one made up contact person ( Don't use actual contact). As data it should store a name, email, and phone.

The functions should include getter (accessor) and setter (modifier) functions for each of these data items.

Write a small main function that initializes an array of size 10 with:

• 3 Contact objects for your friends, and
• 7 Contact objects with default data (blank).

Show how you would change the phone for one contact

Answer 1

public class Contact {

   // private instance variables
   private String name;
   private String email;
   private String phone;

   // constructor
   public Contact() {
       this.name = " ";
       this.email = " ";
       this.phone = " ";
   }

   // constructor with fields
   public Contact(String name, String email, String phone) {
       this.name = name;
       this.email = email;
       this.phone = phone;
   }

   // getter for getting name
   public String getName() {
       return name;
   }

   // setter for setting name
   public void setName(String name) {
       this.name = name;
   }

   // getter for getting email
   public String getEmail() {
       return email;
   }

   // setter for setting email
   public void setEmail(String email) {
       this.email = email;
   }

   // getter for getting phone
   public String getPhone() {
       return phone;
   }

   // setter for setting phone
   public void setPhone(String phone) {
       this.phone = phone;
   }

   public static void main(String... args) {

       // contacts array
       Contact[] contacts = new Contact[10];

       // Add three friends data
       contacts[0] = new Contact("Friend A", "[email protected]", "6543210");
       contacts[1] = new Contact("Friend B", "[email protected]", "6643617");
       contacts[2] = new Contact("Friend C", "[email protected]", "6243219");

       // add seven contacts with blank data
       for (int i = 3; i < 10; i++) {

           contacts[i] = new Contact();
       }

       // Print list
       System.out.println("Original Contacts List : ");
       System.out.println();
       for (int i = 0; i < 10; i++) {

           System.out.println(contacts[i].name + " " + contacts[i].email + " " + contacts[i].phone);

       }

       // change Friend C data
       contacts[2].setPhone("6200012");
      
      
// Print modified lits
       System.out.println("Modified Contacts List after changing friend C phone : ");
       System.out.println();
       for (int i = 0; i < 10; i++) {

           System.out.println(contacts[i].name + " " + contacts[i].email + " " + contacts[i].phone);

       }
   }

}

// Output