Contacts – Part 4

In this workbook, you will apply the Big 3 steps to the ContactManager class.

The contact manager is identified by the contacts that it manages. It also performs the actions of adding/removing contacts.

Task 1 – Adding the field

Add the contacts field to the ContactManager class. The number of contacts can increase or decrease, so use an ArrayList.

Task 2 – The Big 3

1. Constructor.

   • It receives no parameters.

   • It sets the field equal to a new object of the ArrayList class.

2. Getter: getContact

   • It receives one parameter: int index.

   • It returns an object at the requested index.

3. Setter: setContact

   • It receives two parameters: int index, Contact contact.

   • It sets an element equal to a copy of the object being passed in.

As you're applying each step, careful not to fall into the reference trap.

Task 3 – addContact.

• This method is void

• Receives one parameter: Contact contact

• Adds a contact to the ArrayList.

Task 4 – removeContact.

• This method is void.

• Receives one parameter: String contactName.

• Removes the contact that matches the name passed in.

Task 5 – toString.

• Set a String variable temp that equals "".

• Loop through every contact in the contacts field.

• During each run, add the toString of each contact.

• Then , add two new lines \n\n to temp.

• return temp;

Task 6 – Testing the code

• Inside main(), create an object of the ContactManager class.

• Add three contacts to the contacts field. Use the following values:

  • Ryan 6135012424 11/11/1992

  • Gio 6477092344 11/11/1993

  • Thomas 8192256979 11/11/1994

• Print the ContactManager.

call removeContact and remove "Gio".

Good Luck!