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[littlechaoz]

i need help with this java assigment, im totally confused as to what to do :(

/**
 * ContactDatabase.java
 *
 * This class implements a database of contacts that can be
 * added to, searched, displayed, or items removed.  An ArrayList
 * is used to store the database.
 *
 * @author
 * @version
 */

import java.util.ArrayList;
import java.util.Scanner;

/**
* The ContactDatabase class stores each contact in an arraylist.
* Methods exist to add new contacts, search contacts, delete, and print contacts
* to the console.
*/
public class ContactDatabase
{
	private ArrayList<Contact> contacts;		// ArrayList of contact
	private static final int QUIT = 0;			// Menu choices
	private static final int ADD = 1;
	private static final int LISTALL = 2;
	private static final int SEARCH = 3;
	private static final int DELETE = 4;

	/**
	* Default constructor - make a new ArrayList object with parameter type Contact
	*/
	ContactDatabase()
	{
		 
	}

	/**
	* inputContact inputs contact information from the keyboard.
	* It then stores this new contact in the contacts ArrayList.
	*/
	public void inputContact()
	{
		
	}

	/**
	* displayAll iterates through the ArrayList of contacts and outputs each one
	* to the screen.
	*/
	public void displayAll()
	{
		
	}

	/**
	* displayMatch inputs a keyword from the user.
	* It then iterates through the ArrayList of contacts and outputs each one
	* to the screen if the contact information contains the keyword.
	*/
	public void displayMatch()
	{
		
	}

	/**
	* deleteMatch inputs a keyword from the user.
	* It then iterates through the ArrayList of contacts and asks the user
	* if the contact should be deleted, if the contact information contains the keyword.
	*/
	public void deleteMatch()
	{
		
	}

	// Main class
	public static void main(String[] args)
	{
		ContactDatabase cdb = new ContactDatabase();
		Scanner scan = new Scanner(System.in);
		int choice = ADD;

		// Main menu
		while (choice != QUIT)
		{
			System.out.println();
			System.out.println("Choose from the following:");
			System.out.println("0) Quit");
			System.out.println("1) Add new contact");
			System.out.println("2) List all contacts");
			System.out.println("3) Search contacts by keyword and display");
			System.out.println("4) Search contacts by keyword and remove");
			choice = scan.nextInt();
			switch (choice)
			{
				case ADD: 	cdb.inputContact();
							break;
				case LISTALL: cdb.displayAll();
							break;
				case SEARCH: cdb.displayMatch();
							break;
				case DELETE: cdb.deleteMatch();
							break;
			}
		}
	}

	/**
	 * The inner class, Contact, stores the details for a single contact.  
	 *  There is no error checking on any of the input.  Whatever string is 
	 *  passed in for a given attribute is accepted.  
	 */
	class Contact
	{
	   private String first, last, phone, email;

	   /**
	    * Constructors.
	    */
	   public Contact()
	   {
	   }

	   public Contact(String first, String last, String phone, String email)
	   {
	      this.first = first;
	      this.last = last;
	      this.phone = phone;
	      this.email = email;
	   }

	   /*
	    * Accessor Methods
	    */

	   public String getFirst()
	   {
	      return first;
	   }

	   public String getLast()
	   {
	      return last;
	   }

	   public String getPhone()
	   {
	      return phone;
	   }

	   public String getEmail()
	   {
	      return email;
	   }

	   /* 
	    * Mutator Methods
	    */
	   public void setFirst(String first)
	   {
	      this.first = first;
	   }

	   public void setLast(String last)
	   {
	      this.last = last;
	   }

	   public void setPhone(String phone)
	   {
	      this.phone = phone;
	   }

	   public void setEmail(String em)
	   {
	      this.email = em;
	   }



	   /*
	    * Return all fields concatenated into a string
	    */
	   public String toString()
	   {
	      return last + ", " + first + ". " + phone + ", " + email;
	   }


	   public boolean equals(Object otherObject)
	   {
	      if (otherObject ==null)
	      {
	         return false;
	      }
	      else if (getClass() != otherObject.getClass())
	      {
	         return false;
	      }
	      else
	      {
	         Contact otherContact = (Contact)otherObject;
	         return (first.equals(otherContact.first) && 
	               last.equals(otherContact.last)&&
	               phone.equals(otherContact.phone)&&
	               email.equals(otherContact.email));
	      }
	   }

	} // end inner class, Contact
} // end class, ContactDatabase

[Supamagier]

So are we. Tell us what you did, what the error/problem is, and, most important... what is your assignment?

[hardwired]

confused as to what to do
Looks like you need to implement the empty methods of the ContactDatabase class:

ContactDatabase()
{
    // instantiate your ArrayList here
}

public void inputContact()
{
    // Receive user input for the required fields in the Contact
    //     class, viz, names, phone, email.
    // Use these to create a new instance of Contact and add this
    //     new instance to the contacts list.
}

public void displayAll()
{
    // Run through list and for each entry print out the Contact info.
    // Since Contact overrides the [i]toString[/i] method then all you
    // need to do is
    // System.out.println("contact = " contacts.get(i));
}

public void displayMatch()
{
    // get keyword input from user to be used in search
    // run througth list and print out each Contact which
    // has the keyword, viz, name, phone or email.
}

public void deleteMatch()
{
    // get keyword input from user to be used in search
    // run through list and look for any Contact that has
    //     the keyword
    // prompt user to make sure they want to delete the
    //     (next/current) Contact you found
    // if yes, delete the Contact
}

[Fubarable]

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Java Programming - Help :|