CS 1054: Laboratory Exercise 8

Objective

This exercise's objective is to gain some more experience in working with classes.

To Receive Credit

Show the work that you do to the GTA.

Activities

Create a new project within Eclipse. Name it Lab8.

Add a new class to the project and name it class "Entry". Delete all the source code present in that class file and copy and paste the code given below.

import java.io.*;

class Entry{

	// Declare instance variables here
	private String ???
	private String ???
	private String ???
	private String ???

	// Constructor method
	public Entry(String firstname, String lastname){
		???
	}
	
	public void printEntry(){
		System.out.println(last + ", " + first);
		???
		???
	}

	public void setPhone(String phone){
		???
	}

	public String getLastFirst(){
		return ??? + ", " + ???;
	}

	public String getFirst(){
		return ???;
	}
}

Your task is to complete the Entry class. You will have to decide how to implement the methods of the class that are described below. The Entry class needs to store a person’s first name, last name, phone number, and email address. To do this, declare four private instance variables for these four values. Use String references for the variables.
Second, complete the constructor. The constructor will need to take two String references as parameters: first and last names. Be careful not to use the same identifiers as your instance variable names or you will hide them. The constructor must initialize the two instance variables for the name.
Third, you will need to complete or add definitions for the following methods to the class:
- Enter() – this is the constructor and it takes in a first and last name as parameters
- setPhone() – takes in phone number as a parameter
- setEmail() – takes in e-mail address
- getLastFirst() – returns name in the format of lastName, firstName
- getFirstLast() – returns name in the format of firstName lastName
- getFirst() – returns first name only
- getLast() – returns last name only
- getPhone() – returns phone number
- getEmail() – returns e-mail address
- printEntry() - should print the instance data to the screen in the following format: line 1: last name, first name line 2: e-mail address line 3: phone number
Remember that when a method returns a value, the prototype must show the return type and the last line of the method should be a return statement. Methods that set variables or print values do not return any value and should have a return type of "void." Also note that the instance variables have all been declared private in this case and the accessor/mutator methods public.

To test your class, create a new class and name it Address. Copy the following code in the editor window for that class.

import java.io.File;
import java.util.Scanner;

// Program Address
// Author: 
// Purpose: Test program for Entry class - reads in three names and builds Entry objects
// Modified by: Mir Farooq Ali

class Address {
	public static void main (String arg[]) throws Exception {
		Entry n1, n2, n3, n4;
		String printing;
		String filename = "Address.Input.txt";
		Scanner inFile;
		inFile = new Scanner (new File(filename));

		n1 = getInfo(inFile);
		n2 = getInfo(inFile);
		n3 = getInfo(inFile);
		n4 = getInfo(inFile);		

		n1.printEntry();
		System.out.println();

		System.out.println(n2.getLastFirst());
		System.out.println(n2.getEmail());
		System.out.println();

		System.out.println(n3.getFirstLast());
		System.out.println(n3.getPhone());
		System.out.println();

		System.out.println(n4.getLast() + ", " + n4.getFirst());
	} //end main

	// Method: getInfo
	// Purpose: reads a single person's address information and creates an Entry object

	public static Entry getInfo(Scanner inFile) throws Exception {
		String first, last, phone, email; // stores entry information
		Entry entry = null;

		first = inFile.next(); //read first name
		last = inFile.next(); // read last name
		phone = inFile.next(); // read phone number
		email = inFile.next(); // read email
		entry = new Entry(first, last); //create entry with name
		entry.setPhone(phone); //add phone and email
		entry.setEmail(email);

		return entry;
	} //end getInfo
} //end Address class

You can see that this class utilizes the Entry class and its methods that you just created.

Also download this input file into the same folder where your project got created. Now run the program and you should see that input values are being read from the input file and then being printed out.