Chapter 7, Problem 2P

Method definition for “lookupName”:

/* Method definition for finding the phone number for given name */

public static String lookupName(String targetName, String names[], String[] phoneNumbers)

{

/* Initializes the empty string for target phone number */

    String targetPhoneNumber = "";

    /* Assign result to "false" */

    boolean result = false;

/* Compute the target phone number for given name using "for" loop */

for(int idx = 0; idx < phoneNumbers.length && !result; idx++)

    {

        /* If "names" equal to "targetName", then */

        if(names[idx].equalsIgnoreCase(targetName))

        {

/* Assign "targetPhoneNumber" to "phoneNumbers[idx]" */

            targetPhoneNumber = phoneNumbers[idx];

            /* Assign "result" to "true" */

            result = true;

        }

    }

/* Finally returns the result of target phone number */

    return targetPhoneNumber;

}

Complete program:

The complete executable code for after implementing the method “lookupName” is given below:

//import required package

import java.util.Scanner;

//Define "SmallPhoneBook" class

public class SmallPhoneBook

{

    //Define main function

    public static void main(String[] args)

    {

        //Create object for scanner class

        Scanner kbd = new Scanner(System.in);

        //Initializes names in "String" array

String[] names = {"Michael Myers", "Ash Williams", "Jack Torrance", "Freddy Krueger"};

//Initializes the phone numbers in "String" array

String[] phoneNumbers = {"333-8000", "333-2323", "333-6150", "333-7970"};

        //Display user prompt statement

        System.out.println("Enter name to look up.");

        //Read the target name from user

        String targetName = kbd.nextLine();

/* Compute the target phone number by calling the method "lookupName" */

String targetPhone = lookupName(targetName, names, phoneNumbers);

/* Display the given phone number for given name  */

System...