Question

When the user enters 4 at the menu prompt, your program will access all objects in the array to calculate and display only the largest number of coin denomination, and the total number of coins for the largest denomination. If there are more than one coin denominations having equal amount, you will need to list down all of them. After processing the output for menu option 4, the menu is re-displayed.

Menu option 4 should return as follows.

The largest number of coin denomination is:
$1
5 cent

The total number of $1 coin is: 2
The total number of 5 cent coin is: 2

i'm stuck with the returnDenomination() method

===

// import Scanner class to take user input

import java.util.Scanner;

// Client class

public class Client {

// for display colored terminal output

public static final String ANSI_RESET = "\u001B[0m";

public static final String ANSI_YELLOW = "\u001B[33m";

public static final String ANSI_GREEN = "\u001B[32m";

// scanner object

static Scanner userInput = new Scanner(System.in);

public static void main(String[] args) {

// declare and initialise variables

char yesNo = ' ';

String name;

boolean newPerson;

int menuInput;

int coinAmount;

int personNum = 0;

// declar array of object, Change type

Change person[] = new Change[10];

// for the purpose of testing the program by tutor, hard-coded data

personNum = 9;

person[0] = new Change("Abel", 10);

person[1] = new Change("Belle", 25);

person[2] = new Change("Chanel", 235);

person[3] = new Change("Desmond", 240);

person[4] = new Change("Elaine", 55);

person[5] = new Change("Farah", 60);

person[6] = new Change("Gabriel", 170);

person[7] = new Change("Hazel", 285);

person[8] = new Change("Iris", 190);

// display recommendation msg

System.out.print(ANSI_YELLOW);

System.out.print("\n[System Msg] ");

System.out.print(ANSI_RESET);

System.out.println("Recommendation: Please enter at least 9 records to test the program.");

// loop while userInput is not 'N' for new person

do {

newPerson = true;

System.out.println("\nCurrent record: " + personNum + "/9");

// userInput for name & coinAmount

System.out.print("\nPlease enter the name of the person: ");

name = userInput.nextLine();

System.out.print("Please enter coin value for the person (range 5 to 95, a multiple of 5): ");

coinAmount = userInput.nextInt();

userInput.nextLine();

// verify if useInput amount is valid (range 5 to 95, multiple of 5)

if(coinAmount < 5 || coinAmount > 95 || (coinAmount % 5) !=0) {

System.out.print(ANSI_YELLOW);

System.out.print("\n[System Msg] ");

System.out.print(ANSI_RESET);

System.out.println("Incorrect coin value. Must be in the range 5 to 95, multiple of 5");

continue;

}

// verify person in record

for (int i = 0; i < personNum; i++) {

// update total amount if name matches exisiting record

if (person[i].getName().equalsIgnoreCase(name)) {

person[i].setAmount(person[i].getAmount() + coinAmount);

newPerson = false;

break;

}

}

// add to record if the person is new

if (newPerson)

person[personNum++] = new Change(name, coinAmount);

// break when number of person in record greater/equals 9

if (personNum >= 9)

break;

System.out.print("\nDo you have more person to enter (Y/N): ");

yesNo = Character.toUpperCase(userInput.nextLine().charAt(0));

// verify only Y or N userInput

while (yesNo != 'Y' && yesNo != 'N') {

System.out.print(ANSI_YELLOW);

System.out.print("\n[System Msg] ");

System.out.print(ANSI_RESET);

System.out.print("Invalid! Do you have more person to enter (Y/N): ");

yesNo = Character.toUpperCase(userInput.nextLine().charAt(0));

}

} while(yesNo != 'N'); // end of newPerson do-while loop

// loop until userInput 5 to exit

do {

// display menu

System.out.println("\n1. Enter a name and display change to be given for each denomination");

System.out.println("2. Find the name with the smallest amount and display change to be given for each denomination");

System.out.println("3. Find the name with the largest amount and display change to be given for each denomination");

System.out.println("4. Calculate and display the largest number of coin denomination, and the total number of the coin");

System.out.println("5. Exit");

// wait for userInput

System.out.print("\nWhat would you like to do? Enter your choice: ");

menuInput = userInput.nextInt();

userInput.nextLine();

// display according to userInput

switch (menuInput) {

// display changes based on name of person entered

case 1:

returnIndividual(person, personNum);

break;

// display person with smallest amount and changes

case 2:

returnSmallest(person, personNum);

break;

// display person with largest amount and changes

case 3:

returnLargest(person, personNum);

break;

// display total of largest numer of coin denomination

case 4:

returnDenomination(person, personNum);

break;

// display farewell message and exit program

case 5:

System.out.print(ANSI_YELLOW);

System.out.print("\n[System Msg] ");

System.out.print(ANSI_RESET);

System.out.println("Have a good day ahead. Bye!\n");

System.exit(0);

break;

// default for no case match

default:

System.out.print(ANSI_YELLOW);

System.out.print("\n[System Msg] ");

System.out.print(ANSI_RESET);

System.out.println("Invalid! Please enter your choice again: \n");

}

} while (menuInput != 5); // end of menu do-while loop

} // end of main()

// method to find individual person by name and display denomination

public static void returnIndividual(Change person[], int personNum) {

// declare variable to store array of denomination

int denomination[] = new int[4];

// prompt userInput for name

System.out.print("Enter name: ");

String name = userInput.nextLine();

boolean nameNotFound = true;

// verify display name and coinAmount in record

for (int i = 0; i < personNum; i++) {

if (person[i].getName().equalsIgnoreCase(name)) {

// calculate and return count of each denomination

denomination = person[i].calDenomination();

System.out.println(ANSI_GREEN);

System.out.println("\n" + person[i].getName() + " has an account of: " + person[i].getAmount() + " cents\n");

// display count of each denomination

System.out.println("Change:");

if (denomination[0] != 0)

System.out.println("$1 : " + denomination[0]);

if (denomination[1] != 0)

System.out.println("50￠: " + denomination[1]);

if (denomination[2] != 0)

System.out.println("20￠: " + denomination[2]);

if (denomination[3] != 0)

System.out.println("10￠: " + denomination[3]);

if (denomination[4] != 0)

System.out.println("5￠ : " + denomination[4] + "\n");

System.out.println(ANSI_RESET);

// set flag to false since name is in record

nameNotFound = false;

break;

}

}

// display error msg if name not in record

if (nameNotFound) {

System.out.print(ANSI_YELLOW);

System.out.print("\n[System Msg] ");

System.out.print(ANSI_RESET);

System.out.println(name + " not found in record!\n");

}

} // end of returnIndividual()

public static void returnDenomination(Change person[], int personNum) {

// for menu 4

} // end of returnDenomination

} // end of Client class

Answer 1

//import Scanner class to take user input

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import java.util.TreeMap;
import java.util.Map.Entry;

//Client class

public class Denomination {

//for display colored terminal output

public static final String ANSI_RESET = "\u001B[0m";

public static final String ANSI_YELLOW = "\u001B[33m";

public static final String ANSI_GREEN = "\u001B[32m";

//scanner object

static Scanner userInput = new Scanner(System.in);

public static void main(String[] args) {

//declare and initialise variables

     char yesNo = ' ';
     
     String name;
     
     boolean newPerson;
     
     int menuInput;
     
     int coinAmount;
     
     int personNum = 0;
     
     // declar array of object, Change type
     
     Change person[] = new Change[10];
     
     // for the purpose of testing the program by tutor, hard-coded data
     
     personNum = 9;

     person[0] = new Change("Abel", 10);
     
     person[1] = new Change("Belle", 25);
     
     person[2] = new Change("Chanel", 235);
     
     person[3] = new Change("Desmond", 240);
     
     person[4] = new Change("Elaine", 55);
     
     person[5] = new Change("Farah", 60);
     
     person[6] = new Change("Gabriel", 170);
     
     person[7] = new Change("Hazel", 285);
     
     person[8] = new Change("Iris", 190);

//display recommendation msg
 
 System.out.print(ANSI_YELLOW);
 
 System.out.print("\n[System Msg] ");
 
 System.out.print(ANSI_RESET);
 
 System.out.println("Recommendation: Please enter at least 9 records to test the program.");

//loop while userInput is not 'N' for new person

 do {

     newPerson = true;
     
     System.out.println("\nCurrent record: " + personNum + "/9");
     
     // userInput for name & coinAmount
     
     System.out.print("\nPlease enter the name of the person: ");
     
     name = userInput.nextLine();
     
     System.out.print("Please enter coin value for the person (range 5 to 95, a multiple of 5): ");
     
     coinAmount = userInput.nextInt();
     
     userInput.nextLine();
     
     // verify if useInput amount is valid (range 5 to 95, multiple of 5)
     
     if(coinAmount < 5 || coinAmount > 95 || (coinAmount % 5) !=0) {
     
     System.out.print(ANSI_YELLOW);
     
     System.out.print("\n[System Msg] ");
     
     System.out.print(ANSI_RESET);
     
     System.out.println("Incorrect coin value. Must be in the range 5 to 95, multiple of 5");
     
     continue;
     
     }
     
     // verify person in record
     
     for (int i = 0; i < personNum; i++) {
     
     // update total amount if name matches exisiting record
     
     if (person[i].getName().equalsIgnoreCase(name)) {
     
     person[i].setAmount(person[i].getAmount() + coinAmount);
     
     newPerson = false;
     
     break;
     
     }

 }

//add to record if the person is new

 if (newPerson)
 
     person[personNum++] = new Change(name, coinAmount);
 
 // break when number of person in record greater/equals 9
 
 if (personNum >= 9)
 
     break;
 
 System.out.print("\nDo you have more person to enter (Y/N): ");
 
 yesNo = Character.toUpperCase(userInput.nextLine().charAt(0));
 
 // verify only Y or N userInput
 
 while (yesNo != 'Y' && yesNo != 'N') {
 
     System.out.print(ANSI_YELLOW);
     
     System.out.print("\n[System Msg] ");
     
     System.out.print(ANSI_RESET);
     
     System.out.print("Invalid! Do you have more person to enter (Y/N): ");
     
     yesNo = Character.toUpperCase(userInput.nextLine().charAt(0));
     
     }
 
 } while(yesNo != 'N'); // end of newPerson do-while loop
 
 // loop until userInput 5 to exit

do {

//display menu

 System.out.println("\n1. Enter a name and display change to be given for each denomination");
 
 System.out.println("2. Find the name with the smallest amount and display change to be given for each denomination");
 
 System.out.println("3. Find the name with the largest amount and display change to be given for each denomination");
 
 System.out.println("4. Calculate and display the largest number of coin denomination, and the total number of the coin");
 
 System.out.println("5. Exit");
 
 // wait for userInput
 
 System.out.print("\nWhat would you like to do? Enter your choice: ");
 
 menuInput = userInput.nextInt();
 
 userInput.nextLine();

//display according to userInput

switch (menuInput) {

//display changes based on name of person entered

case 1:

returnIndividual(person, personNum);

break;

//display person with smallest amount and changes

case 2:

returnSmallest(person, personNum);

break;

//display person with largest amount and changes

case 3:

returnLargest(person, personNum);

break;

//display total of largest numer of coin denomination

case 4:

returnDenomination(person, personNum);

break;

//display farewell message and exit program

case 5:

 System.out.print(ANSI_YELLOW);
 
 System.out.print("\n[System Msg] ");
 
 System.out.print(ANSI_RESET);
 
 System.out.println("Have a good day ahead. Bye!\n");
 
 System.exit(0);
 
 break;
 
 // default for no case match
 
 default:
 
 System.out.print(ANSI_YELLOW);
 
 System.out.print("\n[System Msg] ");
 
 System.out.print(ANSI_RESET);
 
 System.out.println("Invalid! Please enter your choice again: \n");

 }
 
 } while (menuInput != 5); // end of menu do-while loop

} // end of main()

//method to find individual person by name and display denomination

public static void returnIndividual(Change person[], int personNum) {

//declare variable to store array of denomination

 int denomination[] = new int[4];
 
 // prompt userInput for name
 
 System.out.print("Enter name: ");
 
 String name = userInput.nextLine();
 
 boolean nameNotFound = true;
 
 // verify display name and coinAmount in record
 
 for (int i = 0; i < personNum; i++) {
     
     if (person[i].getName().equalsIgnoreCase(name)) {
     
     // calculate and return count of each denomination
     
     denomination = person[i].calDenomination();
     
     System.out.println(ANSI_GREEN);
     
     System.out.println("\n" + person[i].getName() + " has an account of: " + person[i].getAmount() + " cents\n");
     
     // display count of each denomination
     
     System.out.println("Change:");
     
     if (denomination[0] != 0)
     
     System.out.println("$1 : " + denomination[0]);
     
     if (denomination[1] != 0)
     
     System.out.println("50￠: " + denomination[1]);
     
     if (denomination[2] != 0)
     
     System.out.println("20￠: " + denomination[2]);
     
     if (denomination[3] != 0)
     
     System.out.println("10￠: " + denomination[3]);
     
     if (denomination[4] != 0)
     
     System.out.println("5￠ : " + denomination[4] + "\n");
     
     System.out.println(ANSI_RESET);
     
     // set flag to false since name is in record
     
     nameNotFound = false;
     
     break;
     
     }
 
 }
 
 // display error msg if name not in record
 
 if (nameNotFound) {
 
 System.out.print(ANSI_YELLOW);
 
 System.out.print("\n[System Msg] ");
 
 System.out.print(ANSI_RESET);
 
 System.out.println(name + " not found in record!\n");
 
 }

} // end of returnIndividual()

public static void returnDenomination(Change person[], int personNum) {

//for menu 4
 int denomination[] = new int[5];
 System.out.print("Enter name: ");
 String name = userInput.nextLine();
 
   for (int i = 0; i < personNum; i++) {
     if (person[i].getName().equalsIgnoreCase(name)) {
     
     // calculate and return count of each denomination
     
     denomination = person[i].calDenomination();
         

                        Map<String, Integer> tm = new TreeMap<String, Integer>();
                        tm.put("$1",50);
                        tm.put("50￠",20);
                        tm.put("20￠",35);
                        tm.put("10￠",15);
                        tm.put("5￠",18);
        
                        List<Integer> al = new ArrayList<Integer>();
                for(Map.Entry<String, Integer> entry:tm.entrySet()) {
                        al.add(entry.getValue());
                }
        
                Collections.sort(al);
                int max=al.get(5-1);
                System.out.println(max);

                System.out.println("The largest number of coin denomination is:");
                
                for(Entry<String, Integer> entry:tm.entrySet()) {
                         if(entry.getValue()==max) {
                                 System.out.println(entry.getKey());
                         }
                   }
                
                for(Entry<String, Integer> entry:tm.entrySet()) {
                         if(entry.getValue()==max) {
                                 System.out.println("The total number of "+entry.getKey()+" coin is: "+max);
                         }
                   }   
         
     }
  
       
   }
 

} // end of returnDenomination

} // end of Client class

In this example Change class is missing so I assume the methods and its type from the given code snippet.

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