I need to create a program that can add, edit, delete, search, and sort the list of customer's points. And I couldn't figure out how to sort, delete, and search the list. Here is my code right now:
/*
RewardPoints.java
Description: This program add, edit, delete, search, and sort customer's reward points.
*/
import java.util.*;
public class Main {
public static void main(String[] args) {
ArrayList <Customers> inventory = new ArrayList <Customers>();
mainMenu(inventory);
}
public static void mainMenu(ArrayList<Customers> inventory) {
Scanner sin = new Scanner(System.in);
int choice = 0;
while (true) {
System.out.println("Grocery Store Cutomer's Points System");
System.out.println("---------------------------------------------------------");
System.out.println("Enter what you would like to do: ");
System.out.println("1 - Print the List of Customers");
System.out.println("2 - Add New Customer");
System.out.println("3 - Delete Customer's Reward Points");
System.out.println("99 - Exit");
System.out.print("Choice? ");
choice = sin.nextInt();
sin.nextLine();
System.out.println();
switch (choice) {
case 1:
selectionSort(inventory);
System.out.println(printListOfCustomers(inventory));
System.out.println();
break;
case 2:
addNewCustomers(inventory);
System.out.println();
break;
case 3:
System.out.println();
break;
case 4:
System.out.println();
break;
case 99:
System.out.println("Exit.");
sin.close();
System.exit(0);
default:
System.out.println("Illegal choice.");
System.out.println();
}
}
}
public static String printListOfCustomers (ArrayList<Customers> inventory) {
String temp = "";
for (int x = 0; x <= inventory.size() - 1; x++) {
temp = temp + inventory.get(x).nlast + " "
+ inventory.get(x).nfirst + " "
+ inventory.get(x).wfirst + " "
+ inventory.get(x).wsecond + " "
+ inventory.get(x).wthird + " "
+ inventory.get(x).wfourth
+ " Bonus Points: "
+ inventory.get(x).bonus
+ " Total Points: "
+ inventory.get(x).Final + "\n";
}
return temp;
}
public static void addNewCustomers (ArrayList<Customers> inventory) {
Customers c;
String nlast, nfirst;
int wfirst, wsecond, wthird, wfourth, total, bonus, Final;
Scanner sin = new Scanner(System.in);
System.out.print("Enter Last Name: ");
nlast = sin.nextLine();
System.out.print("Enter First Name: ");
nfirst = sin.nextLine();
System.out.print("Enter Reward Points for the First Week: ");
wfirst = sin.nextInt();
System.out.print("Enter Reward Points for the Second Week: ");
wsecond = sin.nextInt();
System.out.print("Enter Reward Points for the Third Week: ");
wthird = sin.nextInt();
System.out.print("Enter Reward Points for the fourth Week: ");
wfourth = sin.nextInt();
total = 0;
bonus = 0;
Final = 0;
c = new Customers (nlast, nfirst, wfirst, wsecond, wthird, wfourth, total, bonus, Final);
inventory.add(c);
}
public static void selectionSort (ArrayList<Customers> inventory) {
int i, j, minValue, minIndex, temp = 0;
for (i = 0; i < inventory.length; i++) {
minValue = inventory[i];
minIndex = i;
for (j = i; j < inventory.length; j++) {
if (inventory[j] < minValue) {
minValue = inventory[j];
minIndex = j;
}
}
if (minValue < inventory[i]) {
temp = inventory[i];
inventory[i] = inventory[minIndex];
inventory[minIndex] = temp;
}
}
return list;
}
}
And this is my ArrayList:
// ArrayList <Customers> Inventory
public class Customers {
String nlast;
String nfirst;
int wfirst;
int wsecond;
int wthird;
int wfourth;
int total;
int bonus;
int Final;
public Customers (String _nlast, String _nfirst, int _wfirst, int _wsecond, int _wthird, int _wfourth, int _total, int _bonus, int _Final) {
this.nlast = _nlast;
this.nfirst = _nfirst;
this.wfirst = _wfirst;
this.wsecond = _wsecond;
this.wthird = _wthird;
this.wfourth = _wfourth;
this.total = _wfirst + _wsecond + _wthird + _wfourth;
this.bonus = 1000;
this.Final = _wfirst + _wsecond + _wthird + _wfourth + _bonus;
if (total >= 5000){
this.bonus = 1000;
}
else {
this.bonus = 0;
}
}
}
My first problem is sorting. I tried to use selection sort but I kept getting error that cannot find symbol.
After sorting, I have to make system that can delete and edit the information. But I have no clue..
Also, I need 10 customers' information that are already initialized. I tried like this:
public static void main(String[] args) {
ArrayList <Customers> inventory = new ArrayList <Customers>();
mainMenu(inventory);
ArrayList <String> row1 = new ArrayList <String> ();
ArrayList <String> row2 = new ArrayList <String> ();
ArrayList <String> row3 = new ArrayList <String> ();
ArrayList <String> row4 = new ArrayList <String> ();
ArrayList <String> row5 = new ArrayList <String> ();
ArrayList <String> row6 = new ArrayList <String> ();
ArrayList <String> row7 = new ArrayList <String> ();
ArrayList <String> row8 = new ArrayList <String> ();
ArrayList <String> row9 = new ArrayList <String> ();
ArrayList <String> row10 = new ArrayList <String> ();
// Information of 10 Customers
row1.add("Huang");
row1.add("Renjun");
row1.add("300");
row1.add("200");
row1.add("300");
row1.add("2000");
row2.add("Lee");
row2.add("Jeno");
row2.add("400");
row2.add("230");
row2.add("2000");
row2.add("700");
row3.add("Kim");
row3.add("Doyoung");
row3.add("2000");
row3.add("100");
row3.add("9600");
row3.add("7000");
row4.add("Jeong");
row4.add("Jay");
row4.add("200");
row4.add("100");
row4.add("400");
row4.add("970");
row5.add("Dong");
row5.add("Sicheng");
row5.add("1000");
row5.add("20");
row5.add("8");
row5.add("1997");
row6.add("Wong");
row6.add("Yuk-hei");
row6.add("100");
row6.add("200");
row6.add("5000");
row6.add("1830");
row7.add("Suh");
row7.add("John");
row7.add("2000");
row7.add("900");
row7.add("8400");
row7.add("950");
row8.add("Park");
row8.add("Jisung");
row8.add("2000");
row8.add("500");
row8.add("1800");
row8.add("20");
row9.add("Zhong");
row9.add("Chenle");
row9.add("1100");
row9.add("2200");
row9.add("3300");
row9.add("4400");
row10.add("Na");
row10.add("Jaemin");
row10.add("800");
row10.add("1300");
row10.add("2000");
row10.add("2016");
// Add rows to the inventory
inventory.add(row1);
inventory.add(row2);
inventory.add(row3);
inventory.add(row4);
inventory.add(row5);
inventory.add(row6);
inventory.add(row7);
inventory.add(row8);
inventory.add(row9);
inventory.add(row10);
}
But it didn't work. And I don't know why..
Please help me.. I'm very new to computer science..
