the program is not executing as it should be? - java

this is my code
"the full code"
import java.util.Scanner;
import java.util.ArrayList;
public class RestTestGhada {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
RestGhada obj2 = new RestGhada("null",0,0,"null");
RestGhada obj3 = new RestGhada();
RestGhada obj4 = new RestGhada();
DateGhada obj5 = new DateGhada(19,8,1998);
DateGhada obj6 = new DateGhada(19,8,2011);
WorkerGhada obj7 = new WorkerGhada("Ghada","Alghamdi",obj5,obj6,"Female");
RestGhada obj8 = new RestGhada(12,"null",20,obj7);
obj2.setID(123456789);
System.out.print("Enter the number of employee: ");
int noemp=input.nextInt();
String empname[] = new String[5];
System.out.print("Enter the employee names: ");
for(int i=0;i<empname.length;i++)
empname[i]=input.nextLine();
obj2.setEmployeeName(empname);
System.out.print("**Menu** \n"
+ "1.Create three objects of restaurant.\n"
+ "2.Display all restaurants information.\n"
+ "3.Display the checkRestaurant result. \n"
+ "4.Exit.\n"
+ "Your choice is: ");
int choice =input.nextInt();
while(choice!=4){
switch(choice){
case 1: obj3.setName("null");obj3.setID(choice);obj4.setNoEmployee(noemp); break;
case 2: obj2.lastprint(); break;
case 3: obj2.CheckRestaurant(noemp); break;
}
System.out.print("\n Your choice: ");
choice=input.nextInt();
}
CorporateGhada[] ArrGroups=new CorporateGhada[4];
RestGhada obj1 = new RestGhada("KFC");
ArrayList<RestGhada>ALRestaurant=new ArrayList();
System.out.println("do you want to enter information?");
String c = input.nextLine();
while (true){
if(c.equals("no")||c.equals("No"))
break;
System.out.print("Menu\n"
+ "1.enter ID,name,number of employee,owner\n"
+ "2.enter ID,adress,name,owner,number of employee\n"
+ "your choice : ");
int choice1 =input.nextInt();
if(choice1 == 1){
System.out.println("Enter ID") ;
int ID=input.nextInt();
System.out.println("Enter name ") ;
String name=input.next();
System.out.println("nbemployee:") ;
int nbemployee =input.nextInt();
System.out.println("Enter owner:") ;
String owner=input.next();
ALRestaurant.add(new RestGhada(name,ID,nbemployee,owner));
}
else if (choice1 == 2){
System.out.println("Enter ID:");
int ID=input.nextInt();
System.out.println("Enter adrees:") ;
String adrees=input.next();
System.out.println("Enter name :");
String name=input.next();
System.out.println("Enter owner:") ;
String owner=input.next();
System.out.println("Enter nbemployee:");
int nbemployee=input.nextInt();
ALRestaurant.add(new RestGhada(ID,adrees,name,owner,nbemployee));
}
else
ALRestaurant.add(new RestGhada());
}
ALRestaurant.remove(1);
for(int i=0; i<ALRestaurant.size();i++ ){
System.out.print(ALRestaurant.get(i));}
System.out.print(ALRestaurant.contains(obj1));
}
}
when i try to run the first quistion doesn't take an answer and it get into the while loop directly.. i already take an information from the user before and it worked but now it's now..
when i run it it turns out like this :
do you want to enter information?
Menu
1.enter ID,name,number of employee,owner
2.enter ID,adress,name,owner,number of employee
your choice :


Did you type anything in the input before the first question was asked?
When I just run this (tried to turn your code into a working example) it waits for me to input:
public static void main(String[] args) {
ArrayList<RestGhada> ALRestaurant = new ArrayList();
Scanner input = new Scanner(System.in);
System.out.println("do you want to enter information?");
String c = input.nextLine();
while (true) {
if (c.equals("no") || c.equals("No"))
break;
System.out.print("Menu\n"
+ "1.enter ID,name,number of employee,owner\n"
+ "2.enter ID,adress,name,owner,number of employee\n"
+ "your choice : ");
int choice1 = input.nextInt();
if (choice1 == 1) {
System.out.println("Enter ID");
int ID = input.nextInt();
System.out.println("Enter name ");
String name = input.next();
System.out.println("nbemployee:");
int nbemployee = input.nextInt();
System.out.println("Enter owner:");
String owner = input.next();
ALRestaurant.add(new RestGhada(name, ID, nbemployee, owner));
} else if (choice1 == 2) {
System.out.println("Enter ID:");
int ID = input.nextInt();
System.out.println("Enter adrees:");
String adrees = input.next();
System.out.println("Enter name :");
String name = input.next();
System.out.println("Enter owner:");
String owner = input.next();
System.out.println("Enter nbemployee:");
int nbemployee = input.nextInt();
ALRestaurant.add(new RestGhada(ID, adrees, name, owner, nbemployee));
} else
ALRestaurant.add(new RestGhada());
}
}
private static class RestGhada {
public RestGhada(int id, String adrees, String name, String owner, int nbemployee) {
}
public RestGhada() {
}
public RestGhada(String name, int id, int nbemployee, String owner) {
}
}


In your code you haven't included your initialisation of the input object.
If you add the line
Scanner input = new Scanner(System.in);
In the beginning of your program it should work.
I ran your program with that line added and it worked.
Besides that you should really look up on correct indentation.


change to this code.
System.out.println("do you want to enter information (yse/no) ? :");
String c = input.nextLine();
while (true) {
if (c.equals("no") || c.equals("No")){
break;
}
else{
System.out.println("Enter Your Choice(1 or 2) :");
int choice1 = input.nextInt();
if (choice1 == 1) {
System.out.println("Enter ID");
int ID = input.nextInt();
System.out.println("Enter name ");
String name = input.next();
System.out.println("nbemployee:");
int nbemployee = input.nextInt();
System.out.println("Enter owner:");
String owner = input.next();
ALRestaurant.add(new RestGhada(name, ID, nbemployee, owner));
} else if (choice1 == 2) {
System.out.println("Enter ID:");
int ID = input.nextInt();
System.out.println("Enter adrees:");
String adrees = input.next();
System.out.println("Enter name :");
String name = input.next();
System.out.println("Enter owner:");
String owner = input.next();
System.out.println("Enter nbemployee:");
int nbemployee = input.nextInt();
ALRestaurant.add(new RestGhada(ID, adrees, name, owner, nbemployee));
} else{
ALRestaurant.add(new RestGhada());
}
}
}

Related

How to access an object parameter from a hashmap value

I am trying to access the accOpBalance parameter from the Account method stored in the HashMap. I want to be able to change this value based on transaction type and store it again. I also want to save the the 6 most recent transactions fot the account but not sure how to approach the problem. I hope this describes the problem well enough. Im still very new to this and would love feedback on my code aswell.
public class BankingSystem{
static int accNum;
static String accName;
static String accAdd;
static String accOpDate;
static double accOpBalance;
int option = 0;
static Scanner keyboard = new Scanner(System.in);
static HashMap<Integer, Account> accounts = new HashMap<Integer, Account>(Map.of(
accNum, new Account(accNum, accName, accAdd, accOpDate, accOpBalance)
));
public BankingSystem() {
}
public static void main(String[] args) {
BankingSystem bankingSystem = new BankingSystem();
int option;
do{
option = mainMenu(keyboard);
System.out.println();
if(option == 1){
bankingSystem.createAccount(keyboard);
} else if (option == 2) {
bankingSystem.showAccounts();
} else if (option == 4) {
bankingSystem.deleteAccount();
}
}while(option != 5);
}
public void createAccount(Scanner keyboard) {
do{
System.out.println("-----------------------------------------------");
System.out.print("Please enter 1 to continue or -1 to exit: ");
option = keyboard.nextInt();
switch (option) {
case 1 -> {
Account newAccount = new Account(accNum, accName, accAdd, accOpDate, accOpBalance);
System.out.println("-----------------------------------------------");
System.out.print("Please enter the new account number: ");
accNum = keyboard.nextInt();
newAccount.setAccNum(accNum);
System.out.print("Please enter the name of the account holder: ");
accName = keyboard.next();
newAccount.setAccName(accName);
System.out.print("Please enter the address of the account holder: ");
accAdd = keyboard.next();
newAccount.setAccAdd(accAdd);
System.out.print("Please enter the accounts open date: ");
accOpDate = keyboard.next();
newAccount.setAccOpDate(accOpDate);
System.out.print("Please enter the starting balance: ");
accOpBalance = keyboard.nextDouble();
newAccount.setAccOpBalance(accOpBalance);
accounts.put(accNum, new Account(accNum, accName, accAdd, accOpDate, accOpBalance));
}
case 2 -> {
System.out.println("Please type -1 the exit create account menu: ");
option = keyboard.nextInt();
}
}
}while (option != -1);
}
public void showAccounts() {
for (Map.Entry<Integer, Account> accountEntry : accounts.entrySet()) {
System.out.println("Account key(number) = " + accountEntry.getKey() + accountEntry.getValue());
}
}
public void deleteAccount(){
int key;
option = 0;
do {
System.out.println("-----------------------------------------------");
System.out.print("Please enter 1 to continue or -1 to exit: ");
option = keyboard.nextInt();
switch (option) {
case 1 -> {
System.out.print("-----------------------------------------------");
System.out.print("Please enter the Account number of the" + "\n" +
" the account you wish to delete");
System.out.print("-----------------------------------------------");
key = keyboard.nextInt();
accounts.remove(key);
}
case 2 -> {
System.out.println("Please type -1 the exit delete account menu: ");
option = keyboard.nextInt();
}
}
}while (option != -1);
}
public static int mainMenu(Scanner keyboard){
int menuOption;
System.out.println("Welcome to the bank of Cal");
System.out.println("-----------------------------------------------");
System.out.println("Main Menu" + "\n" + "Please select option:");
System.out.println("1. Create Account");
System.out.println("2. Display Accounts");
System.out.println("3. Deposit/Withdraw");
System.out.println("4. Delete Account");
System.out.println("5. Exit Program");
System.out.println("-----------------------------------------------");
do{
menuOption = keyboard.nextInt();
}while(menuOption <1 || menuOption >5);
return menuOption;
}
public class Account {
private int accNum;
private String accName;
private String accAdd;
private String accOpDate;
private double accOpBalance;
Scanner getDetails = new Scanner(System.in);
public Account(int theAccNum, String theAccName, String theAccAdd, String theAccOpDate, double theAccOpBalance){
accNum = theAccNum;
accName = theAccName;
accAdd = theAccAdd;
accOpDate = theAccOpDate;
accOpBalance = theAccOpBalance;
}
public void setAccNum(int accNum){
this.accNum = accNum;
}
public int getAccNum(){
return accNum;
}
public void setAccName(String accName){
this.accName = accName;
}
public String getAccName(){
return accName;
}
public void setAccAdd(String accAdd){
this.accAdd = accAdd;
}
public String getAccAdd(){
return accAdd;
}
public void setAccOpDate(String accOpDate){
this.accOpDate = accOpDate;
}
public String getAccOpDate(){
return accOpDate;
}
public void setAccOpBalance(double accOpBalance){
this.accOpBalance = accOpBalance;
}
public double getAccOpBalance(){
return accOpBalance;
}
#Override
public String toString() {
return "\n" + "Account Number: " + accNum + "\n" + "Name: " + accName +
"\n" + "Account Holder Address: " + accAdd + "\n" +"Account open date: "
+ accOpDate + "\n" + "Account balance: " + accOpBalance;
}
}

How can I get this to run another time? [duplicate]

This question already has answers here:
Scanner is skipping nextLine() after using next() or nextFoo()?
(24 answers)
Closed 1 year ago.
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
final int STUDENT_SIZE = 50;
int i = 0;
char choice1 = 'y';
String [] stdntName = new String [50];
String [] WIDNUM = new String [STUDENT_SIZE];
int [] EXM1 = new int [STUDENT_SIZE];
int [] EXM2 = new int [STUDENT_SIZE];
int [] EXM3 = new int [STUDENT_SIZE];
int [] finalExm = new int [STUDENT_SIZE];
for (i=0; i < stdntName.length; i++) {
System.out.print("Please enter the name of Student " + (i+1) + ": ");
stdntName[i] = s.nextLine();
System.out.println("Please enter the WID of Student " + (i+1) + ": ");
WIDNUM[i] = s.nextLine();
if (WIDNUM[i].length() != 9 ) {
System.out.println("**Invalid WID...must be 9-digits");
System.out.println("Please re-enter score:");
WIDNUM[i] = s.nextLine();
}
System.out.println("Please enter score for Exam 1: ");
EXM1[i] = s.nextInt();
if (EXM1[i] < 0 || EXM1[i] > 50) {
System.out.println("**Invalid score...please enter 0-50 only");
System.out.println("Please re-enter score: ");
EXM1[i] = s.nextInt();
}
System.out.println("Please enter score for Exam 2 ");
EXM2[i] = s.nextInt();
if (EXM2[i] < 0 || EXM2[i] > 50) {
System.out.println("**Invalid score...please enter 0-50 only");
System.out.println("Please re-enter score: ");
EXM2[i] = s.nextInt();
}
System.out.println("Please enter score for Exam 3 ");
EXM3[i] = s.nextInt();
if (EXM3[i] < 0 || EXM3[i] > 50) {
System.out.println("**Invalid score...please enter 0-50 only");
System.out.println("Please re-enter score: ");
EXM3[i] = s.nextInt();
}
System.out.println("Please enter score for Final Exam ");
finalExm[i] = s.nextInt();
if (finalExm[i] < 0 || finalExm[i] > 100) {
System.out.println("**Invalid score...please enter 0-100 only");
System.out.println("Please re-enter score: ");
finalExm[i] = s.nextInt();
}
System.out.print("Do you wish to enter another? (y/n): ");
choice1 = s.nextLine().toLowerCase().charAt(0); // read entire line
if (choice1 != 'y') {
break;
}
}
}
}
This is the error message:
Do you wish to enter another? (y/n): Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 0
at java.base/java.lang.StringLatin1.charAt(StringLatin1.java:48)
at java.base/java.lang.String.charAt(String.java:712)
at Proj4.main(Proj4.java:77)

Just add s.nextLine() because you scanner was not reaching the point to get your choice1
Your code fixed
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
final int STUDENT_SIZE = 50;
int i = 0;
char choice1 = 'y';
String [] stdntName = new String [50];
String [] WIDNUM = new String [STUDENT_SIZE];
int [] EXM1 = new int [STUDENT_SIZE];
int [] EXM2 = new int [STUDENT_SIZE];
int [] EXM3 = new int [STUDENT_SIZE];
int [] finalExm = new int [STUDENT_SIZE];
for (i=0; i < stdntName.length; i++) {
System.out.print("Please enter the name of Student " + (i+1) + ": ");
stdntName[i] = s.nextLine();
System.out.println("Please enter the WID of Student " + (i+1) + ": ");
WIDNUM[i] = s.nextLine();
if (WIDNUM[i].length() != 9 ) {
System.out.println("**Invalid WID...must be 9-digits");
System.out.println("Please re-enter score:");
WIDNUM[i] = s.nextLine();
}
System.out.println("Please enter score for Exam 1: ");
EXM1[i] = s.nextInt();
if (EXM1[i] < 0 || EXM1[i] > 50) {
System.out.println("**Invalid score...please enter 0-50 only");
System.out.println("Please re-enter score: ");
EXM1[i] = s.nextInt();
}
System.out.println("Please enter score for Exam 2 ");
EXM2[i] = s.nextInt();
if (EXM2[i] < 0 || EXM2[i] > 50) {
System.out.println("**Invalid score...please enter 0-50 only");
System.out.println("Please re-enter score: ");
EXM2[i] = s.nextInt();
}
System.out.println("Please enter score for Exam 3 ");
EXM3[i] = s.nextInt();
if (EXM3[i] < 0 || EXM3[i] > 50) {
System.out.println("**Invalid score...please enter 0-50 only");
System.out.println("Please re-enter score: ");
EXM3[i] = s.nextInt();
}
System.out.println("Please enter score for Final Exam ");
finalExm[i] = s.nextInt();
if (finalExm[i] < 0 || finalExm[i] > 100) {
System.out.println("**Invalid score...please enter 0-100 only");
System.out.println("Please re-enter score: ");
finalExm[i] = s.nextInt();
}
s.nextLine();
System.out.print("Do you wish to enter another? (y/n): ");
choice1 = s.nextLine().toLowerCase().charAt(0); // read entire line
if (choice1 != 'y') {
break;
}
}
}
}

Use of Private static

Can you find the source of error in this?
package calc;
import java.util.Scanner;
public class Calc {
Scanner scan = new Scanner(System.in);
public void add() {
System.out.println("Enter 1st number");
int s1 = scan.nextInt();
scan.nextLine();
System.out.println("Enter 2nd number");
int s2 = scan.nextInt();
scan.nextLine();
int sum = s1 + s2;
System.out.println("The sum is: " + sum);
}
public void diff() {
System.out.println("Enter 1st number");
int d1 = scan.nextInt();
scan.nextLine();
System.out.println("Enter 2nd number");
int d2 = scan.nextInt();
scan.nextLine();
int diff = d1 - d2;
System.out.println("The difference is: " + diff);
}
public void prod() {
System.out.println("Enter 1st number");
int p1 = scan.nextInt();
scan.nextLine();
System.out.println("Enter 2nd number");
int p2 = scan.nextInt();
scan.nextLine();
int prod = p1 + p2;
System.out.println("The product is: " + prod);
}
public void quo() {
System.out.println("Enter 1st number");
int q1 = scan.nextInt();
scan.nextLine();
System.out.println("Enter 2nd number");
int q2 = scan.nextInt();
scan.nextLine();
int quo = q1 + q2;
System.out.println("The quotient is: " + quo);
}
public static void main(String[] args) {
do {
Calc op = new Calc();
Scanner scan = new Scanner(System.in);
char ans = 0;
System.out.println("Calculator");
System.out.println("1.Addition\n" + "2.Subtraction\n" + "3.Multiplication\n" + "4.Division\n" + "Enter operation number:");
int n1 = scan.nextInt();
scan.nextLine();
switch (n1) {
case 1:
op.add();
break;
case 2:
op.diff();
break;
case 3:
op.prod();
break;
case 4:
op.quo();
break;
default:
System.out.println("Invalid input");
break;
}
System.out.println("Try again? [Y/N]");
ans = scan.nextLine().charAt(0);
} while (ans == 'Y' || ans == 'y');
}
}
and then netbeans has this auto correct that resulted into this:
package calc;
import java.util.Scanner;
public class Calc {
private static char ans;
it added a "private static char ans;" and I would like to understand more how did that fix my code. Thanks

ans is defined within the do{ ... } while() loop but it must be defined outside, to make it available for condition in the while.
So do:
char ans = 0;
do {
Calc op = new Calc();
Scanner scan = new Scanner(System.in);
ans = 0;

java.util.IllegalFormatConversionException: d != java.lang.String

I have problem when print output list of people by using ArrayList
package data;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;
public class Manager {
List<Person> p = new ArrayList();
Scanner sc = new Scanner(System.in);
public void addStudent() {
String id;
String name;
int yob;
double point1;
double point2;
System.out.println("Input student id:");
id = sc.nextLine();
System.out.println("Input student name:");
name = sc.nextLine();
System.out.println("Input yob:");
yob = Integer.parseInt(sc.nextLine());
System.out.println("Input point 1:");
point1 = Double.parseDouble(sc.nextLine());
System.out.println("Input point 2:");
point2 = Double.parseDouble(sc.nextLine());
p.add(new Student(id,name,yob,point1,point2));
}
public void addEmployee() {
String id;
String name;
int yob;
double salaryRatio;
double salary;
System.out.println("Input employee id:");
id = sc.nextLine();
System.out.println("Input employee name:");
name = sc.nextLine();
System.out.println("Input employee yob:");
yob = Integer.parseInt(sc.nextLine());
System.out.println("Input salary ratio:");
salaryRatio = Double.parseDouble(sc.nextLine());
System.out.println("Input salary:");
salary = Double.parseDouble(sc.nextLine());
p.add(new Employee(id, name, yob,salaryRatio, salary));
}
public void addCustomer() {
String id;
String name;
int yob;
String companyName;
double bill;
System.out.println("Input customer id:");
id = sc.nextLine();
System.out.println("Input customer name:");
name = sc.nextLine();
System.out.println("Input customer yob:");
yob = Integer.parseInt(sc.nextLine());
System.out.println("Input compnay name:");
companyName = sc.nextLine();
System.out.println("Input bill:");
bill = Double.parseDouble(sc.nextLine());
p.add(new Customer(id,name,yob,companyName,bill));
}
public void addWho() {
int choice;
do {
System.out.println("1.Add Student");
System.out.println("2.Add Employee");
System.out.println("3.Add Customer");
System.out.println("4.Back to menu");
System.out.println("==============");
System.out.println("Choice:");
choice = Integer.parseInt(sc.nextLine());
switch(choice) {
case 1:
addStudent();
break;
case 2:
addEmployee();
break;
case 3:
addCustomer();
break;
case 4:
break;
}
}
while(choice != 4);
}
public void printPersonById() {
Collections.sort(p, Comparator.comparing(Person::getId));
for (int i = 0; i < p.size(); i++) {
System.out.println(p.get(i));
}
}
Student,Employee, and Customer are sub classes of class Person.When I try to print list,it has an error:
Exception in thread "main" java.util.IllegalFormatConversionException: d != java.lang.String
How can I fix it?

Try this in your code:
System.out.println("Input yob:");
yob = sc.nextInt();
System.out.println("Input point 1:"); point1 =sc.nextDouble();
System.out.println("Input point 2:"); point2 = sc.nextDouble();
p.add(new Student(id,name,yob,point1,point2));

use System.out.println(p.get(i).someMethodOrVariableOfPerson); instead of System.out.println(p.get(i));
like below
public void printPersonById() {
Collections.sort(p, Comparator.comparing(Person::getId));
for (int i = 0; i < p.size(); i++) {
System.out.println("id :"+p.get(i).id);
System.out.println("name :"+p.get(i).name);
}
}
you can not directly print Person class object in out.println() method.
out.println() allow only string value

Trying to sort objects in an arraylist by a property but the objects don't always sort properly

I have four classes but they're just templates so I'll only post my main class (I have overridden toString for each). The sort method is at the bottom. Everything else is fine (more or less) with my code, but when I create the objects in the array and then go to sort them (by a string value called uid) sometimes one or two of them will be out of order. How can I fix this?
Here's the code:
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.InputMismatchException;
import java.util.Scanner;
enum ClassStanding{FRESHMAN,SOPHOMORE,JUNIOR,SENIOR,UNKNOWN,MASTERS_STUDIES,PHD_STUDIES};
enum Major{CS,CEG,EE,ISE,BME,ME,MET,UNKNOWN};
enum StudentType{UNDERGRADUATE,GRADUATE,UNDECLARED};
public class Main {
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
Scanner stdin = new Scanner(System.in);
ArrayList<Student> studentList = new ArrayList<>();
int counter;
boolean continueInput;
int contCounter;
do {
do {
System.out.print("Please enter what you want to do-ADD, REMOVE, SORT, LIST, or SAVE: ");
switch (stdin.next().toLowerCase()) {
case "add":
add(stdin, studentList);
counter = 0;
break;
case "remove":
remove(studentList, stdin);
counter = 0;
break;
case "list":
list(studentList);
counter = 0;
break;
case "save":
String fileName = getFileName(stdin);
save(fileName, studentList);
counter = 0;
break;
case "sort":
counter = 0;
sort(studentList);
break;
default:
System.out.println("Improper input, please enter only ADD, REMOVE, LIST, or SAVE.");
counter = 1;
}
} while (counter == 1);
do {
System.out.print("\nDo you want to continue? Yes or no: ");
switch (stdin.next().toLowerCase()) {
case "yes":
contCounter = 0;
continueInput = true;
break;
case "no":
contCounter = 0;
continueInput = false;
break;
default:
contCounter = 1;
continueInput = false;
System.out.print("\nPlease only enter 'yes' or 'no'.");
}
} while (contCounter == 1);
} while (continueInput);
} // end main method
public static void add(Scanner stdin, ArrayList<Student> studentList) {
String firstName;
String lastName;
String uid;
StudentType studentType;
ClassStanding studentClassStanding;
Major major;
double overallGPA;
double majorGPA;
String majorProfessor;
boolean thesisOption;
System.out.print("Please enter the student's first name: ");
String tempName = stdin.next();
firstName = checkName(tempName);
System.out.print("Please enter the student's last name: ");
tempName = stdin.next();
lastName = checkName(tempName);
System.out.println("Please enter the student's UID in the format 'U####' or 'U#####': ");
String tempUID = stdin.next();
uid = checkUID(tempUID).toUpperCase();
int count;
do {
System.out.print("Please enter the student's status as UNDECLARED, UNDERGRADUATE, or GRADUATE: ");
switch (stdin.next().toUpperCase()) {
case "UNDECLARED":
studentType = StudentType.UNDECLARED;
studentClassStanding = setStudentClassStanding(studentType);
count = 0;
Student student = new Student(firstName, lastName,
uid, studentType, studentClassStanding);
studentList.add(student);
break;
case "UNDERGRADUATE":
studentType = StudentType.UNDERGRADUATE;
major = setMajor();
studentClassStanding = setStudentClassStanding(studentType);
System.out.println("Enter the student's overall GPA below.");
overallGPA = setGPA();
System.out.println("Enter the student's major GPA below.");
majorGPA = setGPA();
count = 0;
UnderGraduate underGraduate = new UnderGraduate(firstName, lastName, uid, studentType,
studentClassStanding, major, overallGPA, majorGPA);
studentList.add(underGraduate);
break;
case "GRADUATE":
studentType = StudentType.GRADUATE;
studentClassStanding = setStudentClassStanding(studentType);
majorProfessor = setMajorProfessor();
thesisOption = setThesisOption();
count = 0;
Graduate graduate = new Graduate(firstName, lastName, uid, studentType,
studentClassStanding, majorProfessor, thesisOption);
studentList.add(graduate);
break;
default:
System.out.println("Please enter either Undeclared, Undergraduate, or Graduate only.");
count = 1;
}
} while (count == 1);
} // end add method
public static String checkName(String tempName) {
int a = 1;
String name1;
Scanner scanner = new Scanner(System.in);
do {
name1 = tempName; // hold the value of firstName in name1
for (int i = 0; i < tempName.length(); i++) { // loop to check input consists of letters (is a name)
if (!Character.isLetter(tempName.charAt(i))) { // if non-letters detected, ensure this was intentional
System.out.println("Please ensure you've entered the correct name. Re-enter the name or enter 'continue' to proceed: ");
tempName = scanner.nextLine();
if (tempName.equalsIgnoreCase("continue")) { // if user enters "continue", use original input
a = 0;
tempName = name1; // pass name1 value to firstName
break;
} else {
a = 1; // continue prompting for firstName
}
} else { // accept input
a = 0;
}
}
} while (a == 1); // loop to ensure proper input
return tempName;
} // end checkName method
public static String checkUID(String tempUID) {
Scanner scan = new Scanner(System.in);
int a;
do {
if (tempUID.charAt(0) == 'U' || tempUID.charAt(0) == 'u') {
if (tempUID.length() == 6 || tempUID.length() == 5) {
a = 0;
} else {
a = 1;
System.out.print("Please ensure input is in the form of U#### or U#####. Please re-enter the UID: ");
tempUID = scan.next();
}
} else {
a = 1;
System.out.print("Please ensure input is in the form of U#### or U#####. Please re-enter the UID: ");
tempUID = scan.next();
}
} while (a == 1);
return tempUID;
} // end checkUID method
public static ClassStanding setStudentClassStanding(StudentType studentType) {
Scanner scan = new Scanner(System.in);
int count;
ClassStanding studentTempClassStanding = null;
do {
if (studentType == StudentType.UNDECLARED || studentType == StudentType.UNDERGRADUATE) {
System.out.print("Please enter the student's class standing as either Freshman, Sophomore, Junior, Senior, or Unknown: ");
switch (scan.next().toUpperCase()) {
case "FRESHMAN":
studentTempClassStanding = ClassStanding.FRESHMAN;
count = 0;
break;
case "SOPHOMORE":
studentTempClassStanding = ClassStanding.SOPHOMORE;
count = 0;
break;
case "JUNIOR":
studentTempClassStanding = ClassStanding.JUNIOR;
count = 0;
break;
case "SENIOR":
studentTempClassStanding = ClassStanding.SENIOR;
count = 0;
break;
case "UNKNOWN":
studentTempClassStanding = ClassStanding.UNKNOWN;
count = 0;
break;
default:
System.out.println("Please enter only Freshman, Sophomore, Junior, Senior, or Unknown.");
count = 1;
}
} else {
System.out.print("Please enter the student's class standing as either 'Masters' for Masters Studies or 'PhD' for PhD Studies: ");
switch (scan.next().toUpperCase()) {
case "MASTERS": studentTempClassStanding = ClassStanding.MASTERS_STUDIES; count = 0; break;
case "PHD": studentTempClassStanding = ClassStanding.PHD_STUDIES; count = 0; break;
default: System.out.println("Please enter only 'Masters' or 'PhD'.");
count = 1;
}
}
} while (count == 1);
return studentTempClassStanding;
} // end setStudentClassStanding method
public static Major setMajor() {
Major tempMaj = null;
Scanner s = new Scanner(System.in);
int c;
do {
System.out.print("Please enter the student's major as either CS, CEG, EE, ISE, BME, ME, MET, or Unknown: ");
switch (s.next().toUpperCase()) {
case "CS":
tempMaj = Major.CS;
c = 0;
break;
case "CEG":
tempMaj = Major.CEG;
c = 0;
break;
case "EE":
tempMaj = Major.EE;
c = 0;
break;
case "ISE":
tempMaj = Major.ISE;
c = 0;
break;
case "BME":
tempMaj = Major.BME;
c = 0;
break;
case "ME":
tempMaj = Major.ME;
c = 0;
break;
case "MET":
tempMaj = Major.MET;
c = 0;
break;
case "UNKOWN":
tempMaj = Major.UNKNOWN;
c = 0;
break;
default:
System.out.println("Please enter only the specified values. ");
c = 1;
}
} while (c == 1);
return tempMaj;
} // end setMajor method
public static double setGPA() {
Scanner s = new Scanner(System.in);
double gpa;
int a;
do {
try {
System.out.print("Please enter the student's GPA: ");
gpa = s.nextDouble();// read in the gpa
if (gpa < 0.0 || gpa > 4.0) { // ensure the gpa is in the correct range
System.out.println("Invalid input, please enter a positive value between 0.0 and 4.0.");
a = 1;
} else {
a = 0;
}
} catch (InputMismatchException ex) { //catch any exceptions, prompt for correct input
a = 1;
gpa = 0.0;
System.out.println("Sorry, please enter a double value.");
s.nextLine(); // skip the last input
}
} while (a == 1 || gpa < 0.0 || gpa > 4.0); //loop while gpa is negative or incorrect input is received
return gpa;
} // end setGPA method
private static String setMajorProfessor() {
Scanner s = new Scanner(System.in);
String prof;
System.out.print("Please enter the name of the major professor: ");
String tempName = s.nextLine();
prof = checkName(tempName);
return prof;
} // end setMajorProfessor method
private static boolean setThesisOption() {
Scanner s = new Scanner(System.in);
boolean thesis = false;
int a;
do {
System.out.print("Please enter 'yes' if a thesis will be written, otherwise enter 'no': ");
switch (s.next().toUpperCase()) {
case "YES": thesis = true; a = 0; break;
case "NO": thesis = false; a = 0; break;
default: System.out.println("Please enter only 'yes' or 'no'."); a = 1;
}
} while (a == 1);
return thesis;
} // end setThesisOption method
private static void list(ArrayList<Student> studentList) {
for (int i = 0; i < studentList.size(); i++) {
System.out.println(studentList.get(i).toString());
}
} // end list method
public static String getFileName(Scanner stdin) {
System.out.print("Please enter the file name: "); // Prompt for input
String fileString = stdin.next();
return fileString; // Pass the fileString var to the main method
}//end of getFileName method
private static void save(String fileName, ArrayList<Student> studentList) {
int a; // create a counter
Scanner stdin = new Scanner(System.in);
do {
try {
PrintWriter writer = new PrintWriter(fileName); // Create a printwriter
for (int i = 0; i < studentList.size(); i++) {
writer.print(studentList.get(i).toString() + "\n"); //Print the arraylist to file
}
writer.close(); //Close the printwriter and save the file
a = 0;
} catch (FileNotFoundException ex) { // Catch any exceptions
System.out.println("The file could not be found, please re-enter the file name: "); // get new file name if an exception is thrown
fileName = stdin.nextLine();
a = 1;
}
} while (a == 1); // loop while exceptions are thrown
System.out.println("All information has been saved at " + fileName); // output that the arraylist has been saved in the specified file
// Make the following its own method
System.out.print("Would you like to read the contents of the file? Yes or no: ");
int b;
do {
switch (stdin.next().toLowerCase()) {
case "yes": readFromFile(fileName); b = 0; break;
case "no": b = 0; break;
default: System.out.println("Please enter only yes or no."); b = 1;
}
} while (b == 1);
} // end save method
private static void remove(ArrayList<Student> studentList, Scanner stdin) {
System.out.print("Please enter the UID of the student to be removed: ");
String tempUID = stdin.next();
String uidRemove = checkUID(tempUID);
for (int i = 0; i < studentList.size(); i++) {
if ((studentList.get(i).getUid()).equalsIgnoreCase(uidRemove)) {
studentList.remove(i);
}
}
System.out.println("The student with UID " + uidRemove + " has been removed.");
} // end remove method
private static void sort(ArrayList<Student> studentList) {
String uidLessU1;
String uidLessU2;
for (int i = 0; i < studentList.size(); i++) {
uidLessU1 = (studentList.get(i).getUid()).substring(1, studentList.get(i).getUid().length());
for (int j = 0; j < studentList.size(); j++) {
uidLessU2 = (studentList.get(j).getUid()).substring(1, studentList.get(j).getUid().length());
if (Integer.parseInt(uidLessU1) < Integer.parseInt(uidLessU2)) {
Student hold = studentList.get(i);
studentList.set(i, studentList.get(j));
studentList.set(j, hold);
}
}
}
} // end sort method
private static void readFromFile(String fileName) {
System.out.println("The contents of " + fileName + " as read from NotePad: ");
try {
Scanner fileReader = new Scanner(new File(fileName)); //Create a scanner
while (fileReader.hasNextLine()) { //Loop to read the file
String fromFile = fileReader.nextLine();
System.out.println(fromFile); //Output the file contents
}
} catch (FileNotFoundException ex) { //Catch any exceptions
System.out.println("Exception caught");
}
} // end readFromFile method
} // end main class
A sample of the problem would be (at this point I've already entered all the values instantiating the objects):
Do you want to continue? Yes or no: yes
Please enter what you want to do-ADD, REMOVE, SORT, LIST, or SAVE: list
Student s w whose UID is U3333 is a
UNDECLARED student doing JUNIOR work.
Student p o whose UID is U1111 is a
UNDECLARED student doing JUNIOR work.
Student p u whose UID is U44444 is a
UNDECLARED student doing JUNIOR work.
Student w e whose UID is U4444 is a
UNDECLARED student doing JUNIOR work.
Student s r whose UID is U2222 is a
UNDECLARED student doing JUNIOR work.
Student s u whose UID is U7777 is a
UNDECLARED student doing JUNIOR work.
Student po iu whose UID is U77777 is a
UNDECLARED student doing JUNIOR work.
Do you want to continue? Yes or no: yes
Please enter what you want to do-ADD, REMOVE, SORT, LIST, or SAVE: sort //calls the sort method
Do you want to continue? Yes or no: yes
Please enter what you want to do-ADD, REMOVE, SORT, LIST, or SAVE: list // calls the list method and prints out the arraylist
Student p o whose UID is U1111 is a
UNDECLARED student doing JUNIOR work.
Student s r whose UID is U2222 is a
UNDECLARED student doing JUNIOR work.
Student s w whose UID is U3333 is a
UNDECLARED student doing JUNIOR work.
Student s u whose UID is U7777 is a //why is this out of place?
UNDECLARED student doing JUNIOR work.
Student w e whose UID is U4444 is a
UNDECLARED student doing JUNIOR work.
Student p u whose UID is U44444 is a
UNDECLARED student doing JUNIOR work.
Student po iu whose UID is U77777 is a
UNDECLARED student doing JUNIOR work.

Just make Student implement Comparable and then you can do
Collections.sort(studentList);

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