Develop Reference

How to get the average of all the numbers from the list

I need to get the average test score from the numbers the user submitted and keep getting infinity. I need to know the average test score.
This is the student class:
public class Student {
private String name;
private int numOfQuizzes;
private double totalScore;
private ArrayList<Integer> scores;
public Student(String name){
this.name = name;
scores = new ArrayList<Integer>();
}
public String getName() {
return name;
} public void addQuiz(int score){
scores.add(score);
}
public double getTotalScore() {
for(int score : scores){
totalScore += score;
}
return totalScore;
}
public double getAverageScore(){
return totalScore/(double)numOfQuizzes;
}
}
This is what i have for the main:
ArrayList<String> scores = new ArrayList<String>();
Scanner inp = new Scanner(System.in);
// Request the name
System.out.print("What is your name? ");
String name = inp.nextLine();
// Create the student object
Student student = new Student(name);
// Ask for the grades
System.out.print("Please enter your scores (q to quit): ");
String grade = inp.nextLine();
while (!grade.equals("q")) {
// Convert the grade to an integer and pass it
**student.addQuiz(Integer.parseInt(grade));**
//this is where the error is
// Request a new grade
grade = inp.nextLine();
}
// Report the results
System.out.println("Students Name: " + student.getName());
System.out.println("Total Quiz Scores: " + student.getTotalScore());
double average = student.getTotalScore()/scores.size();
System.out.println("Average Quiz Score: " + student.getAverageScore());
This is the Output:
What is your name? b
Please enter your scores (q to quit): 95
95
95
q
Students Name: b
Total Quiz Scores: 285.0
Infinity
Average Quiz Score: Infinity
As you can see I get infinity even when dividing the scores by the size.

You need to make few changes in your code as shown below:
Student Class:
public class Student {
private String name;
private double totalScore;
private ArrayList<Integer> scores;
public Student(String name){
this.name = name;
scores = new ArrayList<Integer>();
}
public String getName() {
return name;
} public void addQuiz(int score){
scores.add(score);
}
public double getTotalScore() {
totalScore = 0;
for(int score : scores){
totalScore += score;
}
return totalScore;
}
public double getAverageScore(){
return getTotalScore()/scores.size();
}
}
Main Class:
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
// Request the name
System.out.print("What is your name?: ");
String name = input.nextLine();
// Create the student object
Student student = new Student(name);
// Ask for the grades
System.out.print("Please enter your scores (q to quit): ");
String grade = input.nextLine();
while (!grade.equals("q")) {
// Convert the grade to an integer and pass it
student.addQuiz(Integer.parseInt(grade));
// Request a new grade
grade = input.nextLine();
}
// Report the results
System.out.println("Students Name: " + student.getName());
System.out.println("Total Quiz Scores: " + student.getTotalScore());
System.out.println("Average Quiz Score: " + student.getAverageScore());
}
}
Try to use this code, It will work correctly and display average score instead of Infinity.
Changes Done:
Removed private int numOfQuizzes; from Student class.
Added totalScore = 0; in getTotalScore() method in Student class.
Added return getTotalScore()/scores.size(); in getAverageScore() method in Student class. Here getTotalScore() with return total score and scores.size() will return total number of scores. (3 in case of your example)
Removed ArrayList<String> scores = new ArrayList<String>(); from Main class. As It is not needed in Main class.
Removed double average = student.getTotalScore()/scores.size(); because student.getAverageScore() in next line will calculate and return average value.

I think you've confused yourself holding onto two lists.
Remove the scores list in the main method. Also remove totalScore from the Student class; that is what is called a "calculated field"
Update the method
public double getTotalScore() {
double totalScore = 0;
for(int score : scores){
totalScore += score;
}
return totalScore;
}
Then you'll actually want a loop like this to more accurately handle ordering of input validation
String grade;
do {
grade = inp.nextLine();
if (grade.equals("q")) break;
// Convert the grade to an integer and pass it
student.addQuiz(Integer.parseInt(grade));
} while (true);
Then, remove numOfQuizzes from the Student class.
In the average method, that's where you use
return getTotalScore()/scores.size();
You're currently getting Infinity twice because
The main method scores are never added to
You're never incrementing this.numOfQuizzes in the Student class

Java NullPointerException why is the array null?

I can output the details from the student, but always when i do it displays
Exception in thread "main" java.lang.NullPointerException
at client.Client.main(Client.java:126)
and the program crashes.
The array is null , I don't why and I don't know how to fix that. Please help me to understand, the problem should be around here..
if (choice == 3) {
for (int a = 0; a < list.length; a++) { //To Display all current Student Information.
// list[i] = new student();
list[a].DisplayOutput();
}
Anyways here comes my code.
package client;
import java.util.Scanner;
public class Client {
//my infos
public static void AuthorInformation() {
System.out.print("__________________________________________\n"
+ "Student Name: xxxxxx xxxxxx\n"
+ "Student ID-Number: xxxxxx\n"
+ "Tutorial Timing: Wednesday 9:30 - 12:30 \n"
+ "Tutor Name: Mr xxxxxx\n\n"
+ "__________________________________________\n");
}
This is my client Class
public static void main(String[] args) {
AuthorInformation(); //calls the method for my information
student[] list = new student[20]; //my array
student student = new student();
int choice = 0; //variable for the choise of the menu
Scanner keyboard = new Scanner(System.in); //Scanner class
do { //MY menu in the do-while, so that it runs at least once while user enters 7(quit)
student.DisplayQuestions();
choice = keyboard.nextInt(); //takes the entered value from the user
if (choice == 1) {
System.out.println("Enter the Number of Students you want to store: ");//Enter amount of students to be stored
int studentNumber = keyboard.nextInt();
// student.addStudent();
for (int i = 0; i < studentNumber; i++) { //for loop is till the student number is achieved
list[i] = new student();
System.out.println("\nTitle of the student (eg, Mr, Miss, Ms, Mrs etc): ");
list[i].SetTitle(keyboard.next());
System.out.println("First name (given name)");
list[i].SetFirstName(keyboard.next());
System.out.println("A last name (family name/surname)");
list[i].SetFamilyName(keyboard.next());
System.out.println("Student number (ID):");
list[i].SetStudentID(keyboard.nextInt());
System.out.println("Enter the Day of birth(1-31): ");
list[i].SetDay(keyboard.nextInt());
System.out.println("Enter the Month of birth (1-12): ");
list[i].SetMonth(keyboard.nextInt());
System.out.println("Enter The Year of birth: ");
list[i].SetYear(keyboard.nextInt());
System.out.println("Students First Assignment Mark (0 - 100): ");
list[i].SetFirstMark(keyboard.nextInt());
System.out.println("Students Second Assignment Mark (0 - 100): ");
list[i].SetSecondMark(keyboard.nextInt());
System.out.println("Enter the mark of Student weekly practical work (0-10) ");
list[i].SetWeeklyMarks(keyboard.nextInt());
System.out.println("Please Enter the Marks for the final Exam(0 - 100): ");
list[i].SetFinalMark(keyboard.nextInt());
/* System.out.println("- - - - - - - - - - - - -");
System.out.println("Do you want to add another Student? (Yes/No)");
String a = keyboard.next();
if (a.equalsIgnoreCase("yes")) {
} else if (a.equalsIgnoreCase("no")) {
i = list.length + 1;
}*/
}
}
if (choice == 2) {
int x = 2;
double AverageNum = 0;
for (int p = 0; p < x; p++) { //This is to take the Average OverallMarks of all students
AverageNum += list[p].OverallMarking();
}
System.out.println("Total Average Of Overall Marks is :" + AverageNum / 2);
}
if (choice == 3) {
for (int a = 0; a < list.length; a++) { //To Display all current Student Information.
// list[i] = new student();
list[a].DisplayOutput();
}
}
if (choice == 4) { //To Display the distribution of grades awarded.
System.out.println("\nGrade Distribution: \n" + student.GetCounterHD() + " HDs\n" + student.GetCounterD() + " Ds\n" + student.GetCounterC() + " Cs\n" + student.GetCounterP() + " Ps\n" + student.GetCounterN() + " Ns\n");
}
if (choice == 5) {
System.out.println("Enter Student's ID Number to search for: "); // to take the id number from the user
int FindID = keyboard.nextInt();
boolean Found = false;
// to find with the student ID Number details of the student.
for (int i = 0; i < 10; i++) {
if (FindID == list[i].GetStudentID()) {
list[i].DisplayOutput();
Found = true;
break;
}
}
}
if (choice == 6) { //
System.out.println("Enter Student's Name to search for: ");
String SearchStudentName = keyboard.next(); //take the name of the student
boolean Found = false;
//To find the name of the student it loops till it has it or the limit of studentnumbers are achieved.
for (int i = 0; i < list.length; i++) {
if (SearchStudentName.equalsIgnoreCase(list[i].GetFirstName())) {
list[i].DisplayOutput();
Found = true;
break;
}
}
}
} while (choice != 7);
{ //while statement quit the program
System.out.println("\nYou Quit.");
}
}
}
And here is my student class
package client;
import java.util.Scanner;
public class student {
//The instance vriables for students (Title, first name, family name,
Student ID, date of birth in day month and year, first and second
assignment mark, mark of weekly practical work and final exam
private String Title;
private String FirstName;
private String FamilyName;
private long StudentID;
private int Day;
private int Month;
private int Year;
private float FirstMark;
private float SecondMark;
private float WeeklyMarks;
private float FinalMark;
//those private instance variables are for the calculation of (first and
second assignment mark, mark of weekly practical work and exam mark, final
mark and overall mark)
private float FirstMarkPercentage;
private float SecondMarkPercentage;
private float WeeklyMarksPercentage;
private float ExamPercentage;
private String FinalGrade;
private float OverallMarks = 0;
//those private instance variables are to count the the marks(
private int CounterN = 0;
private int CounterP = 0;
private int CounterC = 0;
private int CounterD = 0;
private int CounterHD = 0;
public student(String Title, String FirstName, String FamilyName, long StudentID, int Day, int Month, int Year, float FirstMark, float SecondMark, float WeeklyMarks, float FinalMark) {
this.Title = Title;
this.FirstName = FirstName;
this.FamilyName = FamilyName;
this.StudentID = StudentID;
this.Day = Day;
this.Month = Month;
this.Year = Year;
this.FirstMark = FirstMark;
this.SecondMark = SecondMark;
this.WeeklyMarks = WeeklyMarks;
this.FinalMark = FinalMark;
this.FinalGrade = FinalGrade;
}
//This Method is to display (Title, first name, family name, Student ID, date of birth in day month and year, first and second assignment mark, mark of weekly practical work and final exam)
public student() {
Title = "";
FirstName = "";
FamilyName = "";
StudentID = 0;
Day = 0;
Month = 0;
Year = 0;
FirstMark = 0;
SecondMark = 0;
WeeklyMarks = 0;
FinalMark = 0;
}
//The methods starting with Get...(), are to return the (Title, first name, family name, Student ID, date of birth in day month and year, first and second assignment mark, mark of weekly practical work and final exam and the marks N, P, C, D & HD)
public String GetTitle() {
return Title;
}
public String GetFirstName() {
return FirstName;
}
public String GetFamilyName() {
return FamilyName;
}
public long GetStudentID() {
return StudentID;
}
public int GetDay() {
return Day;
}
public int GetMonth() {
return Month;
}
public int GetYear() {
return Year;
}
public float GetFirstMark() {
return FirstMark;
}
public float GetSecondMark() {
return SecondMark;
}
public float GetWeeklyMarks() {
return WeeklyMarks;
}
public float GetFinalMark() {
return FinalMark;
}
public String GetFinalGrade() {
return FinalGrade;
}
public int GetCounterHD() {
return CounterHD;
}
public int GetCounterD() {
return CounterD;
}
public int GetCounterC() {
return CounterC;
}
public int GetCounterP() {
return CounterP;
}
public int GetCounterN() {
return CounterN;
}
public float GetOverallMarks() {
return OverallMarks;
}
//The methods starting with Set...(), are to set the (Title, first name, family name, Student ID, date of birth in day month and year, first and second assignment mark, mark of weekly practical work and final exam and the marks N, P, C, D & HD)
public void SetTitle(String Title) {
this.Title = Title;
}
public void SetFirstName(String FirstName) {
this.FirstName = FirstName;
}
public void SetFamilyName(String FamilyName) {
this.FamilyName = FamilyName;
}
public void SetStudentID(int StudentID) {
this.StudentID = StudentID;
}
public void SetDay(int Day) {
this.Day = Day;
}
public void SetMonth(int Month) {
this.Month = Month;
}
public void SetYear(int Year) {
this.Year = Year;
}
public void SetFirstMark(float FirstMark) {
this.FirstMark = FirstMark;
}
public void SetSecondMark(float SecondMark) {
this.SecondMark = SecondMark;
}
public void SetWeeklyMarks(float WeeklyMarks) {
this.WeeklyMarks = WeeklyMarks;
}
public void SetFinalMark(float FinalMark) {
this.FinalMark = FinalMark;
}
public void SetFinalGrade(String FinalGrade) {
this.FinalGrade = FinalGrade;
}
public void SetOverallMarks(float OverallMarks) {
this.OverallMarks = OverallMarks;
}
public boolean equals(student OtherStudent) {
return (this.FirstName.equalsIgnoreCase(OtherStudent.FirstName)) && (this.FamilyName.equalsIgnoreCase(OtherStudent.FamilyName));
}
//this method is for the calculation of (first and second assignment mark, mark of weekly practical work and exam mark, final mark and overall mark)
public float OverallMarking() {
FirstMarkPercentage = ((FirstMark / 100) * 20);
SecondMarkPercentage = ((SecondMark / 100) * 20);
WeeklyMarksPercentage = ((WeeklyMarks / 10) * 10);
ExamPercentage = ((FinalMark / 100) * 50);
OverallMarks = FirstMarkPercentage + SecondMarkPercentage + WeeklyMarksPercentage + ExamPercentage; //for the overall mark returns
return OverallMarks;
}
//this function arranges the grade calculations and returns the final grade
public String GradeCalculations() {
if (OverallMarks >= 80 && OverallMarks <= 100) { // if grade lies within this range print HD
FinalGrade = "HD";
CounterHD++;
} else if (OverallMarks >= 70 && OverallMarks < 80) { // if grade lies within this range print D
FinalGrade = "D";
CounterD++;
} else if (OverallMarks >= 60 && OverallMarks < 70) { // if grade lies within this range print C
FinalGrade = "C";
CounterC++;
} else if (OverallMarks >= 50 && OverallMarks < 60) { // if grade lies within this range print P
FinalGrade = "P";
CounterP++;
} else if (OverallMarks < 50 && OverallMarks >= 0) { // if grade lies within this range print N
FinalGrade = "N";
CounterN++;
}
return FinalGrade;
}
public void DisplayQuestions() {
System.out.println("\n Welcome to the Menu to perform one of the following operations (You must enter a number between 1-7):");
System.out.println("(1) To add the Student Information.");
System.out.println("(2) To Display the Output from the Average Overall Mark for students.");
System.out.println("(3) To Display all current Student Information.");
System.out.println("(4) To Display the distribution of grades awarded.");
System.out.println("(5) for entering a student ID Number To view all details of the student.");
System.out.println("(6) for entering a student name To view all details of the student.");
System.out.println("(7) Quit");
System.out.println("\n__________________________________________");
}
//This function displays the details of the student with before calculated marks.
public void DisplayOutput() {
System.out.println("\nName: " + GetTitle() + " " + GetFirstName() + " " + GetFamilyName());
System.out.println("Student ID: " + GetStudentID());
System.out.println("Date of Birth: " + GetDay() + "/" + GetMonth() + "/" + GetYear());
System.out.println("Assignment 1 Marks: " + GetFirstMark());
System.out.println("Assignment 2 Marks: " + GetSecondMark());
System.out.println("Weekly Practical Marks: " + GetWeeklyMarks());
System.out.println("Final Exam Marks: " + GetFinalMark());
System.out.println("Final Marks & Grade: " + OverallMarking() + "/" + GradeCalculations());
}
public void addStudent() {
/*Scanner keyboard = new Scanner(System.in);
for (int i = 0; i < list.length; i++) { //for loop is till the student number is achieved
list[i] = new student();
System.out.println("\nTitle of the student (eg, Mr, Miss, Ms, Mrs etc): ");
list[i].SetTitle(keyboard.next());
System.out.println("First name (given name)");
list[i].SetFirstName(keyboard.next());
System.out.println("A last name (family name/surname)");
list[i].SetFamilyName(keyboard.next());
System.out.println("Student number (ID):");
list[i].SetStudentID(keyboard.nextInt());
System.out.println("Enter the Day of birth(1-31): ");
list[i].SetDay(keyboard.nextInt());
System.out.println("Enter the Month of birth (1-12): ");
list[i].SetMonth(keyboard.nextInt());
System.out.println("Enter The Year of birth: ");
list[i].SetYear(keyboard.nextInt());
System.out.println("Students First Assignment Mark (0 - 100): ");
list[i].SetFirstMark(keyboard.nextInt());
System.out.println("Students Second Assignment Mark (0 - 100): ");
list[i].SetSecondMark(keyboard.nextInt());
System.out.println("Enter the mark of Student weekly practical work (0-10) ");
list[i].SetWeeklyMarks(keyboard.nextInt());
System.out.println("Please Enter the Marks for the final Exam(0 - 100): ");
list[i].SetFinalMark(keyboard.nextInt());
System.out.println("- - - - - - - - - - - - -");
System.out.println("Do you want to add another Student? (Yes/No)");
String a = keyboard.next();
if (a.equalsIgnoreCase("yes")) {
addStudent();
} else if (a.equalsIgnoreCase("no")) {
i=list.length+1;
}
}*/
}
}

The array isn't null.
The exception is thrown when you try to call a method on a null member of the array.
You iterate over the full array, but have not necessarily filled the entire array. Members that you have not assigned to reference an object are null.
for (int a = 0; a < list.length; a++) { //To Display all current Student Information.
// list[i] = new student();
list[a].DisplayOutput();
}
One fix would be to stop iterating after you've hit the first null.
for (int a = 0; a < list.length; a++) { //To Display all current Student Information.
// list[i] = new student();
student student = list[a];
if ( null == student ) {
break;
}
else {
list[a].DisplayOutput();
}
}
Another fix would be to remember in case 1 how many students were stored, and change the loop condition to reflect that.
for (int a = 0; a < cntStudents; a++) { //To Display all current Student Information.
By the way, in Java code it is almost universally accepted that:
Class names begin with an uppercase character.
Method names begin with a lowercase character.

Cannot run the Threshold correctly Java

Main.java
import java.util.*;
public class Main{
static Student[] students = new Student[10];//creates an array of 10 students to be entered
public static int inputThreshold(){
Scanner scan = new Scanner(System.in);
System.out.println("Please enter the Threshold: \n");
int threshold = scan.nextInt();
return Threshold();
}
public static Student inputStudent(){
Scanner scan = new Scanner(System.in);
System.out.println("Enter students surname: \n");//instructs the user to enter a surname
String name = scan.nextLine();//allows the user to input sdtudents surname
System.out.println("Enter student score between 0 and 30: \n");
int score = scan.nextInt();//allows the user to input students score
return new Student(name, score);
}
public static void printStudent(Student student){
int percentage = student.getScore()*10/3;//retrieves the percentage of the score submitted out of 30
System.out.println("Surname: " + student.getName() + " Score: " + student.getScore() + " Percentage: " + percentage + "%");
//prints out the surname, score and percentage achieved by the student
}
public static void printThreshold(int threshold){
int percentage = student.getScore()*10/3;//retrieves the percentage of the score submitted out of 30
if (percentage < threshold){
System.out.println("Surname: " + student.getName() + " Score: " + student.getScore() + " Percentage: " + percentage + "%");
//prints out the surname, score and percentage achieved by the student
}
}
public static Student getWinner(Student[] student){
Student x = student[0];
for(int i = 1; i < 10; i++){
if(student[i].getScore() > x.getScore()){
x = student[i];
}
}
return x;
}
public static void main(String[] args){
for (int i = 0; i = 1; i++){
threshold = inputThreshold;
}
for (int i = 0; i < 10; i++){
students[i] = inputStudent();
}
for(int i = 0; i < 10; i++){
printStudent(students[i]);
}
for(int i= 0; i < 1; i++){
printThreshold(students[i]);
}
Student winrar = getWinner(students);//retrieves the winner from getWinner into a variable
System.out.println("AND WE HAVE OUR WINNER! \n" + "Name: " + winrar.getName() + " Score: " + winrar.getScore());
//prints out the highest scoring students surname, with their score
}
}
Student.java
public class Student{
private String name;//sets name to characters
private int score;//sets score to numbers
private int threshold;//sets the threshold of the score
private int max = 30;//sets max score to 30
public Student(String name, int score){
this.name = name;
if (score <= max && score >= 0) //if the score is equal to 30 or less than 0
this.score = score;//the score can be stored
else{
System.out.println("This number is too big ");//if it is larger than 30 it cannot be stored and shows errors message
System.exit(1);//this will end the program
}
}
public String getName(){
return name;
}
public int getScore(){
return score;
}
public int getThreshold(){
return threshold;
}
public void setScore(int s){
this.score = s;
}
public void setName(String n){
this.name = n;
}
public void setThreshold(int t){
this.threshold = t;
}
}
Is returns Cannot Find Symbol - method Threshold()
I'm not sure what to refer to or how to call the method to get it to run correctly. Brief: 10 users, 10 scores. There's a threshold to be achieved by each entrant. The program outputs their names, scores achieved and the percentage of their score. But it should also announce the overall winner.
Not sure here

return Threshold();
should be
return threshold;

change Threshold() to threshold.
I strongly advice you to read this article before writing another program
Objects, Instance Methods, and Instance Variables

public static int inputThreshold(){
Scanner scan = new Scanner(System.in);
System.out.println("Please enter the Threshold: \n");
int threshold = scan.nextInt();
return Threshold();
}
public static void main(String[] args){
for (int i = 0; i = 1; i++){
threshold = inputThreshold;
}
...rest of code in main
}
threshold is a local variable defined in inputStudent(), you can't access it in main() .Also return Threshold();, there is no Threshold() method defined in the code you've provided

How do I add user input to parallel arrays in java?

This is the code I have now and it is completely butchered. I am having issues try to allow user input of a String and two doubles to go into 3 parallel arrays and then save to a .txt file. I can not figure out what is wrong could someone please assist me?
public static void addGames(int i, String[] array1, double[] array2,
double[] array3, int arrayLength, Scanner keyboard) throws IOException
{
String newName;
double newPrice;
double newRating;
if(i < arrayLength)
{
System.out.println("Please enter another game name: ");
newName = keyboard.next();
array1[i] = newName;
System.out.println("Please enter another game price: ");
newPrice = keyboard.nextDouble();
array2[i] = newPrice;
System.out.println("Please enter another game rating: ");
newRating = keyboard.nextDouble();
array3[i] = newRating;
i++;
}
else
{
System.out.println("There is no more room to store games: ");
}
PrintWriter gamerOut = new PrintWriter("Project1_VideoGames.txt");
while(i < array1.length)
{
gamerOut.write(array1[i]);
gamerOut.add(array2[i]);
gamerOut.add(array3[i]);
i++;
}
gamerOut.close();
}

for (int j = 0; j < i; ++j) {
gamerOut.println(array1[j] + "\t" + array2[j] + "\t" + array3[j]);
No need to say the names are too imaginative for me. Make a
public class Game {
String name;
double price;
double rating;
}

Check if this is what you want.
Instead of having 3 arrays, I encapsulated all in a Gameclass.
public class Game {
private String name;
private double price;
private double rating;
public Game(String name, double price, double rating){
this.name = name;
this.price = price;
this.rating = rating;
}
#Override
public String toString(){
String ret = "";
ret = ret + name + " / " + price + " / " + rating;
return ret;
}
}
And this is what I came with for your addGames function. It only takes 1 parameter now: the number of games you want to write in the file.
public static void addGames(int gamesNumber) throws IOException
{
int i = 0;
String newName;
double newPrice, newRating;
Scanner keyboard = new Scanner(System.in);
ArrayList<Game> array = new ArrayList<Game>();
while(i < gamesNumber)
{
System.out.println("Please enter another game name: ");
newName = keyboard.next();
System.out.println("Please enter another game price: ");
newPrice = keyboard.nextDouble();
System.out.println("Please enter another game rating: ");
newRating = keyboard.nextDouble();
System.out.println();
Game game = new Game(newName, newPrice, newRating);
array.add(game);
i++;
}
System.out.println("There is no more room to store games. ");
PrintWriter gamerOut = new PrintWriter("Project1_VideoGames.txt");
i = 0;
while(i < array.size())
{
gamerOut.println(array.get(i));
i++;
}
gamerOut.close();
System.out.println("The games have been written in the file");
}
You probably want to handle some errors while reading the users input or handle exceptions from the FileWriter but I'll leave that to you.
Also, I've changed to PrintWriter#println method instead of PrintWriter#write and override the toString method in the Game class. You may want to change the implementation of that too.
Hope this helped.

Method to display records.

Hey guys just need help on how to finish this up.
Code Snippet:
import java.util.Scanner;
public class CreateLoans implements LoanConstants {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
//set the program here
float prime;
float amountOfLoan = 0;
String customerFirstName;
String customerLastName;
String LoanType;
System.out.println("Please Enter the current prime interest rate");
prime = sc.nextInt() / 100f;
//ask for Personal or Business
System.out.println("are you after a business or personal loan? Type business or personal");
LoanType = sc.next();
//enter the Loan amount
System.out.println("Enter the amount of loan");
amountOfLoan = sc.nextInt();
//enter Customer Names
System.out.println("Enter First Name");
customerFirstName = sc.next();
System.out.println("Enter Last Name");
customerLastName = sc.next();
//enter the term
System.out.println("Enter the Type of Loan you want. 1 = short tem , 2 = medium term , 3 = long term");
int t = sc.nextInt();
}
}
I need to display the records I have asked and store the object into an array.
so this where I'm stuck. I need to do this in a loop 5 times and by the end display all records in an array, if that makes sense?

Try this way :
import java.util.Scanner;
public class CreateLoans {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
Loan[] loans = new Loan[5];
for(int i=0;i<5;i++) {
loans[i] = new Loan();
System.out.println("Please Enter the current prime interest rate");
float prime = sc.nextInt();
prime = (float)(prime/100f);
loans[i].setPrime(prime);
//ask for Personal or Business
System.out.println("are you after a business or personal loan? Type business or personal");
String loanType = sc.next();
loans[i].setLoanType(loanType);
//enter the Loan amount
System.out.println("Enter the amount of loan");
float amountOfLoan = sc.nextFloat();
loans[i].setAmountOfLoan(amountOfLoan);
//enter Customer Names
System.out.println("Enter First Name");
String customerFirstName = sc.next();
loans[i].setCustomerFirstName(customerFirstName);
System.out.println("Enter Last Name");
String customerLastName = sc.next();
loans[i].setCustomerLastName(customerLastName);
}
//Display details
for(int i=0;i<5;i++) {
System.out.println(loans[i]);
}
}
}
class Loan {
private float prime;
private float amountOfLoan = 0;
private String customerFirstName;
private String customerLastName;
private String LoanType;
public float getPrime() {
return prime;
}
public void setPrime(float prime) {
this.prime = prime;
}
public float getAmountOfLoan() {
return amountOfLoan;
}
public void setAmountOfLoan(float amountOfLoan) {
this.amountOfLoan = amountOfLoan;
}
public String getCustomerFirstName() {
return customerFirstName;
}
public void setCustomerFirstName(String customerFirstName) {
this.customerFirstName = customerFirstName;
}
public String getCustomerLastName() {
return customerLastName;
}
public void setCustomerLastName(String customerLastName) {
this.customerLastName = customerLastName;
}
public String getLoanType() {
return LoanType;
}
public void setLoanType(String loanType) {
LoanType = loanType;
}
#Override
public String toString() {
return "First Name : " + customerFirstName + "\n" +
"Last Name : " + customerLastName + "\n" +
"Amount of Loan : " + amountOfLoan + "\n" +
"Loan type : " + LoanType + "\n" +
"Prime : " + prime + "\n\n";
}
}
Create a Loan class and put all necessary details as private members into it and override toString() method.

Make a ArrayList and add all the variables inside that list
ArrayList arrlist = new ArrayList();
arrlist.add(prime);
arrlist.add(LoanType);
arrlist.add(amountOfLoan);
arrlist.add(customerFirstName );
arrlist.add(customerLastName);
arrlist.add(t);
and display the ArrayList
System.out.println(arrlist);

Example of a loop
int[] nums = new int[5];
String[] names = new String[5];
Scanner input = new Scanner(System.in);
for (int i = 0; i < 5; i++){
System.out.println("Enter a number: ");
int number = input.nextInt();
// insert into array
nums[i] = number;
System.out.println("Enter a name: ");
String name = input.nextLne();
// insert into array
names[i] = name;
}
Everything you want to be looped 5 times, you can put inside the loop. Whatever values you want to store, you can do that in the loop also.