Develop Reference

How do I update the element inside the arraylist?

public class billing{
private int id;
//File f=new File("C:/Users/Bingus/Documents/Projects/accounts.txt");
private String bc;
private String bd;
private String customerName;
private String customerAddress;
private String customerNumber;
private String periodT;
private String periodF;
private double presentR;
private double previousR;
private double previousB;
private double dueTotal;
private static ArrayList<Account> accountList = new ArrayList<>();
public billing(int id,String bc,String bd,String customerName,String customerAddress,String customerNumber,String periodT,String periodF,double presentR,double previousR,double previousB,double dueTotal){
this.id = id;
this.bc = bc;
this.bd = bd;
this.customerName = customerName;
this.customerAddress = customerAddress;
this.customerNumber = customerNumber;
this.periodT = periodT;
this.periodF = periodF;
this.presentR = presentR;
this.previousR = previousR;
this.previousB = previousB;
this.dueTotal = dueTotal;
}
public int getId(){
return id;
}
public String getBc(){
return bc;
}
public String getBd(){
return bd;
}
public String getCustomerName(){
return customerName;
}
public String getCustomerAddress(){
return customerAddress;
}
public String getCustomerNumber(){
return customerNumber;
}
public String getPeriodT(){
return periodT;
}
public String getPeriodF(){
return periodF;
}
public double getPresentR(){
return presentR;
}
public double getPreviousR(){
return previousR;
}
public double getPreviousB(){
return previousB;
}
public double getDue(){
return dueTotal;
}
public static void main(String[] args){
Scanner scanner = new Scanner (System.in);
Scanner kb = new Scanner (System.in);
int user_choice;
int x = 0;
do{
System.out.println();
System.out.println("1) New Billing");
System.out.println("2) Add Existing Billing");
System.out.println("3) View Billing Account ID");
System.out.println("4) View By Date");
System.out.println("5) Update Existing Billing");
System.out.println("6) Delete Billing Account");
System.out.println("7) Display All Account");
System.out.println("8) Exit");
System.out.println();
System.out.print("Enter choice [1-8]: ");
user_choice = scanner.nextInt();
switch (user_choice){
case 1:
int min = 1000;
int max = 9999;
int randomStr = (int)(Math.random() * (max - min + 1) + min);
int id = randomStr;
System.out.println("Your Account Number is : " + id);
System.out.print("Enter Billing Code: ");
String bc = scanner.next();
System.out.print("Enter Billing Date(dd/mm/yyyy): ");
String bd = scanner.next();
System.out.print("Enter Customer Name: ");
String customerName = kb.nextLine();
System.out.print("Enter Customer Address: ");
String customerAddress = kb.nextLine();
System.out.print("Enter Customer Number: ");
String customerNumber = scanner.next();
System.out.print("Enter Period To: ");
String periodT = scanner.next();
System.out.print("Enter Period From: ");
String periodF = scanner.next();
System.out.print("Enter Present Reading: ");
double presentR = scanner.nextDouble();
System.out.print("Enter Previous Reading: ");
double previousR = scanner.nextDouble();
System.out.print("Enter Previous Balance: ");
double previousB = scanner.nextDouble();
double dueTotal = getTotalDue(presentR,previousR,previousB);
Account user = new Account(id,bc,bd,customerName,customerAddress,customerNumber,periodT,periodF,presentR,previousR,previousB,dueTotal);
accountList.add(user);
break;
case 2:
case 3:
System.out.print("Enter Account Number: ");
int a = scanner.nextInt();
for(int i = 0; i<accountList.size();i++){
if(a == accountList.get(i).getId()){
System.out.println("Account ID: " + accountList.get(i).getId());
System.out.println("Customer Name: " +accountList.get(i).getCustomerName());
System.out.println("Customer Address: " + accountList.get(i).getCustomerAddress());
System.out.print("Customer Number: " + accountList.get(i).getCustomerNumber());
}
}
System.out.println("\nBilling Code\t\tBilling Date\t\tAmount Due");
for(int i = 0; i<accountList.size();i++){
if(a == accountList.get(i).getId())
{
System.out.println(accountList.get(i).getBc()+"\t\t\t"+accountList.get(i).getBd()+"\t\t\t"+accountList.get(i).getDue());
}
}
break;
case 4:
case 5:
System.out.print("Enter Account Number: ");
a = scanner.nextInt();
for(int i = 0; i<accountList.size();i++){
if(a == accountList.get(i).getId())
{
System.out.println("Your Account Number is : " + accountList.get(i).getId());
System.out.print("Enter Billing Code: ");
String bCode = scanner.next();
String c = accountList.get(i).getBc(); //this is the part in which i am having a hard time to fix, ive used the set but still i cannot change the element inside.
int index = accountList.indexOf(c);
accountList.set(index, bCode);
}
}
break;
case 6:
System.out.print("Enter Account Number: ");
a = scanner.nextInt();
System.out.print("Enter Billing Code: ");
String b = scanner.next();
for(int i = 0; i<accountList.size();i++){
if(a == accountList.get(i).getId()){
if(b.equals(accountList.get(i).getBc())){
accountList.remove(i);
System.out.print("\nAccount Removed\n");
}else{
System.out.print("Invalid Billing Code\n");
}
}else if(a != accountList.get(i).getId()){
System.out.print("Invalid Account Number or Number not in the database.\n");
}else{
System.out.print("Try Again\n");
}
}
break;
case 7:
System.out.println("Account ID\t\tBilling Code\t\tAccount Name\t\tTotal Due\t\tPresent R\t\tPrevious R");
Collections.sort(accountList,Collections.reverseOrder());
for(int i=0; i<accountList.size();i++){
System.out.println(accountList.get(i).getId() + "\t\t\t"+accountList.get(i).getBc()+ "\t\t\t"+accountList.get(i).getCustomerName()+ "\t\t\t"+accountList.get(i).getDue()+"\t\t\t"+accountList.get(i).getPresentR()+ "\t\t\t"+accountList.get(i).getPreviousR());
}
break;
}
}while(user_choice!=8);
}
I'm new to programming in Java and I'm still learning towards it. I'm making my billing system which calcualtes the payment. My problem for this is how can I change or update the value which is already in the arraylist, I've tried the set() but I cannot make it work. using arraylist is a big jump for me and I haven't yet got a hang of it. I've watched youtube vids but they seem to show non user input arry lists
Any help?
[1]: https://i.stack.imgur.com/HhF33.png

There are two ways to do it.
First Option is Loop the list and reach the object you want to change, update its attributes. Since the object is accessed by reference, whatever values you will change it will effect.
Second option is remove the object at that index, create a new object and insert at that position.
public void testArrayList ()
{
class MyData
{
String Id = "";
String Name = "";
public MyData () {}
public MyData (String id, String name) {
Id= id;
Name = name;
}
public String toString ()
{
return " Id=" + Id + " Name=" + Name;
}
}
ArrayList myDList = new ArrayList ();
myDList.add(new MyData("1", "John"));
myDList.add(new MyData("2", "Mike"));
myDList.add(new MyData("3", "Tom"));
System.err.println ("Org List " + myDList);
MyData tmp = (MyData) myDList.get(1);
tmp.Id = "22";
tmp.Name = tmp.Name + " Changed";
System.err.println ("Mod List (Observe second Object ) " + myDList);
}

You need to set the value in ArrayList to be an object of type Account.
1.You need to get an object of type Account and use settter method to update bcode
2. Set that Account object back to ArrayList

Code TL:DR. Do you have a set method in your Account class?
//set method example
public void setBc(String newBc){ //can also use other data types as parameters
this.bc = newBc;
}
If so you can just
accountList.get(i).setBc("This New BCODE"); //The parameter can also be a variable of string type

Your code:
System.out.println("Your Account Number is : " + accountList.get(i).getId());
System.out.print("Enter Billing Code: ");
String bCode = scanner.next();
String c = accountList.get(i).getBc(); //this is the part in which i am having a hard time to fix, ive used the set but still i cannot change the element inside.
int index = accountList.indexOf(c);
accountList.set(index, bCode);
If you want to update billing code in an account then get the account object and update the user entered bCode on the object. Also, you don't have to put the account back in the list:
System.out.println("Your Account Number is : " + accountList.get(i).getId());
System.out.print("Enter Billing Code: ");
String bCode = scanner.next();
Account existing = accountList.get(i);
//create new account with same data except bCode
Account updated = new Account(existing.getId(),bCode, existing.getBd(),/*do same for rest of the fields */);
int index = accountList.indexOf(existing);
accountList.set(index, updated);

You have to change this part in Your program
…
Billing billing = accountList.get(i);
//String c = billing.getBc(); // this is the part in which I am having a hard time to fix, I've used
// the set but still I cannot change the element inside.
billing.setBc( yourNewBc );
//int index = accountList.indexOf(c);
//accountList.set(index, billing);
…
class names are capitalized in Java

Here in this example we have iterated over the list and modified the values of the object.
Please make a setter to the values you want to modify and follow something like this.
public class Arr {
public static void main(String args[]){
ArrayList<Person> array = new ArrayList();
Scanner sc=new Scanner(System.in);
while (true){
System.out.println("1.add 2. modify 3.view list ; anything else to to quit");
int choice = sc.nextInt();
if (choice==1){
System.out.println("Enter ID then salary");
int id = sc.nextInt();
int salary = sc.nextInt();
Person p = new Person(id,salary);
array.add(p);
System.out.println("Done");
}
else if (choice==2){
System.out.println("Enter ID");
int id = sc.nextInt();
for (int i = 0; i < array.size(); i++){
Person p = array.get(i);
if (p.getId()==id){
System.out.println("value exits. Enter salary to be modified:");
int salary = sc.nextInt();
p.setSalary(salary);
}
}
System.out.println("Done");
}
else if (choice==3){
for (int i = 0; i < array.size(); i++)
System.out.print(" " + array.get(i).getId() + " " + array.get(i).getSalary());
}
else
break;
}
}
}
public class Person {
int id;
int salary;
public Person(int id, int salary) {
this.id = id;
this.salary = salary;
}
public int getId() {
return id;
}
public int getSalary() {
return salary;
}
public void setSalary(int salary) {
this.salary = salary;
}
}

How do I reference my integer value in main without using setnumbers method

Hello I am new to coding and making a program to calculate a speeding ticket fine but having trouble with setting up my integer variables without using setnums and printing them in my main so I can use my method to calculate tickets by inputting the speed and then the method calculating the total fine based on the speed limit,schoolzone, and mph over.
//main method
public class TicketRunner
{
public static void main(String args[])
{
Scanner keyboard= new Scanner(System.in);
// add code for input here
// Instantiate and print
Ticket test = new Ticket():
System.out.print("\n Enter the Drivers Name?--> ");
String name = keyboard.next();
System.out.print("\n Drivers license Number?--> ");
String tdl = keyboard.nextLine();
System.out.print("\n Address?--> ");
String addr = keyboard.nextLine();
System.out.print("\n City?-->");
String cty = keyboard.nextLine();
System.out.print("\n State?--> ");
String state = keyboard.nextLine();
System.out.print("\n Zip?--> ");
String zip = keyboard.nextLine();
System.out.print("\n Did the violation occur in a school zone? {Y/N} --> ");
String School = keyboard.nextLine();
System.out.print("\n Date of Violation:");
System.out.print("\n Month Number?-->");
int month = keyboard.nextInt();
System.out.print(" Day?-->");
int day = keyboard.nextInt();
System.out.print(" Year?-->");
int year = keyboard.nextInt();
System.out.print(" \n What is the posted speed limit-->");
int limit = keyboard.nextInt();
System.out.print("\n How fast was the car driving travelling in mph?-->");
int travel = keyboard.nextInt();
System.out.println(" is :: " + ticket.calcTicket(ticket));
}
}
//method
public class Ticket
{
//Driver Information
private String name, TDL, address, city, state, zip;
//Violation Information
private int postedSpeed, travelling, ticketAmount, day, month, year;
private boolean schoolZone;
public Ticket()
{
name = "";
TDL = "";
address ="";
city = "";
state ="";
zip = "";
postedSpeed=0;
travelling=0;
ticketamount=0;
day=0;
month=0;
year=0;
}
public Ticket(String nm, String tdl, String addr, String cty, String st, String zp, int pSpd, int travel, int d, int m, int yr, String school)
{
name = nm; TDL = tdl; address = addr; city=cty; state=st; zip=zp; postedspeed=pSpd; travelling=travel;
day=d; month=m; year=yr; schoolZone=school;
}
public void calcTicket()
{
if (travel>postedSpeed)
{
over=travel-postedSpeed;
}
else
{
over=0;
}
//base fine and fine for every mph past the limit
if (over<0)
{
base=0;
}
else if (over>0)
{
base=75;
base=over*6;
}
//fine for being 30mph over speed limit
else if (over>30)
{
ticket = base+160;
}
//school zone fine
if (over<0)
{
zone=0;
}
else if (school.equals("Y"))
{
zone= base*2;
}
else if (school.equals("N"))
zone = base*1;
}
public String lastName()
{
return "";
}
public String toString()
{
//returning method to main
return ""; + base + zone;
}
}

ClassRoll and Constructor methods

public class Exams {
private int score1 = 0;
private int score2 = 0;
private int score3 = 0;
public void setScore1(int sc){
score1 = sc;
}
public void setScore2(int sc){
score2 = sc;
}
public void setScore3(int sc){
score3 = sc;
}
public int getScore1(){
return score1;
}
public int getScore2(){
return score2;
}
public int getScore3(){
return score3;
}
public String toString(){
return String.format("%-10s %-10s %4.2f\n", score1, score2, score3);
}
}
public class Student {
private String fName;
private String lName;
private Exams scores;
Student(String fn, String ln) {
fName = fn;
lName = ln;
scores = new scores();
}
public void setScore1(int sc) {
scores.setScore1(sc);
}
public void setScore2(int sc) {
scores.setScore2(sc);
}
public void setScore3(int sc) {
scores.setScore3(sc);
}
public String toSring(){
return String.format("%-10s %-10s %4.2f\n", fName, lName, scores);
}
public double getAverage(){
}
public int compareTo(Student s){
String name1 = lName + " " + fName;
String name2 = s.lName + " " + s.fName;
return ((lName + " " + fName).compareTo(s.lName + " " + s.fName));
}
}
public class ClassRoll {
private ArrayList<Student> students = new ArrayList<Student>();
private String title;
private String filename = "data.txt";
ClassRoll(String f) {
Scanner kb = new Scanner(System.in);
String inpFileName = kb.next();
File inpFile = new File(inpFileName);
Student s = new Student(fName, lName);
}
void Remove() {
Scanner kb = new Scanner(System.in);
System.out.println("What is the Student's first name?");
String fName = kb.next();
System.out.println("What is the Student's last name?");
String lName = kb.next();
Student s = new Student(fName, lName);
for (int i = 0; i < students.size(); i++) {
if (s.compareTo(students.get(i)) == 0) {
students.remove(i);
} else {
System.out.println("Error: Student is not in Class");
}
}
}
void Display() {
}
void Add() {
Scanner kb = new Scanner(System.in);
System.out.println("What is the Student's first name?");
String fName = kb.next();
System.out.println("What is the Student's last name?");
String lName = kb.next();
System.out.println("What is the Student's first score?");
int score1 = kb.nextInt();
System.out.println("What is the Student's second score?");
int score2 = kb.nextInt();
System.out.println("What is the Student's third score?");
int score3 = kb.nextInt();
Student s = new Student(fName, lName);
for (int i = 0; i < students.size(); i++) {
if (s.compareTo(students.get(i)) == 0) {
System.out.println("Student already in class");
} else {
students.add(s);
}
}
}
void changeScore1() {
Scanner kb = new Scanner(System.in);
System.out.println("What is the Student's first name?");
String fName = kb.next();
System.out.println("What is the Student's last name?");
String lName = kb.next();
System.out.println("What is the Student's first score?");
int score1 = kb.nextInt();
Student s = new Student(fName, lName);
for (int i = 0; i < students.size(); i++) {
if (s.compareTo(students.get(i)) == 0) {
s.setScore1(i);
} else {
System.out.println("Error: Student is not in Class");
}
}
}
void changeScore2() {
Scanner kb = new Scanner(System.in);
System.out.println("What is the Student's first name?");
String fName = kb.next();
System.out.println("What is the Student's last name?");
String lName = kb.next();
System.out.println("What is the Student's first score?");
int score1 = kb.nextInt();
Student s = new Student(fName, lName);
for (int i = 0; i < students.size(); i++) {
if (s.compareTo(students.get(i)) == 0) {
s.setScore2(i);
} else {
System.out.println("Error: Student is not in Class");
}
}
}
void changeScore3() {
Scanner kb = new Scanner(System.in);
System.out.println("What is the Student's first name?");
String fName = kb.next();
System.out.println("What is the Student's last name?");
String lName = kb.next();
System.out.println("What is the Student's first score?");
int score1 = kb.nextInt();
Student s = new Student(fName, lName);
for (int i = 0; i < students.size(); i++) {
if (s.compareTo(students.get(i)) == 0) {
s.setScore3(i);
} else {
System.out.println("Error: Student is not in Class");
}
}
}
public void sortAverage() {
for (int i = 0; i < students.size() - 1; i++) {
for (int j = i + 1; j < students.size(); j++) {
Student s1 = (Student) students.get(i);
Student s2 = (Student) students.get(j);
if (s1.getAverage() < s2.getAverage()) {
students.set(i, s2);
students.set(j, s1);
}
}
}
}
public void sortNames() {
for (int i = 0; i < students.size() - 1; i++) {
for (int j = i + 1; j < students.size(); j++) {
Student s1 = (Student) students.get(i);
Student s2 = (Student) students.get(j);
if (s1.compareTo(s2) > 0) {
students.set(i, s2);
students.set(j, s1);
}
}
}
}
public void save(){
}
}
I have a program with a couple of different classes. In the classroll class after I declare the private variables I have to create a classroll constructor "ClassRoll(String f)" that is suppose to .....
Read the class roll data from the input file f, creates Student objects for each of the students and adds them to the ArrayList of students. The input file contains the course title on the first line. The data for each student appears on a separate line consisting of first name, last name, score1, score 2, and score3 separated by at least one space.
I tried my best to start it off but I'm confused and don't really know the right way of making it. Can someone please help
Thank you

Read the class roll data from the input file f, creates Student
objects for each of the students and adds them to the ArrayList of
students.
Ok, so basically, we have to get student's information from some file and add it to some ArrayList. Alright, lets create an ArrayList for storing stuff first.
ArrayList<Student> studentInfo = new ArrayList<Student>();
You already have this code to read from file:
Scanner kb = new Scanner(System.in);
String inpFileName = kb.next();
File inpFile = new File(inpFileName);
Lets move on....
The input file contains the course title on the first line.
So first element in kb.nextLine() is the course title. This means that we have to start adding student data from second line aka skip the first line. Alright....
The data for each student appears on a separate line consisting of
first name, last name, score1, score 2, and score3 separated by at
least one space.
So basically, if we manage to split lines from space characters, we get data. Now to implement this:
Lets create a boolean variable to check if its first line or not:
boolean firstLine = true; // True - because it starts from first line
Time to start reading lines....
String courseName = ""; //I'll just store in a string, use as you wish
while(kb.hasNextLine()){
if(firstLine){
courseName = kb.nextLine(); //Set courseName if its first line
firstLine = false; // We have moved past first line
}
else{ // Otherwise get student data
// Lets store the student data in a string. This is just one line.
// Something like: "FirstName LastName score1 score2 score3"
String studentData = kb.nextLine();
// Now time to split up data (so we get names/scores separately)
String[] stData = studentData.split("\\s"); //Remember they have spaces between them. \\s --> A pattern that matches one or more spaces
//So we can use those to separate data
// This is how String[] stData contains the student information:
// stData[0] = first name of student
// stData[1] = last name of student
// stData[2] = score1
// stData[3] = score2
// stData[4] = score3
// Use this data however you like
//Now that we have separated data, lets add the student object to ArrayList since we got all details.
studentInfo.add(new Student(stData[0], stData[1]);
// This last line of code is probably not going to do the trick.
// You may need to make changes to your code to do stuff
}
}
In any case, I have told you how to read the problem and how to proceed. You have all the strings, the firstname, lastname and scores. Now its upto you to figure out how to use them. Although the last line of code may not work for your, but its a hint to proceed.
Rest you should try figure out yourself first, since its no fun if I do all the homework ;)

You have replaced the SE with the scire1,2,3
When you get a var in setter method it need to be placed in a property of your class.
Just replace with this code:
public void setScore1(int sc){
score1=sc;
}
public void setScore2(int sc){
score2=sc;
}
public void setScore3(int sc){
score3=sc;
}

How to fix my Array class

I am trying to figure out how to get my array to run correctly, I know I have to change the array value to an input but I cannot get the program to compile if any one can help that be great.
I am trying to have the program take input for grades and names of students and in the end output their name and grade.
Edit sorry this is my first it posting i have an error
Student.java:60: error: class, interface, or enum expected I am in java 101 so this is why it is such low level java, we only know the basics
import java.util.Scanner;
public class students
{
public static void main(String[] args)
{
Scanner keyboard = new Scanner(System.in);
System.out.println("How many students?: ");
int numofstudents = keyboard.nextInt();
Student s = new Student();
s.setMultipleStudents();
s.toString();
System.out.println("Enter the Grade for the student: ");
int gradeofstudnets = keyboard.nextInt();
}
}
and my second class is
import java.util.Scanner;
public class Student
{
Scanner scan = new Scanner(System.in);
private String name;
private int grade;
private int[] multiplegradeinputs = new int[10];
private String[] multipleStudent = new String[10];
public Student()
{
}
public Student(String n, int g)
{
name = n;
grade = g;
}
public String setMultipleStudents()
{
String n = "";
for(int i = 1; i < multipleStudent.length; i++)
{
System.out.println("Enter student #" + i +" name: " );
n = scan.nextLine();
multipleStudent[i] = n;
}
return null;
}
public String multiplegradeinputs()
{
for(int i = 1; i <multiplegradeinputs.length; i++)
{
System.out.println("Enter the Grade of the student#" + i +" : ");
grade = scan.nextInt();
multiplegradeinputs[i] = grade;
}
} <--- error here
public String toString()
{
String temp = "";
for(int i = 1; i < multipleStudent.length; i++)
{
temp += multipleStudent[i] + " ";
}
return temp;
}
}

Add return statement in your multiplegradeinputs() method:
public String multiplegradeinputs()
{
for(int i = 1; i <multiplegradeinputs.length; i++)
{
System.out.println("Enter the Grade of the student#" + i +" : ");
grade = scan.nextInt();
multiplegradeinputs[i] = grade;
}
return null; //Add this line
}
Or change your methods to void return type if they dont return anything.

Class names have to be capitalized in java, so instead of
public class students
you should write
public class Students
Also instead of writing
keyboard.nextInt();
You should write
Integer.parseInt(keyboard.nextLine());
This is mainly because java is full of bugs and technical specifications that you won't find easily. Let me know if this fixes it for you, since you didn't post the exact error message you got.
As for the error that you pointed out, it's because your function expects a String as a return value no matter what, so either change that to void if you can or return a null string. To do that just add the following line at the very end of the method.
return null;

You should create a Student object which holds the properties of the student, e.g. Name and Grades. You should then store all the student objects in some kind of data structure such as an array list in the students class.

Adding to the answer provided by #hitz
You have a bug in the for loops:
for(int i = 1; i <multiplegradeinputs.length; i++)
for(int i = 1; i < multipleStudent.length; i++)
You will never populated multiplegradeinputs[0] and multipleStudent[0] because you start the loop at index == 1 and thus you will have only 9 student names stored instead of 10.
Change to:
for(int i = 0; i <multiplegradeinputs.length; i++)
for(int i = 0; i < multipleStudent.length; i++)
Remember even though the length in 10, the indices always start with 0 in Java and in your case will end with 9.

import java.util.Scanner;
public class Student
{
Scanner scan = new Scanner(System.in);
private String name;
private int grade;
private int[] multiplegradeinputs = new int[10];
private String[] multipleStudent = new String[10];
public Student()
{
}
public Student(String n, int g)
{
name = n;
grade = g;
}
public String setMultipleStudents()
{
String n = "";
for(int i = 1; i < multipleStudent.length; i++)
{
System.out.println("Enter student #" + i +" name: " );
n = scan.nextLine();
multipleStudent[i] = n;
}
return null;
}
public void multiplegradeinputs()
{
for(int i = 1; i <multiplegradeinputs.length; i++)
{
System.out.println("Enter the Grade of the student#" + i +" : ");
grade = scan.nextInt();
multiplegradeinputs[i] = grade;
}
}
public String toString()
{
String temp = "";
for(int i = 1; i < multipleStudent.length; i++)
{
temp += multipleStudent[i] + " ";
}
return temp;
}
}
this is the 2nd class
import java.util.Scanner;
public class students
{
public static void main(String[] args)
{
Scanner keyboard = new Scanner(System.in);
System.out.println("How many students?: ");
int numofstudents = keyboard.nextInt();
Student s = new Student();
s.setMultipleStudents();
s.toString();
System.out.println("Enter the Grade for the student: ");
int gradeofstudnets = keyboard.nextInt();
}
}

You are missing a return value in the multiplegradeinputs() method.

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.