I have a project for school and I have some problems with the coding part.
I want to have a kind of database in a file from where I get input. The text in the file I want to be added to an ArrayList and after I want to add a new member. After adding the new member I want it to be added to the ArrayList and to be displayed in an output file.
This is the Main:
import java.util.*;
import java.io.*;
public class Main {
public static List<Member> membersList = new ArrayList<>();
public static readFile file = new readFile();
public static writeFile write = new writeFile();
public static void main(String[] args) throws FileNotFoundException, IOException
{
Main call = new Main();
int choice;
Scanner in = new Scanner(System.in);
do {
System.out.println("\n<<<< CLUB CHAIRMAN >>>>\n");
System.out.println("1-Display members list");
System.out.println("2-Modify a member");
System.out.println("3-Add member");
System.out.println("0-Exit");
System.out.println("\n Select: ");
choice = in.nextInt();
in.nextLine();
if(choice == 1)
{
file.openFile();
file.readFile(membersList);
file.closeFile();
}
if(choice == 2)
{
write.writer();
}
if(choice == 3)
{
call.addNewMember();
}
}while(choice != 0);
}
private void addNewMember() {
int numberOfMembers;
Scanner in = new Scanner(System.in);
System.out.println("How many members do you want to add?");
numberOfMembers = in.nextInt();
in.nextLine();
String[][] newMember = new String[numberOfMembers][4];
for (int i = 0; i < numberOfMembers; i++)
{
System.out.println("\nEnter details for member " + (i + 1) + ":");
System.out.println("Name:");
newMember[i][0] = in.nextLine();
System.out.println("Age:");
newMember[i][1] = in.nextLine();
System.out.println("Gender:");
newMember[i][2] = in.nextLine();
System.out.println("Experience(elite swimmer/swimming for the exercise:");
newMember[i][3] = in.nextLine();
System.out.println("Membership Type(passive/active):");
newMember[i][4] = in.nextLine();
}
for(int i = 0; i < newMember.length; i++)
{
membersList.add(new Member( newMember[i][0], Integer.parseInt( newMember[i][1]), newMember[i][2], newMember[i][3],newMember[i][4]));
}
System.out.println("\nThe action completed successfully");
}
}
class Member
{
private String name;
private int age;
private String gender;
private String experience;
private String membershipType;
Member(String name, int age, String gender, String experience, String membershipType)
{
this.name = name;
this.age = age;
this.gender = gender;
this.experience = experience;
this.membershipType = membershipType;
}
}
I have this error after fills the sections for the new member: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4 at Main.addNewMember(Main.java:64) at Main.main(Main.java:40)
Read file class:
import java.io.*;
import java.util.*;
public class readFile {
private Scanner x ;
public void openFile() throws FileNotFoundException {
try {
x = new Scanner(new File("D:\\Trial Exam\\USE CASE 1\\src\\members"));
} catch (Exception e) {
System.out.println("Couldn't find file");
}
}
public void readFile(List<Member> list) throws FileNotFoundException {
String fileName = "D:\\Trial Exam\\USE CASE 1\\src\\members";
String line = null;
Scanner x = new Scanner(new File(fileName));
try {
FileReader fileReader = new FileReader(fileName);
BufferedReader bufferedReader = new BufferedReader(fileReader);
while ((line = bufferedReader.readLine()) != null) {
String a = x.next();
String b = x.next();
String c = x.next();
String d = x.next();
String e = x.next();
list.add(new Member(a,Integer.parseInt(b),c,d,e));
System.out.println(line);
}
bufferedReader.close();
} catch (FileNotFoundException ex) {
System.out.println(
"Unable to open file '" + fileName + "'");
} catch (IOException ex) {
System.out.println(
"Error reading file '" + fileName + "'");
}
}
public void closeFile() {
x.close();
}
}
Write file class:
import java.io.*;
public class writeFile {
private static String fileName = "D:\\Trial Exam\\USE CASE 1\\src\\output";
public void writer() throws IOException {
Main call = new Main();
PrintWriter pw = null;
FileOutputStream fo = null;
File file = null;
try {
file = new File("D:\\Trial Exam\\USE CASE 1\\src\\output");
pw = new PrintWriter(new FileOutputStream(file));
fo = new FileOutputStream(file);
int memberList = call.membersList.size();
for (int i = 0; i < memberList; i++) {
pw.write(call.membersList.get(i).toString() + "\n");
}
} finally {
pw.flush();
pw.close();
fo.close();
}
}
}
And this is the members input file: Member1 27 male junior passive Member2 28 female senior active Member3 32 female senior passive
String[][] newMember? Why notMember[] newMember? Or better yet, forgetnewMemberand just add the newMembers right intomemberList.