JAVA Streams and Writers:

FILE WRITING

Sample Input:
[All Texts in bold corresponds to the input and rest are output]

Enter the number of users:
3
Enter the details of user :1
Jane,1234,jane,jane
Enter the details of user :2
John,5678,john,john
Enter the details of user :3
Jill,1357,jill,jill

CODE:

public class User {
    String name;
    String mobileNumber;
    String username;
    String password;
    
    public User(String name,String mobileNumber,String username,String password)
    {
        this.name=name;
        this.mobileNumber=mobileNumber;
        this.username=username;
        this.password=password;
    }

    public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getMobileNumber() {
return mobileNumber;
}

public void setMobileNumber(String mobileNumber) {
this.mobileNumber = mobileNumber;
}

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}
}

import java.util.*;
import java.io.*;
//static method- only one copy of method in class
public class UserBO {
    public static void writeFile(ArrayList<User> userList, BufferedWriter bw) throws Exception {
        for(int i=0; i<userList.size(); i++) {
            String rec = (userList.get(i)).getName()+","+userList.get(i).getMobileNumber()+","+userList.get(i).getUsername()+","+userList.get(i).getPassword()+"\n";
        bw.write(rec);
        bw.flush();-
        }
        bw.close();
    }
}

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Main {
    public static void main(String args[]) throws IOException {
Scanner sc = new Scanner(System.in);
System.out.println("Enter the number of users:");
int num = Integer.parseInt(sc.nextLine());
ArrayList<User> al = new ArrayList<User>();
FileWriter fw = new FileWriter("output.csv");
BufferedWriter bw = new BufferedWriter(fw);
for(int i=1; i<=num; i++) {
System.out.println("Enter the details of user :"+i);
String record = sc.nextLine();
String  values[]=record.split(",");
User user = new User(values[0],values[1],values[2],values[3]);
al.add(user);
user=null;
}
try {
UserBO.writeFile(al, bw);
} catch (Exception e) {
e.printStackTrace();
}
}
}

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