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import java.io.*;
import java.util.*;
class Main {
public static void main(String[] args) throws Exception {
System.out.println("Welcome to Student's Data Management System");
System.out.println();
Scanner sc = new Scanner(System.in);
String username = "a";
int password = 1;
System.out.print("Enter Username: ");
String user = sc.next();
System.out.print("Enter password: ");
int pass = sc.nextInt();
int c = 0;
while (c == 0) {
if (pass == password && user.equals(username)) {
System.out.println("Log in Successful");
int choice = -1;
ArrayList<Student> A = new ArrayList<>();
File file = new File("std.txt");
ObjectInputStream input = null;
ObjectOutputStream output = null;
ListIterator<Student> list = null;
if (file.exists()) {
try {
input = new ObjectInputStream(new FileInputStream(file));
A = (ArrayList<Student>) input.readObject();
input.close();
} catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
}
} else {
System.out.println("Creating a new file.");
file.createNewFile();
}
do {
System.out.println("1. Add");
System.out.println("2. Display");
System.out.println("3. Search");
System.out.println("4. Delete");
System.out.println("5. Update");
System.out.println("0. Exit");
System.out.println("Please enter your choice: ");
choice = sc.nextInt();
switch (choice) {
case 1:
System.out.println("How many Students: ");
int n = sc.nextInt();
for (int i = 0; i < n; i++) {
System.out.println("Enter Name: ");
String name = sc.next();
System.out.println("Enter Id: ");
String id = sc.next();
System.out.println("Enter Department: ");
String dept = sc.next();
System.out.println("Enter Cgpa: ");
float cgpa = sc.nextFloat();
System.out.println("Enter Address: ");
String address = sc.next();
System.out.println("Enter Age: ");
int age = sc.nextInt();
System.out.println("Enter ContactNumber: ");
long contactNumber = sc.nextLong();
A.add(new Student(name, id, dept, cgpa, address, age, contactNumber));
}
output = new ObjectOutputStream(new FileOutputStream(file));
output.writeObject(A);
output.close();
break;
case 2:
try {
input = new ObjectInputStream(new FileInputStream(file));
A = (ArrayList<Student>) input.readObject();
input.close();
System.out.println("---------------------------------");
list = A.listIterator();
while (list.hasNext()) {
System.out.println(list.next());
}
System.out.println("---------------------------------");
} catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
}
break;
case 3:
try {
input = new ObjectInputStream(new FileInputStream(file));
A = (ArrayList<Student>) input.readObject();
input.close();
boolean found = false;
System.out.println("How many Students: ");
int n3 = sc.nextInt();
for (int i = 0; i < n3; i++) {
System.out.println("Enter Student's Id To Search:");
String id = sc.next();
System.out.println("-------------------");
list = A.listIterator();
while (list.hasNext()) {
Student S = list.next();
if (S.id.equals(id)) {
System.out.println(S);
found = true;
}
}
}
if (!found) {
System.out.println("Data not found");
}
System.out.println("-------------------");
} catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
}
break;
case 4:
try {
input = new ObjectInputStream(new FileInputStream(file));
A = (ArrayList<Student>) input.readObject();
input.close();
boolean found = false;
System.out.println("How many Students: ");
int n1 = sc.nextInt();
for (int j = 0; j < n1; j++) {
System.out.println("Enter Student's Id To Delete:");
String id = sc.next();
System.out.println("-------------------");
list = A.listIterator();
while (list.hasNext()) {
Student S = list.next();
if (S.id.equals(id)) {
list.remove();
found = true;
}
}
}
if (found) {
output = new ObjectOutputStream(new FileOutputStream(file));
output.writeObject(A);
output.close();
System.out.println("Delete Successful");
} else {
System.out.println("Data not found");
}
System.out.println("-------------------");
} catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
}
break;
case 5:
try {
input = new ObjectInputStream(new FileInputStream(file));
A = (ArrayList<Student>) input.readObject();
input.close();
boolean found = false;
System.out.println("How many Students: ");
int n2 = sc.nextInt();
for (int k = 0; k < n2; k++) {
System.out.println("Enter Student's Id to Update:");
String id = sc.next();
System.out.println("-------------------");
list = A.listIterator();
while (list.hasNext()) {
Student S = list.next();
if (S.id.equals(id)) {
System.out.println("Enter new Name: ");
String new_name = sc.next();
System.out.println("Enter new Id: ");
String new_id = sc.next();
System.out.println("Enter new Department: ");
String new_dept = sc.next();
System.out.println("Enter new Cgpa: ");
float new_cgpa = sc.nextFloat();
System.out.println("Enter new Address: ");
String new_address = sc.next();
System.out.println("Enter new Age: ");
int new_age = sc.nextInt();
System.out.println("Enter new ContactNumber: ");
long new_contactNumber = sc.nextLong();
list.set(new Student(new_name, new_id, new_dept, new_cgpa, new_address, new_age, new_contactNumber));
found = true;
}
}
}
if (found) {
output = new ObjectOutputStream(new FileOutputStream(file));
output.writeObject(A);
output.close();
System.out.println("Data Updated Successfully");
} else {
System.out.println("Data not found");
}
System.out.println("-------------------");
} catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
}
break;
case 0:
System.out.println("Exiting the System");
System.exit(0);
break;
default:
System.out.println("Wrong choice of Number!!");
System.out.println("Try Again!");
}
} while (choice != 0);
c = 1;
} else {
System.out.println("Wrong Information");
System.out.println("Please ReEnter username and password again!!");
System.out.print("Enter Username: ");
user = sc.next();
System.out.print("Enter password: ");
pass = sc.nextInt();
}
}
}
}
class Student implements Serializable {
String name, id, dept, address;
float cgpa;
int age;
long contactNumber;
public Student(String name, String id, String dept, float cgpa, String address, int age, long contactNumber) {
this.name = name;
this.id = id;
this.dept = dept;
this.cgpa = cgpa;
this.address = address;
this.age = age;
this.contactNumber = contactNumber;
}
@Override
public String toString() {
return "Name: " + name + "\nID: " + id + "\nDepartment: " + dept + "\nCGPA: " + cgpa +
"\nAddress: " + address + "\nAge: " + age + "\nContact Number: " + contactNumber;
}
}
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