Write a java program that writes objects of Employee class in the file named emp.doc. Create Employee class as of your interest.

• Create an Employee class (with attributes of your choice),
• Serialize and write its objects to a file named emp.doc.

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✅ 1. Employee.java

import java.io.Serializable;

// Employee class with Serializable interface
public class Employee implements Serializable {
    private int id;
    private String name;
    private double salary;

    // Constructor
    public Employee(int id, String name, double salary) {
        this.id = id;
        this.name = name;
        this.salary = salary;
    }

    // Getters (Optional: Add setters if needed)
    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public double getSalary() {
        return salary;
    }

    // toString method for easy display
    @Override
    public String toString() {
        return "Employee [ID=" + id + ", Name=" + name + ", Salary=" + salary + "]";
    }
}

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✅ 2. WriteEmployeeToFile.java

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

public class WriteEmployeeToFile {
    public static void main(String[] args) {
        // Create a few Employee objects
        Employee emp1 = new Employee(101, "Alice", 50000);
        Employee emp2 = new Employee(102, "Bob", 60000);
        Employee emp3 = new Employee(103, "Charlie", 55000);

        try {
            // File name is emp.doc (you can change extension if needed)
            FileOutputStream fileOut = new FileOutputStream("emp.doc");
            ObjectOutputStream out = new ObjectOutputStream(fileOut);

            // Write employee objects
            out.writeObject(emp1);
            out.writeObject(emp2);
            out.writeObject(emp3);

            out.close();
            fileOut.close();
            System.out.println("Employee objects have been written to emp.doc");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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🔄 Optional: Reading Back (For Testing)

If you want to read back the objects to verify:

import java.io.FileInputStream;
import java.io.ObjectInputStream;

public class ReadEmployeeFromFile {
    public static void main(String[] args) {
        try {
            FileInputStream fileIn = new FileInputStream("emp.doc");
            ObjectInputStream in = new ObjectInputStream(fileIn);

            Employee e1 = (Employee) in.readObject();
            Employee e2 = (Employee) in.readObject();
            Employee e3 = (Employee) in.readObject();

            in.close();
            fileIn.close();

            System.out.println(e1);
            System.out.println(e2);
            System.out.println(e3);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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⚠ Notes:

• Make sure Employee class implements Serializable.
• You can store objects in ArrayList<Employee> and serialize the list instead if you're writing many employees at once.