Task has been done.

Main.java

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+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.Scanner;
+
+class Employee {
+    private String name;
+    private String mail;
+    private int age;
+    private int salary;
+
+    // Getter methods
+    public String getName() {
+        return name;
+    }
+
+    public String getMail() {
+        return mail;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public int getSalary() {
+        return salary;
+    }
+
+    // Setter methods
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setMail(String mail) {
+        this.mail = mail;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public void setSalary(int salary) {
+        this.salary = salary;
+    }
+
+    // Method to write employee data to file
+    public void employee_data() {
+        try {
+            if (salary <= 20000) {
+                FileWriter employee_data = new FileWriter("employees.txt", true);
+                employee_data.write(name + " " + mail + " " + age + " " + salary + "\n");
+                employee_data.close();
+            } else {
+                System.out.println("The Salary is more than the limit. Please enter again.");
+            }
+        } catch (IOException e) {
+            System.out.println("An error occurred.");
+            e.printStackTrace();
+        }
+    }
+}
+
+public class Main {
+    public static void main(String[] args) {
+        Employee data_pass = new Employee();
+        Scanner emp_data = new Scanner(System.in);
+
+        int i = 0;
+        while (i < 10) {
+            System.out.println("Please enter your name: ");
+            String name_data = emp_data.nextLine();
+
+            System.out.println("Please enter your email: ");
+            String mail_data = emp_data.nextLine();
+
+            System.out.println("Age: ");
+            int age_data = emp_data.nextInt();
+
+            System.out.println("Salary: ");
+            int salary_data = emp_data.nextInt();
+
+            emp_data.nextLine();
+
+            // Setting employee data using setter methods
+            data_pass.setName(name_data);
+            data_pass.setMail(mail_data);
+            data_pass.setAge(age_data);
+            data_pass.setSalary(salary_data);
+
+            // Writing employee data to file
+            data_pass.employee_data();
+            i++;
+        }
+
+        emp_data.close();
+    }
+}