how to lose your code with git checkout

src/l2a/employees/Employee.java

@@ -1,35 +1,6 @@
 package l2a.employees;
 
-public class Employee {
-    String ID;
-    String name;
-    String department;
-    int salary;
-    int bonus_salary;
-
-    public Employee (String ID, String name, String department, int salary, int bonus_salary) {
-        this.ID = ID;
-        this.name = name;
-        this.department = department;
-        this.salary = (salary);
-        this.bonus_salary = (bonus_salary);
-    }
-
-    public String getID() {
-        return ID;
-    }   
-    public String getName() {
-        return name;
-    }
-    public String getDepartment() {
-        return department;
-    }
-    public int getSalary() {
-        return salary;
-    }
-    public int getBonusSalary() {
-        return bonus_salary;
-    }   
+public record Employee(String ID, String name, String department, int salary, int bonus_salary) {
     public String funny() {
         return ID + " " + name + " " + department + " " + salary + " " + bonus_salary;
     }

src/l2a/employees/EmployeeFileRead.java

@@ -74,10 +74,10 @@ public class EmployeeFileRead {
         int ind = 1;
         for (Employee employee : employees) {
             System.out.println("\nEmployee " + ind++);
-            System.out.println("ID: " +employee.getID());
-            System.out.println("Name: " +employee.getName());
-            System.out.println("Department: " +employee.getDepartment() );
-            double inc = employee.getSalary() + employee.getBonusSalary() * 2.5;
+            System.out.println("ID: " +employee.ID());
+            System.out.println("Name: " +employee.name());
+            System.out.println("Department: " +employee.department() );
+            double inc = employee.salary() + employee.bonus_salary() * 2.5;
             System.out.println("Income: " + inc);
         }
     }