如何在Java 9的JShell中实现封装概念？

<strong>jshell> class Employee {
...>       private String firstName;
...>       private String lastName;
...>       private String designation;
...>       private String location;
...>       public Employee(String firstName, String lastName, String designation, String location) {
...>          this.firstName = firstName;
...>          this.lastName = lastName;
...>          this.designation = designation;
...>          this.location = location;
...>       }
...>      public String getFirstName() {
...>         return firstName;
...>      }
...>      public String getLastName() {
...>         return lastName;
...>      }
...>      public String getJobDesignation() {
...>         return designation;
...>      }
...>      public String getLocation() {
...>         return location;
...>      }
...>      public String toString() {
...>         return "Name = " + firstName + ", " + lastName + " | " +
...>                "Job designation = " + designation + " | " +
...>                "location = " + location + ".";
...>      }
...> }
| created class Employee</strong>

<strong>jshell> Employee emp = new Employee("Jai", "Adithya", "Content Developer", "Hyderabad");
emp ==> Name = Jai, Adithya | Job designation = Content Developer | location = Hyderabad.</strong>