How to implement the encapsulation concept in JShell in Java 9?

Java Shell (simply JShell) is a REPL interactive tool for learning the Java and prototyping Java code. It evaluates declarations, statements, and expressions as entered and immediately prints out the result and runs from the command-line.

Encapsulation is an important concept in Java to make sure that "sensitive" data has been hidden from users. To achieve this, we must declare a class variable as private and provides public access to get and set methods and update the value of a private variable.

In the below code snippet, we have implemented the Encapsulation concept for Employee class.

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

In the below code snippet, we have created an instance of Employee class, and it prints out a name, designation, and location.

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