如何在Java 9的JShell中实现封装概念？

Java Shell (简称JShell) 是一个用于学习Java和原型化Java代码的REPL交互工具。它会评估输入的声明、语句和表达式，并立即打印出结果并从命令行运行。

封装是Java中的一个重要概念，用于确保“敏感”数据对用户隐藏。为了实现这一点，我们必须将类变量声明为私有，并提供公共访问get和set方法以及更新私有变量的值。

在下面的代码片段中，我们已经为Employee类实现了封装概念。

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

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在下面的代码片段中，我们创建了一个Employee类的实例，并打印出name、designation和location。

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