Java Shell (簡稱JShell) 是用於學習Java和原型化Java程式碼的REPL互動工具。它會評估輸入的宣告、語句和表達式，並立即列印出結果並從命令列運行。
封裝是Java中的重要概念，用於確保「敏感」資料對使用者隱藏。為了實現這一點，我們必須將類別變數宣告為私有，並提供公共存取get和set方法以及更新私有變數的值。
在下面的程式碼片段中，我們已經為Employee類別實作了封裝概念。
<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>在下面的程式碼片段中，我們建立了一個Employee類別的實例，並列印出name、designation和location。
<strong>jshell> Employee emp = new Employee("Jai", "Adithya", "Content Developer", "Hyderabad");
emp ==> Name = Jai, Adithya | Job designation = Content Developer | location = Hyderabad.</strong>以上是如何在Java 9的JShell中實作封裝概念？的詳細內容。更多資訊請關注PHP中文網其他相關文章！
