在Java 9的JShell中如何導入gson函式庫？

Java 9 引入了一個互動式REPL 命令列工具，名稱為JShell。它允許我們執行Java程式碼片段並立即獲得結果。我們可以導入可以從JShell會話中存取的外部類，透過類路徑。 Gson庫是一個Java序列化/反序列化庫，用於將Java物件轉換為JSON，反之亦然。

在下面的程式碼片段中，我們可以在JShell中設定類別路徑

<strong>jshell> /env --class-path C:\Users\User\gson.jar
| Setting new options and restoring state.</strong>

一旦我們在JShell中導入了 gson 庫 ，就能在清單中看到該庫。

<strong>jshell> import com.google.gson.*

jshell> /import
| import java.io.*
| import java.math.*
| import java.net.*
| import java.nio.file.*
| import java.util.*
| import java.util.concurrent.*
| import java.util.function.*
| import java.util.prefs.*
| import java.util.regex.*
| import java.util.stream.*
| import com.google.gson.*

jshell> Gson g = new GsonBuilder().setPrettyPrinting().create()
g ==> {serializeNulls:false,factories:[Factory[typeHier ... 78b9],instanceCreators:{}}</strong>

在下面的程式碼片段中，我們建立了一個Employee 類別。

<strong>jshell> class Employee {
...>       private String firstName;
...>       private String lastName;
...>       private String designation;
...>       private String location;
...>       public Employee(String firstName, String lastName, String desigation, 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

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

jshell> String empSerialized = g.toJson(e)
empSerialized ==> "{\n \"firstName\": \"Jai\",\n \"lastName\": \" ... ation\": \"Hyderabad\"\n}"</strong>

在下面的程式碼片段中，我們可以建立一個Employee 物件的實例並顯示結果。

<strong>jshell> System.out.println(empSerialized)
{
   "firstName": "Jai",
   "lastName": "Adithya",
   "designation": "Content Developer",
   "location": "Hyderabad"
}
jshell> Employee e1 = g.fromJson(empSerialized, Employee.class)
e1 ==> Name = Jai, Adithya | Job designation = Content D ... er | location = Hyderabad.</strong>

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