在Java 9的JShell中如何导入gson库？

Java 9 引入了一个交互式REPL 命令行工具，名为JShell。它允许我们执行Java代码片段并立即获得结果。我们可以导入可以从JShell会话中访问的外部类，通过类路径。 Gson库是一个Java序列化/反序列化库，用于将Java对象转换为JSON，反之亦然。

在下面的代码片段中，我们可以在JShell中设置类路径

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

一旦我们在JShell中导入了gson 库 ，就能在列表中看到该库。

<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>

在下面的代码片段中，我们创建了一个Employee 类。

<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>

在下面的代码片段中，我们可以创建一个Employee 对象的实例并显示结果。

<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>

以上就是在Java 9的JShell中如何导入gson库？的详细内容，更多请关注其它相关文章！