<strong><span style="font-size:24px;color:#ff0000;">建立User類：</span></strong>

package lgson;

import java.util.ArrayList;
import java.util.HashMap;

/*
 * 自定義一個User類
 * 
 * */
public class User {
	public int id;
	public String Name;
	public int age;
	public ArrayList<String> books;
	public HashMap<String, String> booksMap;
	public String email;
}
 

<span style="font-size:24px;color:#ff0000;"><strong>測試類：</strong></span>

package lgson_get_test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import com.google.gson.Gson;


public class Get_Test{
		public static void main(String [] args){
		Gson gson = new Gson();
		User user = new User();
		user.id = 1;
		user.Name = "陳鄭遊";
		user.age = 22;
		user.email = "
 
[email protected]";			
		System.out.println("第一次輸出JSON資料：" + gson.toJson(user) + "\n");
		
		List<String> books = new ArrayList<String>();
		books.add("數學");  
        books.add("語文");  
        books.add("英語");  
        books.add("物理");  
        books.add("化學");  
        books.add("生物");  
		user.books=(ArrayList<String>) books;
		System.out.println("第二次輸出JSON資料：" + gson.toJson(user));
		
		HashMap<String, String> booksMap = new HashMap<String, String>();
		//map.put(key, value);
		booksMap.put("1", "數學");  
        booksMap.put("2", "語文");  
        booksMap.put("3", "英語");  
        booksMap.put("4", "物理");  
        booksMap.put("5", "化學");  
        booksMap.put("6", "生物");  
        user.booksMap=booksMap;
        System.out.println("第三次輸出JSON資料：" + gson.toJson(user) + "\n");
        
		String string = new String();
		//輸出的字串使用Gson轉換成User物件
		string.format(string, User.class);
		
		System.out.println("類名：" + user.getClass());
		System.out.println("年齡：" + user.age);
		System.out.println("名字：" + user.Name);
		System.out.println("郵箱：" +user.email);
		System.out.println("books:" + user.books);
		System.out.println("books size :" + user.books.size());
		System.out.println("booksMap:" + user.booksMap);

	    }
}