如何将项目追加到现有的json数组中？下面是我的json数组

[
  {
    "id": 1,
    "name": "项目1"
  },
  {
    "id": 2,
    "name": "项目2"
  }
]

{
  "id": 3,
  "name": "项目3"
}

var existingArray = [
  {
    "id": 1,
    "name": "项目1"
  },
  {
    "id": 2,
    "name": "项目2"
  }
];

var newItem = {
  "id": 3,
  "name": "项目3"
};

existingArray.push(newItem);

import json

existingArray = [
  {
    "id": 1,
    "name": "项目1"
  },
  {
    "id": 2,
    "name": "项目2"
  }
]

newItem = {
  "id": 3,
  "name": "项目3"
}

existingArray.append(newItem)

import com.google.gson.Gson;

class Project {
  int id;
  String name;
}

public class Main {
  public static void main(String[] args) {
    String existingJsonArray = "[{\"id\": 1, \"name\": \"项目1\"}, {\"id\": 2, \"name\": \"项目2\"}]";
    Gson gson = new Gson();
    Project[] existingArray = gson.fromJson(existingJsonArray, Project[].class);

    Project newItem = new Project();
    newItem.id = 3;
    newItem.name = "项目3";

    Project[] newArray = Arrays.copyOf(existingArray, existingArray.length + 1);
    newArray[newArray.length - 1] = newItem;

    String updatedJsonArray = gson.toJson(newArray);
    System.out.println(updatedJsonArray);
  }
}

[
  {
    "id": 1,
    "name": "项目1"
  },
  {
    "id": 2,
    "name": "项目2"
  },
  {
    "id": 3,
    "name": "项目3"
  }
]