我正在使用嵌套JSON数组。如下所示，“booking_status”数组中有多个数组，我只想在表中显示当前时间内的数组。

所以，使用filter（）方法，我尝试将当前时间与每个数组签入和签出日期/时间进行比较。如果当前时间介于这两个值之间，则只应在表中返回该数组的详细信息，否则返回字符串“nothing”。我写了下面的代码，但它们不返回值。我不确定我做错了什么，请注意我对Java非常陌生，还在从教程中学习。

JSON数组:

[
    {
        "id": 2,
        "item_name": "Rose Red",
        "author": "Stephen King",
        "booking_status": [
            {
                "check_in": "2021-09-22T08:27:00+04:00",
                "check_out": "2021-09-23T08:27:00+04:00",
                "status": "Currently Booked"
            },
            {
                "check_in": "2021-09-25T08:37:00+04:00",
                "check_out": "2021-09-26T08:37:00+04:00",
                "status": "Currently Free"
            },
            {
                "check_in": "2021-09-27T08:37:00+04:00",
                "check_out": "2021-09-28T08:37:00+04:00",
                "status": "Currently Free"
            },
            {
                "check_in": "2021-09-22T08:27:00+04:00",
                "check_out": "2021-09-23T08:27:00+04:00",
                "status": "Currently Booked"
            },
            {
                "check_in": "2021-09-25T08:37:00+04:00",
                "check_out": "2021-09-26T08:37:00+04:00",
                "status": "Currently Free"
            }
        ]
    }
]

脚本:

[
    {
        "id": 2,
        "item_name": "Rose Red",
        "author": "Stephen King",
        "booking_status": [
            {
                "check_in": "2021-09-22T08:27:00+04:00",
                "check_out": "2021-09-23T08:27:00+04:00",
                "status": "Currently Booked"
            },
            {
                "check_in": "2021-09-25T08:37:00+04:00",
                "check_out": "2021-09-26T08:37:00+04:00",
                "status": "Currently Free"
            },
            {
                "check_in": "2021-09-27T08:37:00+04:00",
                "check_out": "2021-09-28T08:37:00+04:00",
                "status": "Currently Free"
            },
            {
                "check_in": "2021-09-22T08:27:00+04:00",
                "check_out": "2021-09-23T08:27:00+04:00",
                "status": "Currently Booked"
            },
            {
                "check_in": "2021-09-25T08:37:00+04:00",
                "check_out": "2021-09-26T08:37:00+04:00",
                "status": "Currently Free"
            }
        ]
    }
]

顺晟科技：

1. 即使您已经筛选出所需的对象并将其存储在其中，但您没有在您的变量中使用该变量，因此您看不到筛选的结果。改用以下方式:

2. 在数组中是string类型，而在filter方法中是将它们与类型进行比较。要解决此问题，请将check_in和check_out转换为that

3. 要有条件地打印所有数据或“无”，还必须通过检查筛选数组的长度来有条件地构建字符串。如果这个数组的长度为零，我们可以说没有数据