获取json数组中的最后一个元素

Question

如何获取seat对象中json数组中的最后一个元素。我想获得值为845的countryid，但是这个json是动态的，所以我想获得seat对象中的最后一个元素。我的api是这样构造的。先感谢您。

{
"expirationDate":"April 21, 2017",
"remainingDays":325,
"seats":[{"activeStatus":"S","pid":"TE70","firstName":"TE70","countryid":840},
        {"activeStatus":"Y","pid":"TE80","firstName":"TE80","countryid":845}]
 }

Answer 1

您可以通过索引访问jsonData.seats数组，最后一项的索引等于jsonData.seats.length-1

来执行此操作

简单地：

var countryId = jsonData.seats[jsonData.seats.length-1].countryid

Answer 2

试试这个：

var jsonObject = {
"expirationDate":"April 21, 2017",
"remainingDays":325,
"seats":[{"activeStatus":"S","pid":"TE70","firstName":"TE70","countryid":840},
        {"activeStatus":"Y","pid":"TE80","firstName":"TE80","countryid":845}]
 }

var lastElement = jsonObject.seats[jsonObject.seats.length-1].countryid

Answer 3

我使用了上面的建议，并将其用于GSON lib中的JsonElement对象循环中。以防万一有人在找我做的同样的事情。

         for (JsonElement obj : entries){
             
           //Do your stuff
            
           if (entries.get(entries.size() - 1).equals(obj)){
              //Do stuff if your in last position of the jsonarray array
           }else{
              //Do stuff until you reach the last position
           }
           
         }