如何检查json数组是否有任何值? [英] How to check if json array has any value?

问题描述

我正在使用条件-

if (!obj2.getString("patronCheckoutInfo").equals("null")) {

但是在数组获得值的情况下它不起作用.

But it does not work for the case when array got the value.

例如:案例1，当json获得"patronCheckoutInfo"的值时:

Eg: Case1- when json got value for "patronCheckoutInfo":

{
"ErrorMessage": ""
"Message": "Operation completed successfully"
"Status": "OK"
"Results": {
"LookupPatronInfoResponse": {
"patronAddressInfo": null
"patronCheckoutHistoryInfo": null
"patronCheckoutInfo": [6]
0:  {
"author": "Cobb, Kevin."

情况2-无值时:

{
"ErrorMessage": ""
"Message": "Operation completed successfully"
"Status": "OK"
"Results": {
"LookupPatronInfoResponse": {
"patronAddressInfo": null
"patronCheckoutHistoryInfo": null
"patronCheckoutInfo": null
"patronCirculationInfo": null

尝试了一些教程，但无法弄清楚.任何建议都欢迎.预先感谢.

Tried few tutorials but unable to figure out. Any suggestion is welcome. Thanks in advance.

推荐答案

谢谢大家的建议.下面为我​​工作:

Thanks all for the suggestion. Below worked for me:

if (obj2.getString("patronCheckoutInfo") != null)

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