How to iterate over this json array in java

Question

["[{\"timeFrom\":\"06:00:00\",\"timeTo\":\"09:00:00\",\"title\":\"First\"},{\"timeFrom\":\"09:00:00\",\"timeTo\":\"12:00:00\",\"title\":\"Second\"},{\"timeFrom\":\"12:00:00\",\"timeTo\":\"16:00:00\",\"title\":\"Third\"},{\"timeFrom\":\"16:00:00\",\"timeTo\":\"20:00:00\",\"title\":\"Fourth\"},{\"timeFrom\":\"20:00:00\",\"timeTo\":\"21:30:00\",\"title\":\"5th\"},{\"timeFrom\":\"21:30:00\",\"timeTo\":\"00:00:00\",\"title\":\"Dessert (within two hours of bedtime)th\"}]"]

I got this array when I log JSONArray. How can I iterate over it and get those values ?

edit

for (int i = 0; i < MyService.Meals.length(); ++i) { 
JSONObject rec = MyService.Meals.getJSONObject(i); String text = rec.getString("timeFrom"); 
}

Doesn't return anything because MyService.Meals.length() = 1.

MyService.Meals is JSONArray instance

Try the examples on this page? stackoverflow.com/questions/3408985/… — Klazen108
– Klazen108, Commented Nov 14, 2013 at 21:17
Your JSON string looks malformed, the outer square brackets are surrounding one string, so of course the length of the array is one. — Klazen108
– Klazen108, Commented Nov 14, 2013 at 21:25
Remove the [" and "] from the outside of the string, and then remove all the `` in front of the quotes, and see what happens then — Klazen108
– Klazen108, Commented Nov 14, 2013 at 21:27

Klazen108 · Accepted Answer · 2013-11-15 18:23:58Z

The issue arises because the format of your array is as follows:

[
  "[{\"timeFrom\":\"06:00:00\",\"timeTo\":\"09:00:00\",\"title\":\"First\"},{\"timeFrom\":\"09:00:00\",\"timeTo\":\"12:00:00\",\"title\":\"Second\"},{\"timeFrom\":\"12:00:00\",\"timeTo\":\"16:00:00\",\"title\":\"Third\"},{\"timeFrom\":\"16:00:00\",\"timeTo\":\"20:00:00\",\"title\":\"Fourth\"},{\"timeFrom\":\"20:00:00\",\"timeTo\":\"21:30:00\",\"title\":\"5th\"},{\"timeFrom\":\"21:30:00\",\"timeTo\":\"00:00:00\",\"title\":\"Dessert (within two hours of bedtime)th\"}]"
]

Which is an array of size one, with one string as its content.

You are expecting the array inside the string that has been string-encoded, which should look like this:

[
  {
    "timeFrom": "06: 00: 00",
    "timeTo": "09: 00: 00",
    "title": "First"
  },
  {
    "timeFrom": "09: 00: 00",
    "timeTo": "12: 00: 00",
    "title": "Second"
  },
  {
    "timeFrom": "12: 00: 00",
    "timeTo": "16: 00: 00",
    "title": "Third"
  },
  {
    "timeFrom": "16: 00: 00",
    "timeTo": "20: 00: 00",
    "title": "Fourth"
  },
  {
    "timeFrom": "20: 00: 00",
    "timeTo": "21: 30: 00",
    "title": "5th"
  },
  {
    "timeFrom": "21: 30: 00",
    "timeTo": "00: 00: 00",
    "title": "Dessert(withintwohoursofbedtime)th"
  }
]

Inspect the Javascript code, it seems like there is a section that is wrapping the array you want inside a string and putting that in another array. Inspect for an unnecessary call to JSON.stringify()

qwertynl · Accepted Answer · 2013-11-14 21:11:46Z

0

You have to parse the json object to a Java object, then you can read the data.

See the JSON DOC for a list of functions you can use in Java.

answered Nov 14, 2013 at 21:11

qwertynl

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3 Comments

Dusan Malic Over a year ago

I have already tried something like this:

for (int i = 0; i < MyService.Meals.length(); ++i) { JSONObject rec = MyService.Meals.getJSONObject(i); String text = rec.getString("timeFrom"); }

but don't work and I am not sure why

qwertynl Over a year ago

And what was the result @DusanMalic ?

Dusan Malic Over a year ago

I tried to log it but it would't log, and than I saw that MyService.Meals.length() (that is json object) is 1, but I have no idea why...

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