Parse Json Array java

Question

i try to parse JSON array with format from file like this

> [
  {
    "Absensi": 20,
    "Tunjangan Makan": 400000,
    "name": "asdasd",
    "ID": 1,
    "Gaji Total": 5400000,
    "Gaji Pokok": 5000000,
    "email": [
      "asdasd",
      "asdas"
    ]
  },
  {
    "Absensi": 20,
    "Tunjangan Makan": 400000,
    "name": "jasnen",
    "ID": 2,
    "Gaji Total": 5400000,
    "Gaji Pokok": 5000000,
    "email": [
      "asdasd",
      "asdasda"
    ]
  }
]

here is my code:

public static void readJsonFileManager(String file) throws ParseException, FileNotFoundException, IOException{
    JSONParser parser = new JSONParser();
    Reader reader = new FileReader(file);

    Object jsonObj ;
    jsonObj =   parser.parse(reader);

    JSONObject jsonObject = (JSONObject) jsonObj;
    while(jsonObj != null) {
        long ID = (long) jsonObject.get("ID");
        System.out.println("ID = " + ID);
        String name = (String) jsonObject.get("name");
        System.out.println("Name = " + name);
        long Absensi = (long) jsonObject.get("Absensi");
        System.out.println("Absensi = " + Absensi);
        long GajiPokok = (long) jsonObject.get("Gaji Pokok");
        System.out.println("GajiPokok = " + GajiPokok);
        long GajiTotal = (long) jsonObject.get("Gaji Total");
        System.out.println("GajiTotal = " + GajiTotal);
        long Tunjangan = (long) jsonObject.get("Tunjangan Makan");
        System.out.println("Tunjangan Makan= " + Tunjangan + "\n");
        jsonObj =   parser.parse(reader);
    }

But when i run it it show error bracket on my terminal is there something wrong with my code, i cannot find any post relate to my problem??

Exception in thread "main" java.lang.ClassCastException: class org.json.simple.JSONArray cannot be cast to class org.json.simple.JSONObject (org.json.simple.JSONArray and org.json.simple.JSONObject are in unnamed module of loader 'app')
at com.company.DemoKerja.readJsonFileManager(DemoKerja.java:230)
at com.company.DemoKerja.main(DemoKerja.java:71)

it seems like the method cannot read and print out the data because it has more than one data in the JSON file... — user16226061
– user16226061, Commented Jun 15, 2021 at 7:44
Is the > really part of the JSON? Because that's not a valid format. And if it isn't, then the top-level element of your JSON is an array, not an object, so you need to loop over it's members and NOT call parse repeatedly. — Joachim Sauer
– Joachim Sauer, Commented Jun 15, 2021 at 7:45
@Jansen Stanlie could it be that JSONObject is matching {} instead of []? - can you try iterating a JSONArray instead? — thinkgruen
– thinkgruen, Commented Jun 15, 2021 at 7:48

bradley101 · Accepted Answer · 2021-06-15 07:48:25Z

2

Instead of taking it in JSONObject, parse it in JSONArray.

JSONArray array = new JSONArray(jsonObject);

while (array.hasNext()) {
    JSONObject obj = array.next();
    System.out.println(obj.get("ID"));
}

answered Jun 15, 2021 at 7:48

bradley101

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3 Comments

user16226061 Over a year ago

my intellij show problem when i put array.hasNext

user16226061 Over a year ago

'JSONArray()' in 'org.json.simple.JSONArray' cannot be applied to '(java.lang.Object)'

bradley101 Over a year ago

@JansenStanlie You need to provide JSONObject in the constructor, not Object

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