how to iterate through json objects in java

Question

I am trying to iterate through my json file and get required details here is my json

{
\"000\": {
    \"component\": \"c\",
    \"determinantType\": \"dt\",         


        

Answer 1

There's not a JSONArray, only a few JSONObjects. Iterate the keys of the main JSONObject with JSONObject.keys().

public static final String COMPONENT = "component";
public static final String DT = "determinantType";
public static final String D = "determinant": "d";
public static final String HEADER = "header";
public static final String DV = "determinantvalue";

JSONObject jso = getItFromSomewhere();
for (Object key : jso.keys()) {
    JSONObject subset = jso.getJSONObject(key);
    String d = subset.getString(D);
    String header = subset.getString(HEADER);
    String dv = subset.getString(DV);
    System.out.println(key + " " + header + " " + d + " " + dv);
}

Answer 2

try this...

FileReader file = new FileReader("test.json");
Object obj = parser.parse(file);
System.out.println(obj);
JSONObject jsonObject = (JSONObject) obj;            

Iterator<String> iterator = jsonObject .iterator();  

for(Iterator iterator = jsonObject.keySet().iterator(); iterator.hasNext();) {
    String key = (String) iterator.next();
    System.out.println(jsonObject.get(key));
}

Answer 3

You don't have an array - you have properties with names of "000" etc. An array would look like this:

"array": [ {
    "foo": "bar1",
    "baz": "qux1"
  }, {
    "foo": "bar2",
    "baz": "qux2"
  }
]

Note the [ ... ] - that's what indicates a JSON array.

You can iterate through the properties of a JSONObject using keys():

// Unfortunately keys() just returns a raw Iterator...
Iterator keys = jsonObject.keys();
while (keys.hasNext()) {
    Object key = keys.next();
    JSONObject value = jsonObject.getJSONObject((String) key);
    String component = value.getString("component");
    System.out.println(component);
}

Or:

@SuppressWarnings("unchecked")
Iterator<String> keys = (Iterator<String>) jsonObject.keys();
while (keys.hasNext()) {
    String key = keys.next();
    JSONObject value = jsonObject.getJSONObject(key);
    String component = value.getString("component");
    System.out.println(component);
}