java - Adding several JSONObject into one but not as an array -

i working on java api , need format data json. want following structure :

{    "main": {             "point1": {               "x": 0.18,               "y": 10.8,               "z": 0             },             "point2": {               "x": 0.18,               "y": 9.36,               "z": 0             },             "point3": {               "x": 0.18,               "y": 8.46,               "z": 0             },             "point4": {               "x": 0.18,               "y": 7.38,               "z": 0             }     } } 

basically there list of points in "main" jsonobject object don't want array.

jsonobject main = new jsonobject();  for(point p : points){     jsonobject point = new jsonobject();     jsonobject coordinates = new jsonobject();     coordinates.put("x", p.getx());     coordinates.put("y", p.gety());     coordinates.put("z", p.getz());     point.put(p.getname(),coordinates);     main.put("main", point); } 

i following result code above :

{    "main": {             "point4": {               "x": 0.18,               "y": 7.38,               "z": 0             }     } } 

the put method use on last line overwritting previous points, got 1 point in main object @ end. guess solution problem trivial i'm unable find it.
me ?

you there.

accumulate points single json object adding each point separate field:

jsonobject main = new jsonobject();  list<point> points = new arraylist<>(); points.add(new point("point1", 1, 2, 3)); points.add(new point("point2", 2, 3, 4));  jsonobject pointsasjson = new jsonobject(); (point p : points) {     jsonobject coordinates = new jsonobject();     coordinates.put("x", p.getx());     coordinates.put("y", p.gety());     coordinates.put("z", p.getz());     pointsasjson.put(p.getname(), coordinates); }  main.put("main", pointsasjson); 

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