1String jsonString = new JSONObject()
2                  .put("JSON1", "Hello World!")
3                  .put("JSON2", "Hello my World!")
4                  .put("JSON3", new JSONObject().put("key1", "value1"))
5                  .toString();
6
7System.out.println(jsonString);
8

1String json = Json.createObjectBuilder()
2            .add("key1", "value1")
3            .add("key2", "value2")
4            .build()
5            .toString();
6