Net.sf.json-put, accumulate, element

Net.sf.json the jar required:

Note the version, which conflicts between some versions.

Package Com.ikoo;import Net.sf.json.json;import Net.sf.json.jsonarray;import Net.sf.json.jsonobject;public class        Testjson {public static void main (string[] args) {Jsonobject jsonobject = new Jsonobject ();        Jsonarray Jsonarray = new Jsonarray (); /** * Public Object put (object key, Object value) * Maps value to key * If there is a value before this Jsonobject object in this K        EY, the current value will replace the previous value */Jsonobject.put ("One", "first");        Jsonobject: {"One": "First"} System.out.println ("Jsonobject:" + jsonobject.tostring ());        Jsonobject.put ("Both", "second");        Jsonobject: {"One": "First", "One": "Second"} System.out.println ("Jsonobject:" + jsonobject.tostring ());        Jsonobject.put ("Both", "cover");        Jsonobject: {"One": "First", "One": "Cover"} System.out.println ("Jsonobject:" + jsonobject.tostring ()); Jsonobject.put ("one", null);//value is NULL, directly remove key//Jsonobject: {"One": "Cover"} SystEm.out.println ("Jsonobject:" + jsonobject.tostring ()); /** * Public jsonobject accumulate (String key, Object value) * Accumulate value under this key * 1. If a value is already present in the         Under this key, then there will be a jsonarray stored in this key down to save all accumulated value * 2. If a jsonarray already exists, the current value is added to this jsonarray *        */Jsonobject Jsonobj = new Jsonobject ();        Jsonobj.accumulate ("Servers", null);//allow value to be null jsonobj.accumulate ("Servers", "Tomcat");        Jsonobj.put ("Codes", "Java");        Jsonobj.accumulate ("Codes", "JavaScript"); Jsonobj: {"Servers": [NULL, "Tomcat"], "Codes": ["Java", "JavaScript"]} System.out.println ("Jsonobj:" + jsonobj.tost        Ring ());        /** * Public jsonobject Element (String key, Object value) */Jsonobject object = new Jsonobject ();        Object.element ("Price", "500");        Object.element ("Price", "1000"); Object: {"Price": "1000"} question: What is the difference between this and put???        Well, it would call accumulate??? System.out.println ("ObjeCT: "+ object.tostring ()); }}

Console printing:

Jsonobject: {"One": "First"}jsonobject: {"One": "First", "One": "Second"}jsonobject: {"One": "First", "One": "Cover"} Jsonobject: {"A": "Cover"}jsonobj: {"Servers": [NULL, "Tomcat"], "Codes": ["Java", "JavaScript"]}object: {"Price": " 1000 "}

P.s. Online posts are described in the element method as follows:

Put a Key/value pair in the jsonobject. If the value is null and then the key would be removed from the jsonobject if it is
Present. If There is a previous value assigned to the key, it'll call accumulate.

Translation:

The public jsonobject element (String key, object value) places the key/value pairs inside the Jsonobject object. If the current value is null (NULL), the key is removed if the key exists. If this
Key is preceded by a value, this method calls the accumulate () method.

However, the pro-test, but not exactly, the results are not as expected on the effect. So I wonder, online about such a lot of posts, are the same, presumably direct CV Dafa, but I am very puzzled, why is not the document that the element?!

Net.sf.json-put, accumulate, element